The Plant List — A working list for all plant species

⚠ Version 1 of The Plant List has been superseded.

You should refer instead to the current version of The Plant List.

Results

4144 plant name records match your search criteria Piper. The results are below.

• Genus Piper is in the family Piperaceae. Species epithets begin with: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

The results can also be downloaded as a CSV file.

See "Status", "Confidence level", "Source" for definitions.

Name	Status	Confi­dence level	Source
Piper abalienatum Trel.	Accepted		TRO
Piper abbadianum Yunck.	Accepted		WCSP (in review)
Piper abbreviatum Opiz	Accepted		WCSP (in review)
Piper abditum Trel.	Accepted		TRO
Piper abellinum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper aberrans C.DC.	Unresolved		WCSP (in review)
Piper abraense C.DC.	Unresolved		WCSP (in review)
Piper abutilifolium (Miq.) C. DC.	Accepted		TRO
Piper abutiloides Kunth	Unresolved		WCSP (in review)
Piper acamptostachys Trel.	Unresolved		WCSP (in review)
Piper acarouanyanum C. DC.	Synonym		TRO
Piper accedens S.Moore	Unresolved		WCSP (in review)
Piper accrescens Van Heurck & Müll.Arg.	Unresolved		WCSP (in review)
Piper achiguiricum Trel.	Unresolved		TRO
Piper achoteanum Trel.	Accepted		TRO
Piper achotense Trel. & Yunck.	Unresolved		WCSP (in review)
Piper achromatolepis Trel.	Accepted		TRO
Piper achupallasense Yunck.	Accepted		TRO
Piper acre Blume	Unresolved		WCSP (in review)
Piper acreanum C. DC.	Synonym		TRO
Piper actae Trel.	Synonym		TRO
Piper aculeatum C.DC.	Unresolved		WCSP (in review)
Piper acuminatissimum C. DC.	Synonym		TRO
Piper acuminatum (Ruiz & Pav.) Pers.	Synonym		WCSP (in review)
Piper acuminatum L.	Synonym		TRO
Piper acutamentum C.DC.	Unresolved		WCSP (in review)
Piper acutibaccum C.DC.	Unresolved		WCSP (in review)
Piper acutibracteum C.DC.	Unresolved		WCSP (in review)
Piper acutifolium Ruiz & Pav.	Accepted		TRO
Piper acutifolium var. acutifolium	Accepted		TRO
Piper acutifolium var. membranaceum C. DC.	Synonym		TRO
Piper acutifolium var. subverbascifolium C. DC.	Synonym		TRO
Piper acutilimbum C.DC.	Unresolved		WCSP (in review)
Piper acutissimum Trel.	Synonym		WCSP (in review)
Piper acutissimum var. trichopus (Trel.) Yunck.	Synonym		TRO
Piper acutistigmum C.DC.	Unresolved		WCSP (in review)
Piper acutistipulum C.DC.	Unresolved		WCSP (in review)
Piper acutiusculum C. DC.	Accepted		TRO
Piper acutulum Trel.	Accepted		TRO
Piper adamatum Trel. & Standl.	Unresolved		WCSP (in review)
Piper adenandrum (Miq.) C.DC.	Accepted		WCSP (in review)
Piper adenophlebium Trel.	Synonym		TRO
Piper adenophorum (Miq.) C. DC.	Synonym		TRO
Piper admirabile Yunck.	Accepted		TRO
Piper adornatispicum Trel.	Synonym		TRO
Piper adreptum Trel.	Accepted		TRO
Piper adscendens Endl.	Unresolved		WCSP (in review)
Piper aduncifolium Trel.	Synonym		TRO
Piper aduncum L.	Accepted		WCSP (in review)
Piper aduncum var. aduncum	Accepted		TRO
Piper aduncum var. brachyarthrum (Trel.) Yunck.	Synonym		WCSP (in review)
Piper aduncum var. cordulatum (C.DC.) Yunck.	Accepted		WCSP (in review)
Piper aduncum var. laevifolium C. DC.	Synonym		TRO
Piper aegrum Trel.	Synonym		TRO
Piper aemulum Endl.	Unresolved		WCSP (in review)
Piper aequale Vahl	Accepted		WCSP (in review)
Piper aequale var. elliptico-lanceolatum C. DC.	Synonym		TRO
Piper aequale var. glanduligerum (C.DC.) Steyerm.	Synonym		WCSP (in review)
Piper aequale var. laurifolium (Trel.) Yunck.	Accepted		TRO
Piper aequale var. santa-martanum (C.DC.) Trel. & Yunck.	Synonym		WCSP (in review)
Piper aequale var. substenocarpum C. DC.	Synonym		TRO
Piper aequilaterum C. DC.	Synonym		TRO
Piper aereum Trel.	Accepted		TRO
Piper aeruginosibaccum Trel.	Synonym		TRO
Piper affectans Trel.	Synonym		TRO
Piper affictum Trel.	Accepted		TRO
Piper affine M. Martens & Galeotti	Synonym		TRO
Piper affine (Miq.) C. DC.	Synonym		TRO
Piper afflictum Trel.	Accepted		TRO
Piper afzelianum Roem. & Schult.	Synonym		TRO
Piper agellifolium Trel. & Yunck.	Unresolved		WCSP (in review)
Piper aggregatum P.J.Bergius	Synonym		WCSP (in review)
Piper agostinii Yunck.	Synonym		WCSP (in review)
Piper agostiniorum Steyerm.	Accepted		WCSP (in review)
Piper aguacalientis Trel.	Unresolved		WCSP (in review)
Piper aguadulcense Yunck.	Accepted		TRO
Piper aguilanum C. DC.	Synonym		TRO
Piper agusanense C.DC.	Unresolved		WCSP (in review)
Piper alajuelanum Trel.	Synonym		TRO
Piper alare Desv. ex Ham.	Synonym		TRO
Piper alatabaccum Trel. & Yunck.	Accepted		WCSP (in review)
Piper alatipetiolatum Yunck.	Unresolved		WCSP (in review)
Piper alatum (Ruiz & Pav.) Vahl	Synonym		WCSP (in review)
Piper albamentum C.DC.	Unresolved		WCSP (in review)
Piper albanense Yunck.	Unresolved		WCSP (in review)
Piper albert-smithii Trel. & Yunck.	Synonym		TRO
Piper alberti Trel.	Synonym		TRO
Piper albescens C. DC.	Synonym		TRO
Piper albicaule Trel.	Synonym		TRO
Piper albiciliatum Yunck.	Accepted		TRO
Piper albidiflorum C.DC.	Unresolved		WCSP (in review)
Piper albidirameum C.DC.	Unresolved		WCSP (in review)
Piper albidistigmatum C.DC.	Unresolved		WCSP (in review)
Piper albidopunctatum Blume	Unresolved		WCSP (in review)
Piper albidum Kunth	Accepted		TRO
Piper albispicum C. DC.	Synonym		TRO
Piper albogranulatum Trel.	Accepted		TRO
Piper albomaculatum D. Dietr.	Synonym		TRO
Piper albopapillatum Trel.	Accepted		TRO
Piper albopilosum Yunck.	Unresolved		WCSP (in review)
Piper albopunctatum C.DC.	Unresolved		WCSP (in review)
Piper albopunctulatissimum Trel.	Synonym		TRO
Piper albozonatum C. DC.	Accepted		TRO
Piper albuginiferum Trel.	Synonym		TRO
Piper album Vahl	Unresolved		WCSP (in review)
Piper aleyreanum C. DC.	Accepted		TRO
Piper allardii Yunck.	Accepted		TRO
Piper allatum Trel.	Synonym		TRO
Piper allenii Trel.	Synonym		TRO
Piper allisum Trel.	Synonym		TRO
Piper alluvicola C. DC.	Synonym		TRO
Piper alnoides Kunth	Accepted		TRO
Piper alpinum Sw.	Synonym		WCSP (in review)
Piper alpinum (Miq.) C. DC.	Synonym		TRO
Piper alsinoides Lam.	Unresolved		WCSP (in review)
Piper alstonii Trel.	Synonym		TRO
Piper altevaginans Trel.	Synonym		TRO
Piper alveatum Trel.	Synonym		TRO
Piper alveolatifolium Trel.	Synonym		TRO
Piper alveolatum Opiz	Accepted		TRO
Piper alwynii Callejas & Betancur	Unresolved		TRO
Piper amagarum Trel.	Synonym		TRO
Piper amalago L.	Accepted		WCSP (in review)
Piper amalago f. ceanothifolium (Kunth) Steyerm.	Synonym		TRO
Piper amalago var. ceanothifolium (Kunth) Yunck.	Synonym		TRO
Piper amalago var. medium (Jacq.) Yunck.	Synonym		WCSP (in review)
Piper amalago var. variifolia (Griseb.) Fawc. & Rendle	Accepted		TRO
Piper amazonasense Trel. & Yunck.	Synonym		WCSP (in review)
Piper amazonicum (Miq.) C.DC.	Synonym		WCSP (in review)
Piper ambiguum Salisb.	Unresolved		WCSP (in review)
Piper amboinense (Miq.) C. DC.	Accepted		TRO
Piper amboinense var. latifolium (Miq.) C. DC.	Accepted		TRO
Piper amnigaudens Trel.	Synonym		TRO
Piper amoenum Yunck.	Unresolved		WCSP (in review)
Piper amparoense Yunck.	Accepted		WCSP (in review)
Piper amphibium Trel.	Synonym		TRO
Piper amphibracteum C.DC.	Unresolved		WCSP (in review)
Piper amphioxys Trel.	Synonym		TRO
Piper amphioxys var. laurifolium Trel.	Synonym		TRO
Piper amphitrichum Trel.	Accepted		TRO
Piper amphoricarpum Trel.	Synonym		TRO
Piper amplectens (Miq.) C. DC.	Synonym		TRO
Piper amplectenticaule Trel. & Yunck.	Accepted		WCSP (in review)
Piper amplexicaule Sw.	Synonym		TRO
Piper amplexifolium Link	Unresolved		WCSP (in review)
Piper amplilimbum C.DC.	Unresolved		WCSP (in review)
Piper amplum Kunth	Accepted		TRO
Piper anastylum Trel.	Accepted		TRO
Piper andersonii C.DC.	Unresolved		WCSP (in review)
Piper andicolum Kunth	Synonym		TRO
Piper andreanum C. DC.	Accepted		TRO
Piper andreanum var. parvifolium C. DC.	Synonym		TRO
Piper andresense Trel.	Synonym		TRO
Piper andresense var. subcalvescens Trel.	Synonym		TRO
Piper androgynum C. DC.	Accepted		TRO
Piper angamarcanum C. DC.	Accepted		TRO
Piper angremondii C. DC.	Synonym		TRO
Piper anguillaespicum Trel.	Synonym		TRO
Piper angulatum (Kunth) Poir.	Synonym		WCSP (in review)
Piper angustatum (Kunth) Poir.	Synonym		WCSP (in review)
Piper angustiae Trel.	Unresolved		TRO
Piper angustifolium Ruiz & Pav. [Illegitimate]	Synonym		WCSP (in review)
Piper angustifolium Lam.	Synonym		TRO
Piper angustifolium var. cordulatum C.DC.	Synonym		WCSP (in review)
Piper angustifolium var. ossanum C. DC.	Synonym		TRO
Piper angustilimbum C.DC.	Unresolved		WCSP (in review)
Piper angustipeltatum Merr.	Unresolved		WCSP (in review)
Piper angustum Rudge ex Spreng.	Synonym		TRO
Piper anisatum Kunth	Synonym		WCSP (in review)
Piper anisitsii C.DC.	Unresolved		WCSP (in review)
Piper anisodorum Náves ex Fern.-Vill.	Unresolved		WCSP (in review)
Piper anisodorum Blanco	Unresolved		WCSP (in review)
Piper anisophyllum Trel.	Synonym		TRO
Piper anisophyllum var. granulatum Trel.	Synonym		TRO
Piper anisopleurum C.DC.	Unresolved		WCSP (in review)
Piper anisotis Hook.f.	Unresolved		WCSP (in review)
Piper anisotrichum C.DC.	Unresolved		WCSP (in review)
Piper anisumolens Blanco	Unresolved		WCSP (in review)
Piper annulatispicum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper annulatum Trel.	Synonym		TRO
Piper anomalum C.DC.	Unresolved		WCSP (in review)
Piper anonifolium (Kunth) Steud.	Accepted		WCSP (in review)
Piper anonifolium Kunth	Unresolved		TRO
Piper anonifolium (Kunth) C. DC.	Synonym		TRO
Piper anonifolium var. parkerianum (Miq.) Steyerm.	Accepted		WCSP (in review)
Piper anonifolium var. rigidulum C. DC.	Synonym		TRO
Piper anonymum Trel.	Accepted		TRO
Piper anostachyum Yunck.	Unresolved		WCSP (in review)
Piper antioquiense C.DC.	Unresolved		WCSP (in review)
Piper apertum Trel.	Synonym		TRO
Piper apertum var. nodosum Trel.	Synonym		TRO
Piper apiculatum C. DC.	Synonym		TRO
Piper apodum Trel.	Accepted		TRO
Piper apollinaris C. DC.	Synonym		TRO
Piper appendiculatum (Benth.) C. DC.	Accepted		TRO
Piper apurimacanum Trel.	Accepted		TRO
Piper apus Trel.	Accepted		TRO
Piper aquacalientis Trel.	Synonym		TRO
Piper aragonense Trel.	Synonym		TRO
Piper araguense Trel. & Yunck.	Synonym		WCSP (in review)
Piper araneatum Trel.	Accepted		TRO
Piper araquei Yunck.	Unresolved		WCSP (in review)
Piper arbelaezii Trel. & Yunck.	Accepted		WCSP (in review)
Piper arbelaezii var. subglabrirameum Yunck.	Synonym		TRO
Piper arbores-crassae Trel.	Unresolved		TRO
Piper arborescens Roxb.	Accepted		TRO
Piper arborescens var. angustilimbum Quisumb.	Synonym		TRO
Piper arboreum Aubl.	Accepted		WCSP (in review)
Piper arboreum subsp. arboreum	Accepted		TRO
Piper arboreum var. falcifolium (Trel.) Yunck.	Synonym		WCSP (in review)
Piper arboreum f. geniculata Fawc. & Rendl.	Synonym		TRO
Piper arboreum var. giganteum Trel. & Yunck.	Synonym		TRO
Piper arboreum var. hirtellum Yunck.	Accepted		WCSP (in review)
Piper arboreum var. latifolium (C.DC.) Yunck.	Synonym		WCSP (in review)
Piper arboreum subsp. stamineum (Miq.) Borhidi	Unresolved		WCSP (in review)
Piper arboreum subsp. tuberculatum (Jacq.) Tebbs	Synonym		WCSP (in review)
Piper arboricola C. DC.	Synonym		TRO
Piper arborigaudens C.DC.	Unresolved		WCSP (in review)
Piper arborisedens C.DC.	Unresolved		WCSP (in review)
Piper arbuscula Trel.	Unresolved		WCSP (in review)
Piper arcessitum Trel.	Synonym		TRO
Piper archeri Trel. & Yunck.	Synonym		TRO
Piper archidonense Trel.	Synonym		TRO
Piper arcteacuminatum Trel.	Synonym		TRO
Piper arctilimbum Trel.	Synonym		TRO
Piper arctilimbum var. allenii Trel.	Synonym		TRO
Piper arcuatum C. Presl	Synonym		TRO
Piper arduum Trel.	Accepted		TRO
Piper arenicola Trel.	Synonym		TRO
Piper areolatum (Miq.) C. DC.	Accepted		TRO
Piper arfakianum C.DC.	Unresolved		WCSP (in review)
Piper argentamentum Trel. & Yunck.	Synonym		TRO
Piper argentinum (C. DC.) Trel.	Synonym		TRO
Piper argillicola C. DC.	Synonym		TRO
Piper argyritis Ridl. ex C.DC.	Unresolved		WCSP (in review)
Piper argyroneurum Hallier f.	Unresolved		WCSP (in review)
Piper argyrophyllum Miq.	Unresolved		WCSP (in review)
Piper arieianum C.DC.	Synonym		WCSP (in review)
Piper arieianum var. chimantanum (Yunck.) Steyerm.	Synonym		WCSP (in review)
Piper arieianum var. duidaense (Trel.) Steyerm.	Synonym		WCSP (in review)
Piper arieianum var. yaracuyense (Yunck.) Steyerm.	Synonym		WCSP (in review)
Piper arifolium Miq.	Unresolved		WCSP (in review)
Piper aripoense Trel.	Unresolved		WCSP (in review)
Piper aristeguietae Yunck.	Synonym		WCSP (in review)
Piper aristolochiaefolium (Trel.) Yunck.	Accepted		TRO
Piper aristolochioides Lam.	Unresolved		WCSP (in review)
Piper aristolochiphyllum Quisumb.	Unresolved		WCSP (in review)
Piper armatum Trel. & Yunck.	Accepted		TRO
Piper arnottianum (Miq.) C. DC.	Accepted		TRO
Piper aromaticum Willd.	Synonym		WCSP (in review)
Piper arrectispicum Trel.	Accepted		TRO
Piper arreptum Trel.	Accepted		TRO
Piper artanthe C.DC.	Accepted		WCSP (in review)
Piper artanthe var. grandifolium Yunck.	Synonym		TRO
Piper arthantopse C. DC.	Accepted		TRO
Piper articulosum Trel.	Synonym		TRO
Piper arunachalensis Gajurel, P.R., P. Rethy & Y. Kumar	Accepted		TRO
Piper arundinetorum Trel.	Synonym		TRO
Piper asarifolium (Schltdl.) D.Dietr.	Synonym		WCSP (in review)
Piper ascendentispicum Trel.	Accepted		TRO
Piper asclepiadifolium Trel.	Accepted		TRO
Piper aserrianum Trel.	Synonym		TRO
Piper aspericaule Trel.	Synonym		TRO
Piper asperifolium Rich.	Synonym		WCSP (in review)
Piper asperifolium Opiz	Synonym		TRO
Piper asperifolium Ruiz & Pav.	Synonym		TRO
Piper asperilimbum C.DC.	Accepted		WCSP (in review)
Piper asperiusculum Kunth	Accepted		TRO
Piper asperrimicaule Trel.	Synonym		TRO
Piper asperulibaccum C.DC.	Unresolved		WCSP (in review)
Piper asplundii Yunck.	Accepted		TRO
Piper asterocarpum Trel.	Accepted		TRO
Piper asterostigmum Quisumb.	Unresolved		WCSP (in review)
Piper asterotrichum C. DC.	Accepted		TRO
Piper asymmetricum C. DC.	Synonym		TRO
Piper atlantidanum Trel.	Synonym		TRO
Piper atlantidanum var. sibunense Trel.	Synonym		TRO
Piper atlantidanum var. yoroense Trel.	Synonym		TRO
Piper atrichopus Trel.	Synonym		TRO
Piper atrichopus var. arborescens Trel.	Synonym		TRO
Piper atrobaccum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper atroglandulosum Tebbs	Accepted		TRO
Piper atropremnon Trel.	Unresolved		WCSP (in review)
Piper atrorameum C. DC.	Synonym		TRO
Piper atrosanguineum C.DC.	Unresolved		WCSP (in review)
Piper atrospicum C.DC.	Unresolved		WCSP (in review)
Piper attenuatamentum Trel.	Accepted		TRO
Piper attenuatum Buch.-Ham. ex Miq.	Accepted		TRO
Piper attenuatum Willd. ex Kunth	Synonym		TRO
Piper augustum Rudge	Accepted		WCSP (in review)
Piper augustum var. cocleanum (Trel.) Yunck.	Accepted		TRO
Piper aulacospermum Callejas	Unresolved		WCSP (in review)
Piper aurantiacum Wall. ex C. DC.	Synonym		TRO
Piper aurantiacum var. glabrum (Miq.) C. DC.	Unresolved		TRO
Piper aurantiacum var. hupeense C. DC.	Synonym		TRO
Piper auriculatum (Miq.) C. DC.	Accepted		TRO
Piper auriculiferum Trel.	Synonym		TRO
Piper auriculifolium Yunck.	Unresolved		WCSP (in review)
Piper auriculilaminum Yunck.	Unresolved		WCSP (in review)
Piper aurilimbum C.DC.	Unresolved		WCSP (in review)
Piper auristellanum C. DC.	Synonym		TRO
Piper auritifolium Trel.	Synonym		TRO
Piper auritilaminum Trel.	Synonym		TRO
Piper auritilimbum Trel.	Synonym		TRO
Piper auritum Kunth	Accepted		TRO
Piper auritum var. amplifolium C. DC.	Synonym		TRO
Piper auritum f. rinconense Trel.	Synonym		TRO
Piper auritum var. seemannianum (Miq.) Trel.	Synonym		TRO
Piper aurorubrum C.DC.	Unresolved		WCSP (in review)
Piper austinii Trel.	Synonym		TRO
Piper austinii var. aequilaterum Trel.	Synonym		TRO
Piper australasicum C.DC.	Unresolved		WCSP (in review)
Piper australe A.Cunn. ex Miq.	Unresolved		WCSP (in review)
Piper austrocaledonicum C.DC.	Synonym		WCSP (in review)
Piper austromexicanum Trel.	Unresolved		WCSP (in review)
Piper austrosinense Y.Q. Tseng	Accepted		TRO
Piper avanum Wall.	Unresolved		WCSP (in review)
Piper avellanum (Miq.) C.DC.	Accepted		WCSP (in review)
Piper avene Hassk.	Unresolved		WCSP (in review)
Piper awaensis M.A. Jaram. & Callejas	Unresolved		TRO
Piper azuaiense Yunck.	Accepted		TRO
Piper azupizuanum Trel.	Accepted		TRO
Piper baccans (Miq.) C.DC.	Accepted		WCSP (in review)
Piper baccans var. sancarlosianum (C.DC.) Steyerm.	Accepted		WCSP (in review)
Piper baccatum C.DC.	Unresolved		WCSP (in review)
Piper baccatum Blume	Unresolved		WCSP (in review)
Piper baclei C.DC.	Unresolved		WCSP (in review)
Piper baculiferum Trel.	Synonym		TRO
Piper baezanum C. DC.	Accepted		TRO
Piper baezense Trel.	Accepted		TRO
Piper baguionum C.DC.	Unresolved		WCSP (in review)
Piper bahianum Yunck.	Unresolved		WCSP (in review)
Piper bahiense (C. Presl) C. DC.	Accepted		TRO
Piper bajanum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper bakeri C. DC.	Unresolved		TRO
Piper bakerianum C.DC.	Unresolved		WCSP (in review)
Piper balansae C.DC.	Unresolved		WCSP (in review)
Piper balaoense C. DC.	Synonym		TRO
Piper balbisianum C.DC.	Unresolved		WCSP (in review)
Piper balsapuertanum Trel.	Accepted		TRO
Piper bambusifolium Y.Q. Tseng	Accepted		TRO
Piper banaoanum Trel.	Unresolved		WCSP (in review)
Piper bangii C.DC.	Unresolved		WCSP (in review)
Piper bangkanum C.DC.	Unresolved		WCSP (in review)
Piper banksii Miq.	Unresolved		WCSP (in review)
Piper bantamense Blume	Unresolved		WCSP (in review)
Piper baptisianum C.DC.	Unresolved		WCSP (in review)
Piper baracoanum León	Unresolved		WCSP (in review)
Piper baramense C.DC.	Unresolved		WCSP (in review)
Piper barbatum Kunth	Accepted		TRO
Piper barbatum var. andicolum (Kunth) Trel. & Yunck.	Synonym		TRO
Piper barbatum var. isernii Trel.	Synonym		TRO
Piper barberi Gamble	Unresolved		WCSP (in review)
Piper barbicuspe Trel.	Accepted		TRO
Piper barbinerve Trel.	Synonym		TRO
Piper barbirostre Trel.	Synonym		TRO
Piper barbispicum C.DC.	Unresolved		WCSP (in review)
Piper barbosanum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper barbulantherum Trel.	Accepted		TRO
Piper barbulatum C. DC.	Synonym		TRO
Piper barclayanum C.DC.	Unresolved		WCSP (in review)
Piper baricuspi Trel.	Unresolved		TRO
Piper barkleyi Yunck.	Unresolved		WCSP (in review)
Piper baronii C.DC.	Unresolved		WCSP (in review)
Piper barretoi Yunck.	Unresolved		WCSP (in review)
Piper barriosense Trel. & Standl.	Synonym		TRO
Piper bartlingianum (Miq.) C.DC.	Accepted		WCSP (in review)
Piper bartlingianum var. parimanum (Trel.) Steyerm.	Synonym		WCSP (in review)
Piper baryanum C. DC.	Synonym		TRO
Piper basellaefolium (Kunth) Poir.	Synonym		TRO
Piper basilanum C.DC.	Unresolved		WCSP (in review)
Piper basilobatum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper bathicarpum C.DC.	Unresolved		WCSP (in review)
Piper batuanum C.DC.	Unresolved		WCSP (in review)
Piper bavinum C. DC.	Synonym		TRO
Piper bayamonanum Trel.	Synonym		TRO
Piper beccarii C.DC.	Unresolved		WCSP (in review)
Piper begoniaefolium Hook. & Arn.	Unresolved		TRO
Piper begoniicolor Trel. & Yunck.	Synonym		TRO
Piper begoniicolor var. lobatum Trel. & Yunck.	Synonym		TRO
Piper begoniifolia (Blume) C. DC.	Synonym		TRO
Piper begoniifolium (Blume) Quisumb. [Illegitimate]	Synonym		WCSP (in review)
Piper begoniifolium (Blume) Hook. & Arn.	Synonym		TRO
Piper begoniiforme Yunck.	Accepted		TRO
Piper bejucalanum Trel.	Unresolved		WCSP (in review)
Piper belemense C. DC.	Synonym		TRO
Piper bellidifolium Yunck.	Accepted		TRO
Piper belloi Yunck.	Unresolved		WCSP (in review)
Piper bellum Yunck.	Unresolved		WCSP (in review)
Piper belterraense Yunck.	Unresolved		WCSP (in review)
Piper bengalense C.DC.	Unresolved		WCSP (in review)
Piper benianum Trel.	Synonym		TRO
Piper bennettianum C.DC.	Unresolved		WCSP (in review)
Piper benthamianum (Miq.) C.DC.	Synonym		WCSP (in review)
Piper bequaertii De Wild.	Synonym		TRO
Piper berembunense Chaveer. & Sudmoon	Unresolved		WCSP (in review)
Piper berlandieri C. DC.	Synonym		TRO
Piper bermejanum Trel. & Yunck.	Accepted		TRO
Piper bermudezense Trel.	Synonym		TRO
Piper bernouillii C. DC.	Unresolved		TRO
Piper berryi Steyerm.	Accepted		WCSP (in review)
Piper berteroanum C. DC.	Accepted		TRO
Piper betel Blanco [Spelling variant]	Synonym		WCSP (in review)
Piper betle L.	Accepted		WCSP (in review)
Piper betle var. densum (Blume) C. DC.	Synonym		TRO
Piper betle f. densum (Blume) Fosberg	Accepted		TRO
Piper betle var. marianum (Opiz) C. DC.	Synonym		TRO
Piper betle f. marianum (Opiz) Fosberg	Accepted		TRO
Piper betle var. psilocarpum C. DC.	Synonym		TRO
Piper betleoides C.DC.	Unresolved		WCSP (in review)
Piper betloides Chaveer. & Tanomtong	Unresolved		WCSP (in review)
Piper biauritum C. DC.	Accepted		TRO
Piper bicolor Yunck.	Synonym		TRO
Piper bidentatum Stokes	Unresolved		WCSP (in review)
Piper biformipilum Yunck.	Unresolved		TRO
Piper bigelovii Trel.	Synonym		TRO
Piper bikanum O.Schwartz	Unresolved		WCSP (in review)
Piper bilineatum Blume	Unresolved		WCSP (in review)
Piper bilobulatum C.DC.	Unresolved		WCSP (in review)
Piper biolleyi C. DC.	Accepted		TRO
Piper bipedale C.DC.	Unresolved		WCSP (in review)
Piper bipunctatum C.DC.	Unresolved		WCSP (in review)
Piper biritak Trel. & Standl.	Unresolved		WCSP (in review)
Piper birmanicum C.DC.	Unresolved		WCSP (in review)
Piper biroi K.Schum.	Unresolved		WCSP (in review)
Piper bisacuminatum Trel.	Unresolved		WCSP (in review)
Piper bisasperatum Trel.	Accepted		TRO
Piper biseriatum C. DC.	Accepted		TRO
Piper bisexuale C.DC.	Unresolved		WCSP (in review)
Piper bistigmatum C.DC.	Unresolved		WCSP (in review)
Piper biunciale Poir.	Unresolved		WCSP (in review)
Piper bivalvantherum C.DC.	Unresolved		WCSP (in review)
Piper blanchetii (Miq.) C. DC.	Accepted		TRO
Piper blancoi Merr.	Unresolved		WCSP (in review)
Piper blandum Jacq.	Synonym		WCSP (in review)
Piper blattarum Spreng.	Synonym		TRO
Piper blepharilepidum Trel.	Synonym		TRO
Piper bocasense Trel.	Synonym		TRO
Piper boconoense Trel. & Yunck.	Synonym		WCSP (in review)
Piper boehmeriifolium (Miq.) Wall. ex C. DC.	Accepted		TRO
Piper boehmeriifolium var. boehmeriifolium	Accepted		TRO
Piper boehmeriifolium var. glabricaule (C. DC.) M.G. Gilbert & N.H. Xia	Accepted		TRO
Piper boehmeriifolium var. tonkinense C. DC.	Synonym		TRO
Piper boerlagei C.DC.	Unresolved		WCSP (in review)
Piper bogotense C.DC.	Accepted		WCSP (in review)
Piper bogotense var. usaquemense Trel.	Synonym		TRO
Piper boissierianum C.DC.	Unresolved		WCSP (in review)
Piper boivinii C.DC.	Unresolved		WCSP (in review)
Piper bojonyum C.DC.	Unresolved		WCSP (in review)
Piper bolanicum Schltr. ex R.O.Gardner	Unresolved		WCSP (in review)
Piper bolivaranum Yunck.	Accepted		WCSP (in review)
Piper bolivianum C. DC.	Synonym		TRO
Piper bombycatum Noronha	Unresolved		WCSP (in review)
Piper bonii C. DC.	Accepted		TRO
Piper bonthainense C.DC.	Unresolved		WCSP (in review)
Piper bontianum C.DC.	Unresolved		WCSP (in review)
Piper boorsroae C.DC.	Unresolved		WCSP (in review)
Piper bopianum Trel.	Synonym		TRO
Piper boquetense Yunck.	Accepted		TRO
Piper boquianum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper borbonense (Miq.) C. DC.	Accepted		TRO
Piper borneense N.E.Br.	Unresolved		WCSP (in review)
Piper borucanum C. DC.	Synonym		TRO
Piper bosnicanum C.DC.	Accepted		WCSP (in review)
Piper botrytes Vahl	Unresolved		WCSP (in review)
Piper botterii C. DC.	Accepted		TRO
Piper boucheanum C.DC.	Unresolved		WCSP (in review)
Piper bourgeaui C.DC.	Unresolved		WCSP (in review)
Piper bowiei Yunck.	Unresolved		WCSP (in review)
Piper brachipilum Yunck.	Accepted		TRO
Piper brachistopodium C. DC.	Synonym		TRO
Piper brachypetiolatum Yunck.	Unresolved		WCSP (in review)
Piper brachyphyllum Willd.	Unresolved		WCSP (in review)
Piper brachypodon (Benth.) C. DC.	Accepted		TRO
Piper brachypodon f. hirtella C. DC.	Synonym		TRO
Piper brachypus Trel.	Unresolved		WCSP (in review)
Piper brachyrachis C.H.Wright	Unresolved		WCSP (in review)
Piper brachystachyon Vahl	Unresolved		WCSP (in review)
Piper brachystachyum Vahl	Synonym		TRO
Piper brachystachyum Wall. ex Hook. f.	Synonym		TRO
Piper brachystachyum C. DC.	Synonym		TRO
Piper brachystylum Trel.	Accepted		TRO
Piper brachytrichum Trel.	Accepted		TRO
Piper bracteatum Thomps.	Synonym		TRO
Piper bradei Yunck.	Unresolved		WCSP (in review)
Piper braggmanense Trel.	Unresolved		TRO
Piper brasiliense C. DC.	Accepted		TRO
Piper brassii Trel.	Unresolved		WCSP (in review)
Piper bredemeyeri J.Jacq.	Accepted		WCSP (in review)
Piper bredemeyeri var. angustifolium Trel. & Yunck.	Synonym		WCSP (in review)
Piper bredemeyeri var. flexuosum (Jacq.) Trel. & Yunck.	Synonym		TRO
Piper brenesii C. DC.	Synonym		TRO
Piper breve C. DC. ex Trel.	Synonym		TRO
Piper breve var. bellae-vistae Trel.	Synonym		TRO
Piper breve var. divaricatum Trel.	Synonym		TRO
Piper breve var. pallidineurum Trel.	Synonym		TRO
Piper breve var. pseudodumeticola Trel.	Synonym		TRO
Piper breve var. pseudofatoanum Trel.	Synonym		TRO
Piper brevesanum Yunck.	Accepted		WCSP (in review)
Piper brevestrigillosum Trel.	Accepted		TRO
Piper breviamentum C.DC.	Unresolved		WCSP (in review)
Piper breviantherum C.DC.	Unresolved		WCSP (in review)
Piper brevicaule C. DC.	Synonym		TRO
Piper brevicuspe Merr.	Unresolved		WCSP (in review)
Piper brevifollum C.DC.	Unresolved		WCSP (in review)
Piper brevilimbum C.DC.	Unresolved		WCSP (in review)
Piper brevipedicellatum Bornst.	Unresolved		WCSP (in review)
Piper brevipedunculatum C.DC.	Unresolved		WCSP (in review)
Piper brevipedunculum Trel.	Synonym		TRO
Piper brevipes C.DC.	Unresolved		WCSP (in review)
Piper brevispicatum Opiz	Synonym		TRO
Piper brevispicum C. DC.	Accepted		TRO
Piper brevistigmum C.DC.	Unresolved		WCSP (in review)
Piper brevistipatum C.DC.	Unresolved		WCSP (in review)
Piper brevistylum C. DC.	Synonym		TRO
Piper brisasense Yunck.	Unresolved		WCSP (in review)
Piper brittonorum Trel.	Unresolved		WCSP (in review)
Piper broadwayi C.DC.	Unresolved		WCSP (in review)
Piper brongniartii (Miq.) C. DC.	Accepted		TRO
Piper brownsbergense Yunck.	Unresolved		WCSP (in review)
Piper brujoense Trel. & Standl.	Synonym		TRO
Piper bryogetum C. DC.	Synonym		TRO
Piper buchii Urb.	Unresolved		WCSP (in review)
Piper buchtienii C. DC.	Synonym		TRO
Piper buchtienii var. charopampanum (C. DC.) Yunck.	Synonym		TRO
Piper bullatifolium Sodiro	Accepted		TRO
Piper bullatilimbum Pilg.	Unresolved		WCSP (in review)
Piper bullatum C.DC.	Unresolved		WCSP (in review)
Piper bullatum Vahl	Unresolved		WCSP (in review)
Piper bullosum C. DC.	Accepted		TRO
Piper bullulaefolium Trel.	Synonym		TRO
Piper bullulatum M.A.Jaram.	Unresolved		WCSP (in review)
Piper burenii C.DC.	Unresolved		WCSP (in review)
Piper burkillii Ridl.	Unresolved		WCSP (in review)
Piper buruanum Miq.	Unresolved		WCSP (in review)
Piper cabadbaranum C.DC.	Unresolved		WCSP (in review)
Piper cabagranum C. DC.	Synonym		TRO
Piper cabaianum Trel.	Unresolved		WCSP (in review)
Piper caballocochanum Trel.	Accepted		TRO
Piper cabellense C.DC.	Synonym		WCSP (in review)
Piper cabralanum C.DC.	Unresolved		WCSP (in review)
Piper cachimboense Yunck.	Unresolved		WCSP (in review)
Piper cacuminum C.DC.	Unresolved		WCSP (in review)
Piper cadenaensis Tebbs	Unresolved		TRO
Piper caducibracteum C.DC.	Unresolved		WCSP (in review)
Piper caeruleifolium Trel.	Synonym		TRO
Piper cagayanense C.DC.	Unresolved		WCSP (in review)
Piper cahuapanasense Trel.	Synonym		TRO
Piper cajamarcanum Yunck.	Accepted		TRO
Piper cajambrense Trel. & Yunck.	Unresolved		WCSP (in review)
Piper caladiifolium (Miq.) C. DC.	Accepted		TRO
Piper calamistratum Trel.	Accepted		TRO
Piper calanyanum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper calcaratum C. DC.	Synonym		TRO
Piper calcariformis Tebbs	Accepted		TRO
Piper calceolarium C. DC.	Accepted		TRO
Piper calceolarium var. magnifolium (C. DC.) Trel. & Yunck.	Synonym		TRO
Piper calceolatum C. DC.	Synonym		TRO
Piper calceolatum var. magnifolium C. DC.	Synonym		TRO
Piper calciseligens Trel. ex Stehlé	Unresolved		WCSP (in review)
Piper caldasianum (Miq.) Yunck.	Accepted		TRO
Piper caldense C. DC.	Accepted		TRO
Piper caledonianum C. DC.	Synonym		TRO
Piper caliendriferum Trel.	Unresolved		WCSP (in review)
Piper californicum C. Presl ex Opiz	Synonym		TRO
Piper callcanense Trel.	Accepted		TRO
Piper callibracteum C. DC.	Synonym		TRO
Piper callosum Ruiz & Pav.	Accepted		TRO
Piper callosum var. franciscoanum C. DC.	Synonym		TRO
Piper calocoma (Miq.) C. DC.	Synonym		TRO
Piper calophyllum C.DC.	Unresolved		WCSP (in review)
Piper calvescens Trel.	Synonym		TRO
Piper calvescens var. aguanum Trel.	Synonym		TRO
Piper calvescens var. cangrejalense Trel.	Synonym		TRO
Piper calvescens var. pedunculatum Trel.	Synonym		TRO
Piper calvescens var. potrerillosense Trel.	Synonym		TRO
Piper calvescentinerve Trel.	Accepted		TRO
Piper calvibaccum Trel.	Accepted		TRO
Piper calvifolium C.DC.	Unresolved		WCSP (in review)
Piper calvilimbum C.DC.	Unresolved		WCSP (in review)
Piper calvirameum C. DC.	Synonym		TRO
Piper cambessedesii (Miq.) C. DC.	Accepted		TRO
Piper cambessedesii var. opulifolium (Miq.) C. DC.	Accepted		TRO
Piper cambodianum C.DC.	Unresolved		WCSP (in review)
Piper camiloi Trel. & Yunck.	Accepted		TRO
Piper camiloi var. glabratum Yunck.	Synonym		TRO
Piper campanum Yunck.	Accepted		TRO
Piper camphoriferum C. DC.	Accepted		TRO
Piper campii Yunck.	Accepted		TRO
Piper camptostachys Urb.	Unresolved		WCSP (in review)
Piper canaense Standl.	Synonym		TRO
Piper canaliculatum Klotzsch ex Miq.	Unresolved		WCSP (in review)
Piper canaliculatum Opiz	Unresolved		WCSP (in review)
Piper canaliculum Tebbs	Unresolved		WCSP (in review)
Piper canastrense E.F.Guim. & Carv.-Silva	Unresolved		WCSP (in review)
Piper canavillosum Steyerm.	Accepted		WCSP (in review)
Piper candelarianum C. DC.	Synonym		TRO
Piper candelarianum var. latifolium C. DC.	Synonym		TRO
Piper candelarianum var. pedroanum Trel.	Synonym		TRO
Piper candelarianum var. sepium (C. DC.) Trel.	Synonym		TRO
Piper candelarium C.DC.	Unresolved		WCSP (in review)
Piper candelosum C.DC.	Unresolved		WCSP (in review)
Piper candicans Sodiro	Synonym		TRO
Piper candidum Blume	Unresolved		WCSP (in review)
Piper candollei Sodiro	Accepted		TRO
Piper canelosense Trel. & Yunck.	Synonym		TRO
Piper canescenticaule Trel.	Accepted		TRO
Piper canescenticaule var. canescenticaule	Synonym		TRO
Piper canescenticaule var. expansum Trel.	Synonym		TRO
Piper caninum Blume	Accepted		WCSP (in review)
Piper canyazasense Trel.	Synonym		TRO
Piper capacibracteum Trel.	Synonym		TRO
Piper caparonum C. DC.	Synonym		TRO
Piper capense L.f.	Accepted		WCSP (in review)
Piper capillipes Trel. & Yunck.	Accepted		TRO
Piper capillistipes Trel.	Accepted		TRO
Piper capitarianum Yunck.	Accepted		WCSP (in review)
Piper capitellatum C.DC.	Unresolved		WCSP (in review)
Piper captum Trel.	Synonym		TRO
Piper caquetanum Yunck.	Unresolved		WCSP (in review)
Piper carabobense C.DC.	Synonym		WCSP (in review)
Piper caracasanum Bredem. ex Link	Accepted		WCSP (in review)
Piper caracasanum Opiz	Synonym		TRO
Piper caracasanum var. firmius C.DC.	Synonym		WCSP (in review)
Piper caracolanum C.DC.	Unresolved		WCSP (in review)
Piper cararense Trel. & Yunck.	Accepted		TRO
Piper carboneranum Yunck.	Synonym		WCSP (in review)
Piper cardenasii Trel.	Synonym		TRO
Piper cardiophyllum C.DC.	Unresolved		WCSP (in review)
Piper caripense Kunth	Synonym		WCSP (in review)
Piper carizalanum C.DC.	Unresolved		WCSP (in review)
Piper carlosii Trel. & Yunck.	Unresolved		WCSP (in review)
Piper carminis Trel.	Synonym		TRO
Piper carnibracteum C.DC.	Unresolved		WCSP (in review)
Piper carniconnectivum C.DC.	Unresolved		WCSP (in review)
Piper carniovarium C.DC.	Unresolved		WCSP (in review)
Piper carnistigmum C.DC.	Unresolved		WCSP (in review)
Piper carnistilum C.DC.	Unresolved		WCSP (in review)
Piper carnosicaule Trel.	Synonym		TRO
Piper carolinanum Trel.	Synonym		TRO
Piper carolinense Hosok.	Unresolved		WCSP (in review)
Piper carpapatanum Trel.	Synonym		TRO
Piper carpinifolium (C. Presl) C. DC.	Accepted		TRO
Piper carpinteranum C. DC.	Accepted		TRO
Piper carpunya Ruiz & Pav.	Accepted		TRO
Piper carpupija Pers.	Unresolved		WCSP (in review)
Piper carrapanum Trel.	Accepted		TRO
Piper carrapanum var. lancifolium Trel.	Synonym		TRO
Piper carrilloanum C.DC.	Accepted		WCSP (in review)
Piper cartagoanum C. DC.	Synonym		TRO
Piper casapiense (Miq.) C. DC.	Accepted		TRO
Piper cascajalanum C. DC.	Synonym		TRO
Piper cashmirianum Hemsl.	Unresolved		WCSP (in review)
Piper casimirianum Hemsl.	Synonym		TRO
Piper casitense Trel.	Synonym		TRO
Piper cassinoides Opiz	Accepted		TRO
Piper casteloense Yunck.	Unresolved		WCSP (in review)
Piper castroanum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper catacryptum Trel.	Synonym		TRO
Piper catalinianum Trel.	Synonym		TRO
Piper catalpaefolium Kunth	Synonym		TRO
Piper cataractarum Trel.	Synonym		TRO
Piper cathayanum M.G. Gilbert & N.H. Xia	Accepted		TRO
Piper cativalense Trel.	Accepted		TRO
Piper catripense Yunck.	Synonym		TRO
Piper catubigense Merr.	Unresolved		WCSP (in review)
Piper catucheanum Trel. & Yunck.	Synonym		TRO
Piper caucaense Yunck.	Accepted		TRO
Piper caucasanum Bredemeyer	Unresolved		TRO
Piper caudatifolium Trel.	Synonym		TRO
Piper caudatum Vahl	Synonym		WCSP (in review)
Piper caudefactum Trel. & Yunck.	Synonym		TRO
Piper caudilimbum C.DC.	Unresolved		WCSP (in review)
Piper cauranum Trel. ex Ll.Williams [Invalid]	Synonym		WCSP (in review)
Piper cavalcantei Yunck.	Unresolved		WCSP (in review)
Piper cavendishioides Trel. & Yunck.	Accepted		TRO
Piper cayoense Trel.	Synonym		TRO
Piper ceanothifolium Kunth	Synonym		TRO
Piper ceibense C. DC.	Synonym		TRO
Piper cejanum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper celatipetiolum Trel.	Synonym		TRO
Piper celatipetiolum var. brenesii Trel.	Synonym		TRO
Piper celebicum Blume	Unresolved		WCSP (in review)
Piper celer Trel.	Accepted		TRO
Piper celsum Trel.	Accepted		TRO
Piper celtidifolium Kunth	Synonym		WCSP (in review)
Piper celtidiforme Opiz	Accepted		WCSP (in review)
Piper cenocladum C. DC.	Accepted		TRO
Piper centroense Trel. & Yunck.	Unresolved		WCSP (in review)
Piper ceramicum (Miq.) C. DC.	Accepted		TRO
Piper cercidiphyllum Trel.	Synonym		TRO
Piper cernuum Vell.	Accepted		WCSP (in review)
Piper cernuum var. araguense (Trel. & Yunck.) Steyerm.	Accepted		WCSP (in review)
Piper cernuum var. biformipilum Yunck.	Synonym		TRO
Piper cernuum var. glabricaule Yunck.	Synonym		TRO
Piper cernuum var. perlongispicum (Yunck.) Steyerm.	Accepted		WCSP (in review)
Piper cerro-puntoense Trel.	Synonym		TRO
Piper cerronianum Steyerm.	Accepted		WCSP (in review)
Piper certeguiense Trel. & Yunck.	Unresolved		WCSP (in review)
Piper ceylanicum C.DC.	Unresolved		WCSP (in review)
Piper chaba Hunter	Synonym		TRO
Piper chagresianum Trel.	Synonym		TRO
Piper chairecoides C. DC.	Unresolved		TRO
Piper chalhuapuquianum Trel.	Accepted		TRO
Piper challuapuquianum Trel.	Unresolved		WCSP (in review)
Piper chamissonis Steud.	Accepted		TRO
Piper chamissonis (Miq.) Steud. ex C. DC.	Unresolved		TRO
Piper chamissonis var. rubellibracteatum C. DC.	Synonym		TRO
Piper chanchamayanum Trel.	Accepted		TRO
Piper chandocanum C.DC.	Unresolved		WCSP (in review)
Piper chanekii Trel.	Synonym		TRO
Piper changuinolanum Trel.	Accepted		TRO
Piper charopampanum C. DC.	Synonym		TRO
Piper chaudocanum C. DC.	Accepted		TRO
Piper chavicoide (Miq.) C. DC.	Accepted		TRO
Piper chawya Buch.-Ham.	Unresolved		WCSP (in review)
Piper chelseanum Roem. & Schult.	Unresolved		WCSP (in review)
Piper cheyennense Trel. & Standl.	Synonym		TRO
Piper chiadoense Yunck.	Unresolved		WCSP (in review)
Piper chichankanabanum Trel.	Synonym		TRO
Piper chilense C.DC.	Unresolved		WCSP (in review)
Piper chimantanum Yunck.	Synonym		WCSP (in review)
Piper chimborazoense Yunck.	Accepted		TRO
Piper chimonanthifolium Kunth	Unresolved		WCSP (in review)
Piper chinantlense M. Martens & Galeotti	Accepted		TRO
Piper chinense Miq.	Accepted		TRO
Piper chiquihuitense Trel. & Standl.	Unresolved		WCSP (in review)
Piper chiriquinum C. DC.	Synonym		TRO
Piper chirripoense C. DC.	Synonym		TRO
Piper chlorocarpum C.DC.	Unresolved		WCSP (in review)
Piper chlorostachyum C.DC.	Unresolved		WCSP (in review)
Piper christyi C.DC.	Unresolved		WCSP (in review)
Piper chromatolepis Trel.	Accepted		TRO
Piper chrysolepidum Trel.	Unresolved		WCSP (in review)
Piper chrysoneurum Trel.	Accepted		TRO
Piper chrysostachyum C. DC.	Accepted		TRO
Piper chuarense M.A.Jaram. & Callejas	Unresolved		WCSP (in review)
Piper chumboense Yunck.	Unresolved		WCSP (in review)
Piper churruyacoanum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper churumayu Ruiz & Pav.	Accepted		TRO
Piper chuvya Miq.	Unresolved		WCSP (in review)
Piper chuvya Hunter ex C.DC.	Unresolved		WCSP (in review)
Piper cicatriculosum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper cihuatlanense Bornst.	Unresolved		WCSP (in review)
Piper ciliaris C. DC.	Unresolved		TRO
Piper ciliatifolium Trel.	Synonym		TRO
Piper ciliatum (Kunth) Poir.	Synonym		TRO
Piper cilibracteum C.DC.	Unresolved		WCSP (in review)
Piper cililimbum Yunck.	Accepted		WCSP (in review)
Piper ciliomarginatum Görts & Christenh.	Unresolved		WCSP (in review)
Piper cincinnatum Trel.	Synonym		TRO
Piper cinerascens C.DC. ex Micheli	Unresolved		WCSP (in review)
Piper cinereocaule C.DC.	Unresolved		WCSP (in review)
Piper cinereonervosum Trel.	Synonym		TRO
Piper cinereoramulum Trel.	Synonym		TRO
Piper cinereum C. DC.	Accepted		TRO
Piper cingens C. DC.	Accepted		TRO
Piper ciniflonis Trel.	Accepted		TRO
Piper circinnatum (Link) Schult.	Synonym		WCSP (in review)
Piper circulare Desf. ex C. DC.	Synonym		TRO
Piper circumspectantis Trel.	Synonym		TRO
Piper cirratum Trel.	Accepted		TRO
Piper cisnerosense Trel. & Yunck.	Unresolved		WCSP (in review)
Piper cispontinum Trel.	Accepted		TRO
Piper citrifolium Lam.	Synonym		TRO
Piper citrifolium var. cookii C. DC.	Synonym		TRO
Piper citrifolium var. panamense (C. DC.) C. DC.	Synonym		TRO
Piper citrifolium var. parkerianum (Miq.) Trel. & Yunck.	Synonym		WCSP (in review)
Piper clarkei C.DC.	Unresolved		WCSP (in review)
Piper clathratum C. DC.	Accepted		TRO
Piper claudicans Trel.	Synonym		TRO
Piper claudii C. DC.	Accepted		TRO
Piper claussenianum (Miq.) C. DC.	Accepted		TRO
Piper clavibracteum C.DC.	Unresolved		WCSP (in review)
Piper clavuliger Trel.	Synonym		TRO
Piper clavuligerum Trel.	Unresolved		WCSP (in review)
Piper clavulispicum Trel.	Synonym		TRO
Piper clemensiae C.DC.	Unresolved		WCSP (in review)
Piper clementis León	Unresolved		WCSP (in review)
Piper clethristachyum Rich.	Synonym		TRO
Piper clivicola Standl. & L.O. Williams	Synonym		TRO
Piper clusii (Miq.) C. DC.	Accepted		TRO
Piper clusiifolium Jacq.	Synonym		TRO
Piper clypeatum Wall.	Unresolved		WCSP (in review)
Piper coactaepilum Trel.	Synonym		TRO
Piper coactile Ridl.	Unresolved		WCSP (in review)
Piper coactoris Trel.	Synonym		TRO
Piper coarctatum Trel.	Synonym		TRO
Piper coariense Yunck.	Unresolved		WCSP (in review)
Piper cobanense Trel.	Synonym		TRO
Piper cobanense var. sarculatum Trel.	Synonym		TRO
Piper cobarianum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper coccoloboides Kunth	Synonym		TRO
Piper coccoloboides (Kunth) Kunth ex C. DC.	Accepted		TRO
Piper cocherense Trel.	Synonym		TRO
Piper cochleatum Sodiro	Synonym		TRO
Piper cocornanum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper cocquericotense Trel.	Synonym		TRO
Piper coeloneurum Diels	Accepted		TRO
Piper cogolloi Callejas	Unresolved		TRO
Piper coilostachyum C. DC.	Accepted		TRO
Piper cojimaranum Trel.	Unresolved		WCSP (in review)
Piper colaphitolerans Trel.	Synonym		TRO
Piper colemanense Trel.	Synonym		TRO
Piper colipanum C. DC.	Accepted		TRO
Piper colligatispicum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper collinum C.DC.	Unresolved		WCSP (in review)
Piper collinum var. flagellicuspe Trel.	Synonym		TRO
Piper colombianum C. DC.	Synonym		TRO
Piper colon-insulae Trel.	Accepted		TRO
Piper colonense C. DC.	Accepted		TRO
Piper colonum C.Presl	Unresolved		WCSP (in review)
Piper coloratum (Kunth) Poir.	Synonym		TRO
Piper colotlipanense Bornst.	Unresolved		WCSP (in review)
Piper colubrinum Link	Synonym		WCSP (in review)
Piper colubrinum (Link ex Kunth) Link ex C. DC.	Synonym		TRO
Piper colubrinum var. adenophyllum (Miq.) C. DC.	Synonym		TRO
Piper comasense Trel.	Accepted		TRO
Piper comatum Trel.	Synonym		TRO
Piper comayaguanum Trel. ex Yunck.	Synonym		TRO
Piper commutatum Steud.	Accepted		TRO
Piper compactum Trel.	Synonym		TRO
Piper comptonii S.Moore	Unresolved		WCSP (in review)
Piper concavum (Ruiz & Pav.) Vahl	Synonym		TRO
Piper concepcionis Trel.	Synonym		TRO
Piper conceptum Trel.	Synonym		TRO
Piper concinnatoris Yunck.	Synonym		TRO
Piper concinnifolium Trel.	Synonym		TRO
Piper concinnum Haw.	Synonym		TRO
Piper concinnum (Miq.) C. DC.	Synonym		TRO
Piper concinnum var. trinitense C. DC.	Synonym		TRO
Piper concretiflorum C. DC.	Accepted		TRO
Piper conditum Trel.	Accepted		TRO
Piper condotoense Trel. & Yunck.	Unresolved		WCSP (in review)
Piper conejoense Trel. & Yunck.	Synonym		TRO
Piper confertinodum (Trel. & Yunck.) M.A. Jaram. & Callejas	Accepted		TRO
Piper confertinodum (Trel. & Yunck.) Tebbs	Synonym		TRO
Piper confusionis Trel.	Synonym		TRO
Piper confusum C.DC.	Unresolved		WCSP (in review)
Piper congestum Poir.	Unresolved		WCSP (in review)
Piper conibaccum C.DC.	Unresolved		WCSP (in review)
Piper conispicum Trel.	Accepted		TRO
Piper conjugatum Poir.	Unresolved		WCSP (in review)
Piper conquistanum Yunck.	Unresolved		WCSP (in review)
Piper consanguineum (Kunth) Steud.	Accepted		WCSP (in review)
Piper consanguineum (Kunth) Trel. & Yunck.	Synonym		TRO
Piper consanguineum Kunth	Unresolved		TRO
Piper consanguineum (Kunth) Kunth ex C. DC.	Synonym		TRO
Piper conscendens Trel.	Synonym		TRO
Piper consociatum C.DC.	Unresolved		WCSP (in review)
Piper constanzanum Urb.	Unresolved		WCSP (in review)
Piper constipatispicum Trel.	Accepted		TRO
Piper constipatispicum var. constipatispicum	Synonym		TRO
Piper constipatispicum var. lanosum Trel.	Synonym		TRO
Piper constipatispicum var. tonsum Trel.	Synonym		TRO
Piper contamanum Trel.	Synonym		TRO
Piper controversum Steud.	Accepted		TRO
Piper convallariodorum C. DC.	Synonym		TRO
Piper conversum Trel.	Synonym		TRO
Piper convexum Blume	Unresolved		WCSP (in review)
Piper cookii Trel.	Synonym		TRO
Piper cooperi Yunck.	Synonym		TRO
Piper copacabanense Trel.	Synonym		TRO
Piper copelandii C.DC.	Unresolved		WCSP (in review)
Piper copeyanum (C. DC.) Trel.	Synonym		TRO
Piper coralfalgense C.DC.	Unresolved		WCSP (in review)
Piper corcovadense C.DC.	Unresolved		WCSP (in review)
Piper corcovadensis (Miq.) C. DC.	Accepted		TRO
Piper cordatilimbum Quisumb.	Unresolved		WCSP (in review)
Piper cordatum C. DC.	Accepted		TRO
Piper cordifolium Sw.	Unresolved		WCSP (in review)
Piper cordifolium Sessé & Moc.	Unresolved		WCSP (in review)
Piper cordiforme Steyerm.	Accepted		WCSP (in review)
Piper cordilimbum C. DC.	Accepted		TRO
Piper cordillerianum C. DC.	Accepted		TRO
Piper cordoncillo Trel.	Unresolved		WCSP (in review)
Piper cordovanum C. DC.	Accepted		TRO
Piper cordulatum C. DC.	Accepted		TRO
Piper cordulatum var. granulatum Trel.	Synonym		TRO
Piper coriaceilimbum C.DC.	Unresolved		WCSP (in review)
Piper coriaceum Vahl	Unresolved		WCSP (in review)
Piper corintoananum Yunck.	Accepted		WCSP (in review)
Piper corintoanum Yunck.	Unresolved		TRO
Piper cornifolium Kunth	Accepted		TRO
Piper cornilimbum C.DC.	Unresolved		WCSP (in review)
Piper coronatibracteum Trel.	Synonym		TRO
Piper corozalanum Trel.	Synonym		TRO
Piper corpulentispicum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper correptum Trel.	Synonym		TRO
Piper corrugatum Kuntze	Accepted		TRO
Piper cortescabrum Trel.	Unresolved		WCSP (in review)
Piper coruscans Kunth	Accepted		WCSP (in review)
Piper coruscans var. membranaceum (C.DC.) Steyerm.	Synonym		WCSP (in review)
Piper corylifolium Kunth	Synonym		TRO
Piper corylistachyon (Miq.) C. DC.	Accepted		TRO
Piper corylistachyopse Trel.	Unresolved		TRO
Piper costaricense C. DC.	Synonym		TRO
Piper costatum C. DC.	Accepted		TRO
Piper costulatum C.DC.	Unresolved		WCSP (in review)
Piper cowanii (Yunck.) Yunck.	Accepted		TRO
Piper coyolesense Trel.	Synonym		TRO
Piper crassamentum Trel.	Synonym		TRO
Piper crassicaule Trel.	Synonym		TRO
Piper crassifolium (Miq.) C. DC.	Synonym		TRO
Piper crassilimbum C.DC.	Unresolved		WCSP (in review)
Piper crassinervium Kunth	Accepted		WCSP (in review)
Piper crassinervium var. crassinervium	Accepted		TRO
Piper crassinervium var. hartwegianum C. DC.	Synonym		TRO
Piper crassinervium var. tocotanum (C.DC.) Yunck.	Synonym		WCSP (in review)
Piper crassinodum C.DC.	Unresolved		WCSP (in review)
Piper crassipedunculum Yunck.	Unresolved		WCSP (in review)
Piper crassipes Korth. ex C.DC.	Unresolved		WCSP (in review)
Piper crassispicatum Opiz	Accepted		TRO
Piper crassistilum Yunck.	Accepted		WCSP (in review)
Piper crassistipes C.DC.	Unresolved		WCSP (in review)
Piper crassum Vell. [Illegitimate]	Synonym		WCSP (in review)
Piper crebrinerve Willd. ex Link	Unresolved		WCSP (in review)
Piper crebrinode Willd. ex Kunth	Synonym		TRO
Piper crebrinodum C.DC.	Accepted		WCSP (in review)
Piper crenatifolium Trel. & Yunck.	Unresolved		WCSP (in review)
Piper crenulatibracteum C.DC.	Unresolved		WCSP (in review)
Piper crenulatum Steyerm.	Accepted		WCSP (in review)
Piper cricamolense Trel.	Synonym		TRO
Piper criniovarium Yunck.	Unresolved		WCSP (in review)
Piper crispans Trel.	Synonym		TRO
Piper crispatimargine Trel.	Synonym		TRO
Piper cristalinanum Trel. & Yunck.	Synonym		TRO
Piper cristicola Trel. ex Yunck.	Synonym		TRO
Piper cristinanum Trel. & Standl.	Unresolved		WCSP (in review)
Piper crocatum Ruiz & Pav.	Accepted		TRO
Piper cryptocarpum Trel. & Yunck.	Synonym		TRO
Piper cryptopodon C. DC.	Accepted		TRO
Piper crystallinum Vahl	Synonym		TRO
Piper cuasianum Standl.	Synonym		TRO
Piper cuatrecasasii Trel.	Synonym		TRO
Piper cubataonum C.DC.	Unresolved		WCSP (in review)
Piper cubeba Bojer	Unresolved		WCSP (in review)
Piper cubeba L.f.	Unresolved		WCSP (in review)
Piper cubeba Vahl	Unresolved		WCSP (in review)
Piper cubense C.DC.	Unresolved		WCSP (in review)
Piper cubilquitzianum C. DC.	Synonym		TRO
Piper cuernavacanum C. DC.	Synonym		TRO
Piper cufodontii Trel.	Synonym		TRO
Piper cujabanum Silva Manso ex Miq.	Unresolved		WCSP (in review)
Piper culebranum C. DC.	Synonym		TRO
Piper cumanense Kunth	Accepted		WCSP (in review)
Piper cumaralense C.DC.	Accepted		WCSP (in review)
Piper cumbasonum C. DC.	Accepted		TRO
Piper cumbotianum C.DC.	Accepted		WCSP (in review)
Piper cumbricola Trel.	Synonym		TRO
Piper cumbricola var. montevagum Trel.	Synonym		TRO
Piper cumingianum Miq.	Unresolved		WCSP (in review)
Piper cundinamarcanum Trel. [Invalid]	Synonym		WCSP (in review)
Piper cuneifolium Jacq.	Synonym		TRO
Piper cuniculorum Trel. & Yunck.	Accepted		TRO
Piper cunninghamii Yunck.	Unresolved		WCSP (in review)
Piper cupreatum Trel.	Unresolved		WCSP (in review)
Piper curridabatanum Trel.	Synonym		TRO
Piper curtipedunculum C. DC.	Synonym		TRO
Piper curtipetiolum C.DC.	Unresolved		WCSP (in review)
Piper curtirachis W.C. Burger	Accepted		TRO
Piper curtisii C.DC.	Unresolved		WCSP (in review)
Piper curtispicum C. DC.	Accepted		TRO
Piper curtistipes C.DC.	Unresolved		WCSP (in review)
Piper curumaya D.Dietr.	Unresolved		WCSP (in review)
Piper curvamentum Ruiz & Pav.	Unresolved		TRO
Piper curvatipes Trel.	Unresolved		WCSP (in review)
Piper curvatum Ruiz & Pav.	Accepted		TRO
Piper curvinervium Callejas & Betancur	Unresolved		WCSP (in review)
Piper curvipilum Trel.	Unresolved		WCSP (in review)
Piper cuspidatispicum Trel.	Unresolved		TRO
Piper cuspidatum Ham.	Unresolved		WCSP (in review)
Piper cuspidibracteatum Yunck.	Unresolved		WCSP (in review)
Piper cuspidilimbum C. DC.	Accepted		TRO
Piper cuspidispicum Trel.	Accepted		TRO
Piper cutucuense Yunck.	Accepted		TRO
Piper cuyabanum C.DC.	Unresolved		WCSP (in review)
Piper cuyunianum Steyerm.	Accepted		WCSP (in review)
Piper cyanophyllum Trel.	Synonym		TRO
Piper cyclophyllum Trel.	Synonym		TRO
Piper cyclopllyllum Trel.	Unresolved		WCSP (in review)
Piper cyphophyllopse Trel. & Yunck.	Accepted		TRO
Piper cyphophyllum C. DC.	Synonym		TRO
Piper cyprium Trel. & Yunck.	Unresolved		WCSP (in review)
Piper cyrtopodon C. DC.	Accepted		TRO
Piper cyrtopodum (Miq.) C.DC.	Unresolved		WCSP (in review)
Piper cyrtostachys Ridl.	Unresolved		WCSP (in review)
Piper dactylostigmum Yunck.	Unresolved		WCSP (in review)
Piper daedalum Trel.	Accepted		TRO
Piper dagamiense C.DC.	Unresolved		WCSP (in review)
Piper dagatpanum C.DC.	Unresolved		WCSP (in review)
Piper daguanum C. DC.	Accepted		TRO
Piper damazii C.DC.	Unresolved		WCSP (in review)
Piper damiaoshanense Y.Q. Tseng	Accepted		TRO
Piper daniel-gonzalezii Trel.	Unresolved		WCSP (in review)
Piper darienense C.DC.	Accepted		WCSP (in review)
Piper darienense var. tricuspe (Miq.) Trel.	Synonym		TRO
Piper dariense C. DC.	Synonym		TRO
Piper dasyoura (Miq.) C. DC.	Accepted		TRO
Piper dasypodum (Miq.) C. DC.	Accepted		TRO
Piper dasypogon C. DC.	Synonym		TRO
Piper davaoense C.DC.	Unresolved		WCSP (in review)
Piper davidianum C. DC.	Synonym		TRO
Piper davidsonii Yunck.	Accepted		TRO
Piper dawsonii Trel.	Synonym		TRO
Piper deamii Trel.	Unresolved		WCSP (in review)
Piper deamii var. yojoanum Trel.	Synonym		TRO
Piper debile C. DC.	Synonym		TRO
Piper debilicaule Trel. & Yunck.	Synonym		TRO
Piper decipiens (Miq.) C. DC.	Accepted		TRO
Piper decorticans Trel. & Yunck.	Synonym		TRO
Piper decrescens (Miq.) C. DC.	Synonym		TRO
Piper decrescens var. ovatum C. DC.	Synonym		TRO
Piper decumanum Aubl.	Synonym		TRO
Piper decurrens C. DC.	Accepted		TRO
Piper dedititium Trel.	Synonym		TRO
Piper deductum Trel.	Accepted		TRO
Piper deflexispicum Trel.	Synonym		TRO
Piper degeneri A.C.Sm.	Unresolved		WCSP (in review)
Piper dekkoanum C.DC.	Unresolved		WCSP (in review)
Piper delatum Trel.	Synonym		TRO
Piper delectans Trel.	Synonym		TRO
Piper delicatum C.DC.	Unresolved		WCSP (in review)
Piper deliciasanum Steyerm.	Accepted		WCSP (in review)
Piper delineatum Trel.	Accepted		TRO
Piper deltoideocarpum Trel.	Synonym		TRO
Piper deltoideum Colla	Unresolved		WCSP (in review)
Piper demeraranum (Miq.) C.DC.	Accepted		WCSP (in review)
Piper demeraranum var. rubescens (C.DC.) Trel. & Yunck.	Synonym		WCSP (in review)
Piper demeusii C.DC.	Unresolved		WCSP (in review)
Piper deminutum Yunck.	Synonym		WCSP (in review)
Piper demonatum Trel.	Unresolved		TRO
Piper demoratum Trel.	Accepted		TRO
Piper dempoanum C.DC.	Unresolved		WCSP (in review)
Piper dendrophilum D.Dietr.	Unresolved		WCSP (in review)
Piper dendropse Trel.	Synonym		TRO
Piper dennisii Trel.	Accepted		TRO
Piper densibaccum C.DC.	Unresolved		WCSP (in review)
Piper densiciliatum Yunck.	Accepted		TRO
Piper densispicatum Steud.	Synonym		TRO
Piper densum Blume	Synonym		TRO
Piper denudans (Miq.) C. DC.	Synonym		TRO
Piper denudans var. angustifolium C. DC.	Synonym		TRO
Piper denudatum Opiz	Unresolved		WCSP (in review)
Piper dependens (Ruiz & Pav.) Vahl	Synonym		TRO
Piper deppeanum (Schltdl. & Cham.) D. Dietr.	Accepted		TRO
Piper depressibaccum Trel.	Unresolved		WCSP (in review)
Piper descourtilsianum C. DC.	Accepted		TRO
Piper desultorium Trel.	Accepted		TRO
Piper detonsum Trel.	Synonym		TRO
Piper diandrum C. DC.	Synonym		TRO
Piper diazanum Trel.	Synonym		TRO
Piper diazanum var. viae-kobeanae Trel.	Synonym		TRO
Piper dichotomum Ruiz & Pav.	Accepted		TRO
Piper dichroostachyum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper diffamatum Trel. & Yunck.	Accepted		WCSP (in review)
Piper diffundum Yunck.	Accepted		TRO
Piper diffusum Blume ex Miq.	Unresolved		WCSP (in review)
Piper diffusum Vahl	Unresolved		WCSP (in review)
Piper diguaense Yunck.	Unresolved		WCSP (in review)
Piper diguetianum Trel.	Synonym		TRO
Piper diguetii C.DC.	Unresolved		WCSP (in review)
Piper dilabrens Trel.	Synonym		TRO
Piper dilatatifolium Trel. & Yunck.	Synonym		WCSP (in review)
Piper dilatatum Rich.	Accepted		WCSP (in review)
Piper dilatatum var. acutifolium C. DC.	Synonym		TRO
Piper dilatatum f. dilatatifolium (Trel. & Yunck.) Steyerm.	Synonym		TRO
Piper dilatatum f. dilatatum	Accepted		TRO
Piper dilatatum f. guayranum Steyerm.	Accepted		TRO
Piper dilatatum var. leptocladum (C. DC.) C. DC.	Synonym		TRO
Piper dilatatum var. pubescens C. DC.	Synonym		TRO
Piper dimetrale C. DC.	Accepted		TRO
Piper dimidiatum (C. Presl) C. DC.	Synonym		TRO
Piper dimorphophyllum Trel.	Synonym		TRO
Piper dimorphotrichum Yunck.	Synonym		TRO
Piper dindingsianum C.DC.	Unresolved		WCSP (in review)
Piper diospyrifolium (Kunth) Kunth ex C. DC.	Accepted		TRO
Piper diospyrifolium Kunth	Unresolved		TRO
Piper dipterocarpinum C.DC.	Unresolved		WCSP (in review)
Piper diquisanum C. DC.	Synonym		TRO
Piper discolor Trel.	Synonym		TRO
Piper discolorum Desf.	Unresolved		WCSP (in review)
Piper discophorum C. DC.	Synonym		TRO
Piper discriminatum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper disjunctum C. DC.	Accepted		TRO
Piper dispansum Trel.	Synonym		TRO
Piper disparifolium Trel.	Synonym		TRO
Piper disparipes Trel.	Synonym		TRO
Piper disparipilum C. DC.	Accepted		TRO
Piper disparispicum Trel.	Synonym		TRO
Piper dissimile (Kunth) Poir.	Synonym		TRO
Piper dissimulans Trel.	Synonym		TRO
Piper distachyon L.	Synonym		WCSP (in review)
Piper distichum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper distigmatum Yunck.	Accepted		TRO
Piper divaricatiranum C.DC.	Unresolved		WCSP (in review)
Piper divaricatum G.Mey.	Accepted		WCSP (in review)
Piper divergens (C. Presl) C. DC.	Accepted		TRO
Piper diversifolium (Kunth) Poir.	Accepted		TRO
Piper diversipilum Trel.	Accepted		TRO
Piper divisurae Trel.	Unresolved		TRO
Piper divortans Trel. & Yunck.	Unresolved		WCSP (in review)
Piper divulgatum Trel. & Yunck.	Accepted		WCSP (in review)
Piper djabia C.DC.	Unresolved		WCSP (in review)
Piper dodsonii Yunck.	Accepted		TRO
Piper dogotense C. DC.	Accepted		TRO
Piper dolabriforme (Kunth) Poir.	Synonym		TRO
Piper dolichostachyum M.G. Gilbert & N.H. Xia	Accepted		TRO
Piper dolichostylum Callejas & Betancur	Unresolved		WCSP (in review)
Piper dolichotrichum Yunck.	Accepted		TRO
Piper dombeyanum (Miq.) C. DC.	Synonym		TRO
Piper dominantinervium Chaveer. & Mokkamul	Unresolved		WCSP (in review)
Piper domingense C. DC.	Synonym		TRO
Piper dominicanum C.DC.	Unresolved		WCSP (in review)
Piper donnell-smithii C. DC.	Synonym		TRO
Piper dotanum Trel.	Accepted		TRO
Piper dryadum C. DC.	Accepted		TRO
Piper dubium A.Dietr.	Unresolved		WCSP (in review)
Piper dubium Miq.	Unresolved		WCSP (in review)
Piper duchassaingii C. DC.	Synonym		TRO
Piper ducis Trel.	Synonym		TRO
Piper duckii C.DC.	Unresolved		WCSP (in review)
Piper duidaense Trel.	Synonym		WCSP (in review)
Piper duidaense var. eciliatum Trel. & Yunck.	Synonym		WCSP (in review)
Piper dukei Yunck.	Accepted		TRO
Piper dulce Trel.	Accepted		TRO
Piper dumeticola C. DC.	Synonym		TRO
Piper dumeticola var. panamense C. DC.	Synonym		TRO
Piper dumetorum C. DC.	Synonym		TRO
Piper dumiformans C.DC.	Unresolved		WCSP (in review)
Piper dumosum Rudge	Accepted		TRO
Piper dunlapii Trel.	Synonym		TRO
Piper dunstervilleorum Steyerm.	Accepted		WCSP (in review)
Piper dupasquieri C. DC.	Synonym		TRO
Piper durilignum C.DC.	Unresolved		WCSP (in review)
Piper durilimbum C.DC.	Unresolved		WCSP (in review)
Piper durirameum C. DC.	Synonym		TRO
Piper durvilleanum Trel.	Accepted		TRO
Piper dussii C.DC.	Unresolved		WCSP (in review)
Piper dussii f. scabridum (DC.) Stehlé	Unresolved		TRO
Piper dussii var. scabridum DC.	Synonym		TRO
Piper ecallosum Trel.	Accepted		TRO
Piper echeverrianum Trel.	Synonym		TRO
Piper echinocaule Yunck.	Accepted		TRO
Piper echinovarium Yunck.	Unresolved		WCSP (in review)
Piper ecuadorense Sodiro	Accepted		TRO
Piper edurum Trel.	Accepted		TRO
Piper edwallii Yunck.	Unresolved		WCSP (in review)
Piper egense C.DC.	Unresolved		WCSP (in review)
Piper eggersii C.DC.	Unresolved		WCSP (in review)
Piper eglandulosum Trel.	Synonym		TRO
Piper ejuncidum Trel.	Synonym		TRO
Piper el-bancoanum Trel. & Yunck.	Accepted		WCSP (in review)
Piper el-caranyanum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper el-metanum Trel. & Yunck.	Synonym		TRO
Piper el-muletonum C. DC. ex Schröd.	Synonym		TRO
Piper el-paramoense Yunck.	Accepted		WCSP (in review)
Piper elasmophyllum Trel.	Synonym		TRO
Piper elatostema Hallier f.	Unresolved		WCSP (in review)
Piper elbertii C.DC.	Unresolved		WCSP (in review)
Piper eldoradens Trel.	Synonym		TRO
Piper ellipticibaccum C.DC.	Unresolved		WCSP (in review)
Piper ellipticifolium Yunck.	Unresolved		WCSP (in review)
Piper elliptico-lanceolatum (C. DC.) Trel.	Synonym		TRO
Piper elliptico-oblongifolium Trel.	Synonym		TRO
Piper ellipticum Hook. & Arn.	Synonym		TRO
Piper ellipticum Lam.	Synonym		TRO
Piper elmeri Merr.	Unresolved		WCSP (in review)
Piper elongatifolium Trel.	Synonym		TRO
Piper elongatum Vahl	Synonym		WCSP (in review)
Piper elongatum (Kunth) Poir. [Illegitimate]	Synonym		WCSP (in review)
Piper elongatum var. brachyarthrum Trel.	Synonym		WCSP (in review)
Piper elongatum var. cordulatum (C.DC.) C.DC.	Synonym		WCSP (in review)
Piper elongatum var. elongatum	Synonym		TRO
Piper elongatum var. laevifolium (C. DC.) Trel.	Synonym		TRO
Piper elongatum var. ossanum (C. DC.) C. DC.	Unresolved		TRO
Piper elongatum var. pampayacusum Trel.	Synonym		TRO
Piper elongatum var. salviaefolium (Miq.) Trel.	Unresolved		TRO
Piper emancipationis Trel.	Synonym		TRO
Piper emancipationis var. longum Trel.	Synonym		TRO
Piper emarginatum (Ruiz & Pav.) Vahl	Synonym		WCSP (in review)
Piper emarginellum Sw. ex Wikstr.	Synonym		WCSP (in review)
Piper emeiense Y.Q. Tseng	Synonym		TRO
Piper emirnense Baker	Synonym		TRO
Piper emmerichianum Yunck.	Accepted		WCSP (in review)
Piper emollitum Trel.	Synonym		TRO
Piper emygdioi Yunck.	Accepted		WCSP (in review)
Piper enckea C. DC.	Synonym		TRO
Piper enckeaespicum (Trel. & Yunck.) Callejas	Accepted		TRO
Piper endlicherianum Trel.	Accepted		TRO
Piper enenyasense Trel.	Accepted		TRO
Piper enganyanum Trel. & Yunck.	Accepted		TRO
Piper ensifolium Quisumb.	Unresolved		WCSP (in review)
Piper entradense Trel. & Yunck.	Accepted		TRO
Piper eocenicum Trel.	Unresolved		WCSP (in review)
Piper epigynium C. DC.	Accepted		TRO
Piper epilosipes Trel.	Synonym		TRO
Piper epilosipes var. heterophyllum Trel.	Synonym		TRO
Piper epunctatum Trel.	Accepted		TRO
Piper epunctulatum C. DC.	Synonym		TRO
Piper erectamentum C. DC.	Synonym		TRO
Piper erecticaule C.DC.	Unresolved		WCSP (in review)
Piper erectipilum Yunck.	Unresolved		WCSP (in review)
Piper erectum Lam. ex Trel.	Unresolved		WCSP (in review)
Piper erectum C.DC.	Unresolved		WCSP (in review)
Piper eriocladum Sodiro	Accepted		TRO
Piper eriopodon (Miq.) C.DC.	Accepted		WCSP (in review)
Piper erubescentispicum Trel.	Accepted		TRO
Piper erythrostachyum C.DC.	Unresolved		WCSP (in review)
Piper erythroxyloides R.E.Schult. & García-Barr.	Unresolved		WCSP (in review)
Piper escaleranum C. DC.	Accepted		TRO
Piper escasuense Trel.	Synonym		TRO
Piper escuadranum Trel.	Synonym		TRO
Piper esculentum Farw.	Unresolved		WCSP (in review)
Piper esmeraldanum Trel.	Synonym		WCSP (in review)
Piper espejuelanum C. DC.	Synonym		TRO
Piper esperancanum Yunck.	Synonym		TRO
Piper esquivelanum Trel.	Synonym		TRO
Piper estrellense C.DC.	Unresolved		WCSP (in review)
Piper estrellense var. pilosius (Miq.) C. DC.	Unresolved		TRO
Piper eucalyptifolium Rudge	Accepted		TRO
Piper eucalyptiphyllum C.DC.	Unresolved		WCSP (in review)
Piper eucalyptolimbum C.DC.	Unresolved		WCSP (in review)
Piper eupodum C.DC.	Unresolved		WCSP (in review)
Piper euryphyllum C. DC.	Synonym		TRO
Piper eustylum Diels	Accepted		TRO
Piper evasum Trel.	Synonym		TRO
Piper evingeri Yunck.	Accepted		TRO
Piper evonymifolium Kunth	Unresolved		WCSP (in review)
Piper evulsipilosum Trel.	Synonym		TRO
Piper ewanii Yunck.	Unresolved		WCSP (in review)
Piper exactum Trel. & Standl.	Unresolved		WCSP (in review)
Piper exasperatum Vahl	Unresolved		WCSP (in review)
Piper excavatum Ruiz & Pav.	Accepted		TRO
Piper excelsum G.Forst.	Unresolved		WCSP (in review)
Piper excelsum var. psittacorum (Endl.) C. DC.	Unresolved		TRO
Piper excessum Trel.	Accepted		TRO
Piper excultum Trel.	Synonym		TRO
Piper exigens Trel.	Synonym		TRO
Piper exigens var. subovatum Trel.	Synonym		TRO
Piper exiguicaule Yunck.	Accepted		TRO
Piper exiguispicum Trel.	Synonym		TRO
Piper exiguum Blume	Synonym		TRO
Piper eximium Kunth	Synonym		WCSP (in review)
Piper expolitum Trel.	Accepted		TRO
Piper exsectum Mart.	Unresolved		WCSP (in review)
Piper exserens (Miq.) C.DC.	Synonym		WCSP (in review)
Piper exserens var. mirafloresanum C. DC.	Synonym		TRO
Piper exserens var. tocotanum C.DC.	Synonym		WCSP (in review)
Piper extensum Roem. & Schult.	Synonym		WCSP (in review)
Piper externum Trel.	Accepted		TRO
Piper factum Trel.	Accepted		TRO
Piper fadyenii C.DC.	Unresolved		WCSP (in review)
Piper faecatum Trel.	Accepted		TRO
Piper fagerlindii Yunck.	Synonym		TRO
Piper fagifolium Trel.	Accepted		TRO
Piper fagopyricarpum Trel.	Synonym		TRO
Piper falanense Trel. & Yunck.	Accepted		TRO
Piper falcatum A. Dietr.	Synonym		TRO
Piper falcifolium Trel.	Synonym		WCSP (in review)
Piper falcigerum Trel.	Synonym		TRO
Piper falcispicum Yunck.	Accepted		TRO
Piper falconeri C.DC.	Unresolved		WCSP (in review)
Piper falculispicum Trel. & Yunck.	Accepted		TRO
Piper falculispicum var. cocanum Trel.	Synonym		TRO
Piper fallax Vahl	Unresolved		WCSP (in review)
Piper fallenii A.H. Gentry	Accepted		TRO
Piper fallens Trel.	Unresolved		WCSP (in review)
Piper famechonii Heckel ex C.DC.	Unresolved		WCSP (in review)
Piper fanshawei Yunck.	Unresolved		WCSP (in review)
Piper fasciculare Rudge	Synonym		TRO
Piper fasciculatum Rudge	Synonym		TRO
Piper fastiditum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper fatoanum C. DC.	Synonym		TRO
Piper faviculiferum Trel.	Synonym		TRO
Piper febrifugum C.DC.	Unresolved		WCSP (in review)
Piper felipense Trel.	Unresolved		TRO
Piper fendlerianum C.DC.	Synonym		WCSP (in review)
Piper fenianum Trel.	Unresolved		WCSP (in review)
Piper fenixii C.DC.	Unresolved		WCSP (in review)
Piper fernandezianum Bertero ex Steud.	Unresolved		WCSP (in review)
Piper ferreyrae Yunck.	Accepted		TRO
Piper ferriei C.DC.	Unresolved		WCSP (in review)
Piper ferruginispicum Trel.	Synonym		TRO
Piper figlinum Trel.	Synonym		TRO
Piper filiforme Sw.	Synonym		WCSP (in review)
Piper filipedunculum C.DC.	Unresolved		WCSP (in review)
Piper filipes C.DC.	Unresolved		WCSP (in review)
Piper filistilum C. DC.	Accepted		TRO
Piper filistilum var. obovatum Sodiro	Synonym		TRO
Piper fimbriulatum C. DC.	Accepted		TRO
Piper finlaysonianum Wall.	Unresolved		WCSP (in review)
Piper firmifolium Trel.	Synonym		TRO
Piper firmolimbum C.DC.	Unresolved		WCSP (in review)
Piper firmum (Miq.) C. DC.	Accepted		TRO
Piper fischerianum C.DC.	Unresolved		WCSP (in review)
Piper fistulosum C. DC.	Synonym		TRO
Piper flabellinerve C. DC.	Synonym		TRO
Piper flagellare Kunth	Synonym		WCSP (in review)
Piper flagellare Mart.	Synonym		TRO
Piper flagellicuspe Trel. & Yunck.	Accepted		TRO
Piper flagelliforme Yamam.	Synonym		TRO
Piper flavescens (C. DC.) Trel.	Synonym		TRO
Piper flavibaccum C.DC.	Unresolved		WCSP (in review)
Piper flavicans C.DC.	Unresolved		WCSP (in review)
Piper flavidum C. DC.	Accepted		TRO
Piper flaviflorum C. DC.	Accepted		TRO
Piper flavifructum Trel.	Unresolved		WCSP (in review)
Piper flavimarginatum C.DC.	Unresolved		WCSP (in review)
Piper flavirameum C. DC.	Synonym		TRO
Piper flavirameum var. obscurum Trel.	Synonym		TRO
Piper flavispicum C.DC.	Unresolved		WCSP (in review)
Piper flavoviride C.DC.	Accepted		WCSP (in review)
Piper flexicaule C. DC.	Accepted		TRO
Piper flexuosum J.Jacq. [Illegitimate]	Synonym		WCSP (in review)
Piper flexuosum Rudge	Synonym		TRO
Piper flongatum Vahl	Accepted		TRO
Piper florencianum Trel. & Yunck.	Synonym		TRO
Piper fluminense C. DC.	Accepted		TRO
Piper fluvii-initii Trel.	Synonym		TRO
Piper fockei Trel. & Yunck.	Accepted		TRO
Piper foetidum Noronha	Unresolved		WCSP (in review)
Piper foliiflorum (Ruiz & Pav.) Vahl	Synonym		TRO
Piper foliosum (Kunth) Poir.	Synonym		TRO
Piper fontanesianum Heynh.	Unresolved		WCSP (in review)
Piper fonteboanum Yunck.	Synonym		TRO
Piper fontinale Roem. & Schult.	Unresolved		WCSP (in review)
Piper fontium Trel.	Unresolved		WCSP (in review)
Piper foreroi A.H.Gentry	Unresolved		WCSP (in review)
Piper formicitolerans Trel.	Synonym		TRO
Piper formosum (Miq.) C. DC.	Accepted		TRO
Piper forstenii C.DC.	Unresolved		WCSP (in review)
Piper fortalezanum Trel.	Accepted		TRO
Piper fortunaense Tebbs	Accepted		TRO
Piper fortunyoanum Trel.	Accepted		TRO
Piper fosbergii Trel.	Synonym		WCSP (in review)
Piper foveolatum Kunth ex C.DC.	Accepted		WCSP (in review)
Piper fragile Benth.	Accepted		WCSP (in review)
Piper fragiliforme C.DC.	Unresolved		WCSP (in review)
Piper fragrans Trel.	Unresolved		WCSP (in review)
Piper fraguanum Trel.	Synonym		TRO
Piper fraguanum var. viride Trel.	Synonym		TRO
Piper franciscanum Trel.	Unresolved		WCSP (in review)
Piper francoae M.A. Jaram. & Callejas	Unresolved		TRO
Piper francovilleanum C.DC.	Accepted		WCSP (in review)
Piper fraseri C. DC.	Synonym		TRO
Piper freirifolium Hochst. ex A.Rich.	Unresolved		WCSP (in review)
Piper fresnoense Trel. & Yunck.	Unresolved		WCSP (in review)
Piper friedrichsthalii C. DC.	Synonym		TRO
Piper frijolesanum Trel.	Unresolved		TRO
Piper frijolesanum var. grandifolium Trel.	Synonym		TRO
Piper frioense Standl. & Steyerm.	Synonym		TRO
Piper froesii Yunck.	Unresolved		WCSP (in review)
Piper frostii Trel. ex Standl.	Unresolved		WCSP (in review)
Piper frustratum Boerl.	Unresolved		WCSP (in review)
Piper frutescens C. DC.	Synonym		TRO
Piper fruticosum Steud.	Unresolved		WCSP (in review)
Piper fuertesii C.DC.	Unresolved		WCSP (in review)
Piper fulgentifolium Yunck.	Accepted		TRO
Piper fulgidum Yunck.	Unresolved		WCSP (in review)
Piper fuligineum Kunth	Accepted		TRO
Piper fuligineum var. laevifolium C. DC.	Synonym		TRO
Piper fuliginosum Sodiro	Accepted		TRO
Piper fulvescens C.DC.	Synonym		WCSP (in review)
Piper fulvescens var. geraense C. DC.	Synonym		TRO
Piper fulvescens var. subglabrum C.DC.	Synonym		WCSP (in review)
Piper fulvescenticaule Trel.	Accepted		TRO
Piper funckii C.DC.	Synonym		WCSP (in review)
Piper fundacionense Steyerm.	Accepted		WCSP (in review)
Piper fungiforme Spokes	Unresolved		WCSP (in review)
Piper furcatipilosum Yunck.	Synonym		WCSP (in review)
Piper furcatum D.Dietr.	Unresolved		WCSP (in review)
Piper furiae Trel.	Synonym		TRO
Piper furiae var. cundinamarcense Trel.	Synonym		TRO
Piper fusagasuganum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper fuscescens C. DC.	Synonym		TRO
Piper fuscescentirameum C.DC.	Unresolved		WCSP (in review)
Piper fuscescentispicum C.DC.	Unresolved		WCSP (in review)
Piper fuscinervium Quisumb.	Unresolved		WCSP (in review)
Piper fuscispicum Trel.	Accepted		TRO
Piper fusco-bracteatum Trel.	Synonym		TRO
Piper fusco-granulatum Trel.	Synonym		TRO
Piper fuscum C. DC.	Synonym		TRO
Piper futokadsura Siebold	Synonym		TRO
Piper futuri Trel. & Yunck.	Accepted		TRO
Piper gabrielianum (Miq.) C. DC.	Accepted		TRO
Piper galeatum (Miq.) C. DC.	Accepted		TRO
Piper galeottianum M. Martens & Galeotti	Accepted		TRO
Piper galicianum Steyerm.	Accepted		WCSP (in review)
Piper galioides (Kunth) Poir.	Synonym		WCSP (in review)
Piper gallatlyi C.DC.	Unresolved		WCSP (in review)
Piper gamblei C.DC.	Unresolved		WCSP (in review)
Piper gamboanum (C. DC.) C. DC.	Synonym		TRO
Piper gamboanum var. yapense Trel.	Synonym		TRO
Piper gammiei C.DC.	Unresolved		WCSP (in review)
Piper garagaranum C. DC.	Accepted		TRO
Piper gardneri C.DC.	Unresolved		WCSP (in review)
Piper gatunense Trel.	Synonym		TRO
Piper gatunense var. cocleanum Trel.	Synonym		TRO
Piper gatunense var. latum Trel.	Synonym		TRO
Piper gaudichaudianum Kunth	Accepted		TRO
Piper gaudichaudianum f. argentina C. DC.	Synonym		TRO
Piper gaudichaudianum var. argentinum C. DC.	Synonym		TRO
Piper gaumeri Trel.	Synonym		TRO
Piper gegarvum C.DC.	Unresolved		WCSP (in review)
Piper gelalae C.DC.	Unresolved		WCSP (in review)
Piper gemellum Willd. ex Link	Unresolved		WCSP (in review)
Piper generalense Trel.	Synonym		TRO
Piper geniculatum Sw.	Synonym		WCSP (in review)
Piper geniculatum var. latifolium C.DC.	Synonym		WCSP (in review)
Piper geniculatum var. longepetiolatum C. DC.	Synonym		TRO
Piper geniculatum f. puberulum C. DC.	Synonym		TRO
Piper geniculatum var. scandens Trel. & Yunck.	Synonym		TRO
Piper gentlei Trel.	Synonym		TRO
Piper gentryi Steyerm.	Accepted		WCSP (in review)
Piper genuflexum Trel.	Synonym		TRO
Piper georginum Trel. & Standl.	Unresolved		WCSP (in review)
Piper gibbiflorum C.DC.	Unresolved		WCSP (in review)
Piper gibbifolium C.DC.	Unresolved		WCSP (in review)
Piper gibbilimbum C.DC.	Unresolved		WCSP (in review)
Piper gibbosum C. DC.	Accepted		TRO
Piper gibbsiae C.DC.	Unresolved		WCSP (in review)
Piper gibsonii C.DC.	Unresolved		WCSP (in review)
Piper gigantifolium C.DC.	Synonym		WCSP (in review)
Piper gigas Trel.	Synonym		TRO
Piper gilvescens Trel.	Accepted		TRO
Piper gilvibaccum Trel.	Accepted		TRO
Piper giordanoi E.F.Guim. & D.Monteiro	Accepted		WCSP (in review)
Piper glabellum Sw.	Synonym		WCSP (in review)
Piper glabellum (Miq.) C. DC.	Synonym		TRO
Piper glaberrimicaule Trel.	Synonym		TRO
Piper glabramentum C.DC.	Unresolved		WCSP (in review)
Piper glabratum (Kunth) Steud.	Accepted		WCSP (in review)
Piper glabratum Kunth	Synonym		TRO
Piper glabrescens (Miq.) C.DC.	Accepted		WCSP (in review)
Piper glabrescens var. caparonum (C. DC.) Yunck.	Accepted		TRO
Piper glabrescens var. venezuelense (C.DC.) Trel. & Yunck.	Accepted		WCSP (in review)
Piper glabribaccum Trel.	Accepted		TRO
Piper glabribracteum Yunck.	Unresolved		WCSP (in review)
Piper glabricaule C. DC.	Synonym		TRO
Piper glabrifolium C. DC.	Synonym		TRO
Piper glabrihaccum Trel.	Unresolved		WCSP (in review)
Piper glabrilimbum C.DC.	Synonym		WCSP (in review)
Piper glabrirameum C. DC.	Synonym		TRO
Piper glabrirhache C.DC.	Unresolved		WCSP (in review)
Piper glabrispica C.DC.	Unresolved		WCSP (in review)
Piper glabrius Trel.	Accepted		TRO
Piper glabrum Mill.	Unresolved		WCSP (in review)
Piper glanduligerum C.DC.	Accepted		WCSP (in review)
Piper glanduligerum var. subcoriaceum C. DC.	Synonym		TRO
Piper glandulosissimum Yunck.	Unresolved		WCSP (in review)
Piper glaucescens Jacq.	Synonym		TRO
Piper glaziovii C. DC.	Synonym		TRO
Piper gleasonii Yunck.	Synonym		TRO
Piper globosum C. DC.	Synonym		TRO
Piper globosum Poir.	Synonym		TRO
Piper globulantherum C.DC.	Unresolved		WCSP (in review)
Piper globulistigmum C.DC.	Unresolved		WCSP (in review)
Piper glyphicum Hoffmanns. ex Kunth	Unresolved		WCSP (in review)
Piper godetii C.DC.	Unresolved		WCSP (in review)
Piper goeldii C.DC.	Unresolved		WCSP (in review)
Piper goergeri Trel.	Synonym		TRO
Piper goesii Yunck.	Unresolved		WCSP (in review)
Piper gonagricum Trel.	Synonym		TRO
Piper gonocarpum Trel.	Accepted		TRO
Piper gorgonae-insulae Trel. & Yunck.	Synonym		TRO
Piper gorgonillense Trel. & Yunck.	Unresolved		WCSP (in review)
Piper goudotii C. DC.	Synonym		TRO
Piper gracile Ruiz & Pav.	Accepted		TRO
Piper gracilipedunculum Trel.	Synonym		TRO
Piper gracilipes C.DC.	Unresolved		WCSP (in review)
Piper gracilirameum C. DC.	Synonym		TRO
Piper graciliramosum Yunck.	Unresolved		WCSP (in review)
Piper gracilispicum C. DC.	Synonym		TRO
Piper gracillimum Trel.	Synonym		TRO
Piper gracillimum var. dantoense Trel.	Synonym		TRO
Piper graeffei Warb.	Unresolved		WCSP (in review)
Piper grahami Trel.	Synonym		TRO
Piper granatense D. Dietr.	Synonym		TRO
Piper granatense C. DC.	Synonym		TRO
Piper grande Vahl	Accepted		WCSP (in review)
Piper grande var. puberulentum Yunck.	Synonym		TRO
Piper grandifolium Kunth	Synonym		TRO
Piper grandifolium Afzel.	Synonym		TRO
Piper grandilimbum C. DC.	Synonym		TRO
Piper grandipedunculum C.DC.	Unresolved		WCSP (in review)
Piper grandispicum C.DC.	Unresolved		WCSP (in review)
Piper grantii Yunck.	Unresolved		WCSP (in review)
Piper granulatum Trel.	Synonym		TRO
Piper granuligerum Trel.	Accepted		TRO
Piper granulosum Ruiz & Pav.	Accepted		TRO
Piper gratum Trel.	Accepted		TRO
Piper graveolens C.DC.	Unresolved		WCSP (in review)
Piper griffithii C.DC.	Unresolved		WCSP (in review)
Piper griseocaule Trel.	Accepted		TRO
Piper griseolimbum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper griseopubens Trel.	Synonym		TRO
Piper griseopubens var. revocabile Trel.	Synonym		TRO
Piper griseoreticulatum Trel.	Unresolved		WCSP (in review)
Piper griseovenosum Trel.	Synonym		TRO
Piper griseum C. DC.	Accepted		TRO
Piper guabinachanum Trel.	Unresolved		WCSP (in review)
Piper guacimonum (C. DC.) Trel.	Accepted		TRO
Piper guadaloupense C.DC.	Unresolved		WCSP (in review)
Piper guadratilimbum Trel.	Unresolved		TRO
Piper guahamense C.DC.	Unresolved		WCSP (in review)
Piper gualeanum C. DC.	Accepted		TRO
Piper guanacostense C.DC.	Unresolved		WCSP (in review)
Piper guanahacabibense Borhidi	Unresolved		WCSP (in review)
Piper guanaianum C. DC.	Synonym		TRO
Piper guapense Yunck.	Unresolved		WCSP (in review)
Piper guaremalesanum Trel. & Yunck.	Synonym		WCSP (in review)
Piper guatopoense Yunck.	Accepted		WCSP (in review)
Piper guavanum C.DC.	Unresolved		WCSP (in review)
Piper guayasanum C. DC.	Synonym		TRO
Piper guayranum C. DC.	Synonym		TRO
Piper guayranum var. humilior (C. DC.) Trel. & Yunck.	Synonym		TRO
Piper guazacapanense Trel. & Standl.	Unresolved		WCSP (in review)
Piper guedesii C. DC.	Synonym		TRO
Piper guianense (Klotzsch) C.DC.	Accepted		WCSP (in review)
Piper guigual Buch.-Ham. ex D. Don	Synonym		TRO
Piper guildingianum Spreng.	Synonym		TRO
Piper guineense Schumach. & Thonn.	Accepted		WCSP (in review)
Piper gurupanum Yunck.	Unresolved		WCSP (in review)
Piper gutierrezii Yunck.	Unresolved		WCSP (in review)
Piper gymnocladum C.DC.	Unresolved		WCSP (in review)
Piper gymnophyllum C.DC.	Unresolved		WCSP (in review)
Piper gymnostachyum C.DC.	Unresolved		WCSP (in review)
Piper haenkeanum D.Dietr.	Unresolved		WCSP (in review)
Piper haenkeanum Opiz	Unresolved		WCSP (in review)
Piper hahnii C.DC.	Unresolved		WCSP (in review)
Piper hainana K.Schum.	Unresolved		WCSP (in review)
Piper hainanense Hemsl.	Accepted		TRO
Piper halconense C.DC.	Unresolved		WCSP (in review)
Piper halesiaefolium (Miq.) Kunth ex C. DC.	Accepted		TRO
Piper hallieri C.DC.	Unresolved		WCSP (in review)
Piper hamiltonii C.DC.	Unresolved		WCSP (in review)
Piper hancei Maxim.	Accepted		TRO
Piper hanckelii Trel.	Synonym		TRO
Piper hapnium Buch.-Ham.	Unresolved		WCSP (in review)
Piper haridasanii Gajurel, Rethy & Y.Kumar	Unresolved		WCSP (in review)
Piper harlingii Yunck.	Accepted		TRO
Piper harmandii C.DC.	Unresolved		WCSP (in review)
Piper harrisii C.DC.	Unresolved		WCSP (in review)
Piper hartii C.DC.	Unresolved		WCSP (in review)
Piper hartwegianum (Benth.) C. DC.	Accepted		TRO
Piper harveyanum Domin	Unresolved		WCSP (in review)
Piper hassleri C.DC.	Accepted		WCSP (in review)
Piper hastularum Yunck.	Synonym		TRO
Piper hastularum var. longipetiolatum Trel. & Yunck.	Synonym		TRO
Piper hatschbachii Yunck.	Accepted		WCSP (in review)
Piper haughtii Trel. & Yunck.	Accepted		TRO
Piper havilandii C.DC.	Unresolved		WCSP (in review)
Piper haworthianum Schult.	Unresolved		WCSP (in review)
Piper hayesii Trel.	Synonym		TRO
Piper hayneanum C.DC.	Unresolved		WCSP (in review)
Piper hebetata	Unresolved		TRO
Piper hebetifolium W.C. Burger	Accepted		TRO
Piper hederaceum (Miq.) C. DC.	Accepted		TRO
Piper heimii C.DC.	Unresolved		WCSP (in review)
Piper hemionitidifolium D.Dietr.	Unresolved		WCSP (in review)
Piper hemmendorffii C. DC.	Accepted		TRO
Piper henryci C. DC.	Synonym		TRO
Piper henryei C.DC.	Unresolved		WCSP (in review)
Piper henshenii C.DC.	Synonym		WCSP (in review)
Piper heptandrum (Miq.) C. DC.	Accepted		TRO
Piper heptaneurum Trel.	Synonym		TRO
Piper heraldi Trel.	Synonym		TRO
Piper heraldi var. amplius Trel.	Synonym		TRO
Piper heraldi var. cocleanum Trel.	Synonym		TRO
Piper herbaceum Miq.	Synonym		TRO
Piper hermannii Trel. & Yunck.	Accepted		WCSP (in review)
Piper hermes Trel. & Standl.	Unresolved		WCSP (in review)
Piper hermosanum Yunck.	Unresolved		WCSP (in review)
Piper hernandiifolium Vahl	Synonym		WCSP (in review)
Piper herrerae Trel.	Accepted		TRO
Piper herzogii C. DC.	Synonym		TRO
Piper heterobracteum Steyerm.	Accepted		WCSP (in review)
Piper heterocarpum Trel.	Accepted		TRO
Piper heteromallum Pers.	Synonym		TRO
Piper heterophlebium Trel.	Synonym		TRO
Piper heterophyllum Ruiz & Pav.	Accepted		TRO
Piper heterostachyon (A. Dietr.) D. Dietr.	Synonym		TRO
Piper heterostachyum D.Dietr.	Unresolved		WCSP (in review)
Piper heterotrichum C. DC.	Accepted		TRO
Piper hexandrum C. DC.	Unresolved		TRO
Piper heydei C.DC. ex Donn.Sm.	Unresolved		WCSP (in review)
Piper hians Trel.	Synonym		TRO
Piper hieronymi C. DC.	Accepted		TRO
Piper hieronymi var. hieronymi	Accepted		TRO
Piper hilarianum (Miq.) C. DC.	Synonym		TRO
Piper hillianum C. DC.	Accepted		TRO
Piper hippocrepiforme Steyerm.	Accepted		WCSP (in review)
Piper hirsutissimum D.Dietr.	Unresolved		WCSP (in review)
Piper hirsutum Sw.	Synonym		WCSP (in review)
Piper hirsutum var. asperiusculum (Kunth) C. DC.	Synonym		TRO
Piper hirsutum var. barclayanum (Miq.) C. DC.	Synonym		TRO
Piper hirsutum var. carpinterae C. DC.	Synonym		TRO
Piper hirsutum var. laevius C. DC.	Synonym		TRO
Piper hirsutum var. longepilosum C. DC.	Synonym		TRO
Piper hirsutum var. magnifolium C. DC.	Synonym		TRO
Piper hirsutum var. parvifolium C. DC.	Synonym		TRO
Piper hirsutum var. tonduzii C. DC.	Synonym		TRO
Piper hirtellipetiolum C. DC.	Accepted		TRO
Piper hirtellipetiolum var. harveyanum (Trel.) Yunck.	Accepted		TRO
Piper hirtellipetiolum var. tapianum (Trel.) Yunck.	Accepted		TRO
Piper hirtellum C.DC.	Unresolved		WCSP (in review)
Piper hirtilimbum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper hirtirhache C.DC.	Unresolved		WCSP (in review)
Piper hirtovarium C.DC.	Unresolved		WCSP (in review)
Piper hirtulum (C. Presl) C. DC.	Accepted		TRO
Piper hispaniolae Trel.	Unresolved		WCSP (in review)
Piper hispidiramum C.DC.	Unresolved		WCSP (in review)
Piper hispidiseptum Trel.	Synonym		TRO
Piper hispidonervum C.DC.	Unresolved		WCSP (in review)
Piper hispidulum Sw.	Synonym		WCSP (in review)
Piper hispidum Sw.	Accepted		WCSP (in review)
Piper hispidum Kunth	Unresolved		TRO
Piper hispidum Hayata	Synonym		TRO
Piper hispidum var. ellipticifolium Yunck.	Synonym		TRO
Piper hispidum var. gamboanum C. DC.	Synonym		TRO
Piper hispidum var. hispidum	Accepted		TRO
Piper hispidum var. lanceolatum Trel. & Yunck.	Synonym		TRO
Piper hispidum f. lanceolatum Steyerm.	Accepted		TRO
Piper hispidum var. magnifolium C. DC.	Synonym		TRO
Piper hispidum var. obliquum Trel. & Yunck.	Synonym		TRO
Piper hispidum var. trachydermum (Trel.) Yunck.	Synonym		WCSP (in review)
Piper hochiense Y.Q. Tseng	Accepted		TRO
Piper hodgei Yunck.	Unresolved		WCSP (in review)
Piper hoehnei Yunck.	Unresolved		WCSP (in review)
Piper hoffmannseggianum Schult.	Unresolved		WCSP (in review)
Piper hohenackeri C. DC.	Synonym		TRO
Piper holdridgeanum W.C. Burger	Accepted		TRO
Piper holdrigeianum W.C.Burger	Unresolved		WCSP (in review)
Piper holguinianum Trel.	Unresolved		WCSP (in review)
Piper hollrungii K.Schum. & Lauterb.	Unresolved		WCSP (in review)
Piper holtii Trel. & Yunck.	Accepted		WCSP (in review)
Piper holtonii C.DC.	Accepted		WCSP (in review)
Piper holtonii var. cundinamarcanum Trel. & Yunck. [Unplaced]	Unresolved		WCSP (in review)
Piper holtonii var. parvispicum Yunck.	Synonym		TRO
Piper hondonadense Trel. & Yunck.	Unresolved		WCSP (in review)
Piper hongkongense C. DC.	Accepted		TRO
Piper hooglandii (I. Hutton & P.S. Green) M.A. Jaram.	Accepted		TRO
Piper hookeri Miq.	Unresolved		WCSP (in review)
Piper hookerianum (Miq.) C. DC.	Accepted		TRO
Piper hosei C.DC.	Unresolved		WCSP (in review)
Piper hosokawae Fosberg	Unresolved		WCSP (in review)
Piper hostmannianum (Miq.) C.DC.	Accepted		WCSP (in review)
Piper hostmannianum var. berbicense (Miq.) C. DC.	Synonym		TRO
Piper hostmannianum var. glabrirameum Trel. & Yunck.	Synonym		WCSP (in review)
Piper hostmannianum var. ramiflorum C. DC.	Synonym		TRO
Piper huacachianum Trel.	Accepted		TRO
Piper huacapistanum Trel.	Accepted		TRO
Piper huallaganum Trel.	Accepted		TRO
Piper huantanum Trel.	Unresolved		WCSP (in review)
Piper huanucanum Trel.	Synonym		TRO
Piper huberi C.DC.	Unresolved		WCSP (in review)
Piper huegelianum (Miq.) Miq.	Synonym		TRO
Piper huegelianum (Miq.) C. DC.	Accepted		TRO
Piper huigranum Trel. & Yunck.	Accepted		TRO
Piper huilanum C.DC.	Unresolved		WCSP (in review)
Piper humaytanum Yunck.	Unresolved		WCSP (in review)
Piper humblotii C. DC.	Synonym		TRO
Piper humile C. DC.	Synonym		TRO
Piper humile Vahl	Synonym		TRO
Piper humile Mill.	Synonym		TRO
Piper humillimum C.DC.	Unresolved		WCSP (in review)
Piper humistratum Görts & K.U. Kramer	Accepted		TRO
Piper humoense Trel.	Synonym		TRO
Piper humorigaudens Trel.	Synonym		TRO
Piper hyalinum Wall.	Unresolved		WCSP (in review)
Piper hydrangeifolium Kunth	Unresolved		WCSP (in review)
Piper hydrocotylifolium M. Martens & Galeotti	Synonym		TRO
Piper hydrolapathum C. DC.	Accepted		TRO
Piper hylebates C. DC.	Accepted		TRO
Piper hylophilum C. DC.	Accepted		TRO
Piper hymenophyllum (Miq.) Wight	Unresolved		WCSP (in review)
Piper hymenopodum Sodiro	Accepted		TRO
Piper hypoglaucum Miq.	Unresolved		WCSP (in review)
Piper hypoleucum Sodiro	Accepted		TRO
Piper ibaguense Trel.	Synonym		TRO
Piper ichangense C. DC.	Synonym		TRO
Piper ictum Trel.	Synonym		TRO
Piper ignacioanum Trel. & Yunck.	Synonym		TRO
Piper ilheusense Yunck.	Unresolved		WCSP (in review)
Piper illautum Trel.	Accepted		TRO
Piper illudens Trel.	Synonym		TRO
Piper imberbe Trel. & Standl.	Unresolved		WCSP (in review)
Piper immite Trel.	Accepted		TRO
Piper immutatum Trel.	Accepted		TRO
Piper imparipes Trel.	Synonym		TRO
Piper imperiale (Miq.) C. DC.	Accepted		TRO
Piper imperspicuibracteum Trel.	Synonym		TRO
Piper impube Trel.	Synonym		TRO
Piper impunctatum Link	Synonym		TRO
Piper inaequale C.DC.	Unresolved		WCSP (in review)
Piper inaequalifolium (Ruiz & Pav.) Vahl	Synonym		WCSP (in review)
Piper inauspicatum Trel.	Accepted		TRO
Piper incanum Haw.	Synonym		TRO
Piper incisicuspe Trel.	Synonym		TRO
Piper incisum Rich. ex C.DC.	Unresolved		WCSP (in review)
Piper incitum Trel.	Synonym		TRO
Piper inclemens Trel. & Yunck.	Accepted		TRO
Piper incomptum Trel.	Accepted		TRO
Piper inconsumptum Trel.	Synonym		TRO
Piper incurvum Sieber ex Schult.	Synonym		TRO
Piper indecorum Kunth	Accepted		TRO
Piper indianonum Trel.	Accepted		TRO
Piper indiciflexum Trel.	Accepted		TRO
Piper indicum Garsault [Invalid]	Synonym		WCSP (in review)
Piper indignum Trel.	Synonym		TRO
Piper inebrians Bertero ex Miq.	Unresolved		WCSP (in review)
Piper inebrians Royle	Unresolved		WCSP (in review)
Piper infidele Trel. & Yunck.	Synonym		TRO
Piper infossibaccatum A. Huang	Accepted		TRO
Piper infossum Y.Q. Tseng	Accepted		TRO
Piper infraluteum Trel.	Synonym		TRO
Piper inhorrescens Trel.	Synonym		TRO
Piper injucundum Trel.	Synonym		TRO
Piper injucundum var. praecalvinervium Trel.	Synonym		TRO
Piper injucundum var. praepubinervium Trel.	Synonym		TRO
Piper insectifugum C.DC. ex Seem.	Accepted		WCSP (in review)
Piper insigne (Kunth) Kunth ex C. DC.	Accepted		TRO
Piper insignifolium C. DC.	Synonym		TRO
Piper insignilaminum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper insignilimbum C.DC.	Unresolved		WCSP (in review)
Piper insipiens Trel. & Yunck.	Synonym		TRO
Piper insolens Trel.	Synonym		TRO
Piper instabilipes Trel.	Unresolved		WCSP (in review)
Piper insulicolum Trel.	Synonym		TRO
Piper interitum Trel.	Accepted		TRO
Piper internibaccum C.DC.	Unresolved		WCSP (in review)
Piper internovarium C.DC.	Unresolved		WCSP (in review)
Piper interruptum Opiz	Accepted		WCSP (in review)
Piper interruptum var. multinervum C. DC.	Synonym		TRO
Piper intersitum f. porcecitense Trel.	Synonym		TRO
Piper intonsum Trel.	Accepted		TRO
Piper inversum C.DC.	Unresolved		WCSP (in review)
Piper iquitosense Trel.	Accepted		TRO
Piper irazuanum C. DC.	Synonym		TRO
Piper irazuanum var. suborbiculatum Trel.	Synonym		TRO
Piper irrasum Trel.	Synonym		TRO
Piper isernii Trel.	Synonym		TRO
Piper isopleurum C.DC.	Unresolved		WCSP (in review)
Piper itacolumianum C.DC.	Unresolved		WCSP (in review)
Piper itatiaianum C.DC.	Unresolved		WCSP (in review)
Piper itayanum Trel.	Accepted		TRO
Piper ivonense Yunck.	Unresolved		WCSP (in review)
Piper ixocubvainense Standl. & Steyerm.	Unresolved		WCSP (in review)
Piper izabalensis	Unresolved		TRO
Piper jaboncillanum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper jaborandii Vell.	Unresolved		WCSP (in review)
Piper jacquemontianum Kunth	Accepted		TRO
Piper jacquinianum Schult.	Synonym		WCSP (in review)
Piper jacquinii C.DC.	Synonym		WCSP (in review)
Piper jactatum Trel. & Standl.	Synonym		TRO
Piper jaculifolium Trel.	Synonym		TRO
Piper jalapense M. Martens & Galeotti	Accepted		TRO
Piper jalapensis (Miq.) C. DC.	Accepted		TRO
Piper jaliscanum S.Watson	Unresolved		WCSP (in review)
Piper jamaicense C.DC.	Unresolved		WCSP (in review)
Piper jamaoanum Trel.	Unresolved		WCSP (in review)
Piper jamesoni C. DC.	Synonym		TRO
Piper janeiroense C.DC.	Unresolved		WCSP (in review)
Piper japurense (Miq.) C. DC.	Accepted		TRO
Piper japvonum C.DC.	Unresolved		WCSP (in review)
Piper jauaense Steyerm.	Accepted		WCSP (in review)
Piper javanicum C.DC.	Unresolved		WCSP (in review)
Piper javariense Yunck.	Unresolved		WCSP (in review)
Piper javitense Kunth	Accepted		WCSP (in review)
Piper jayeri C.DC.	Unresolved		WCSP (in review)
Piper jenkinsii C.DC.	Unresolved		WCSP (in review)
Piper jericoense Trel. & Yunck.	Synonym		TRO
Piper johnstonii C.DC.	Synonym		WCSP (in review)
Piper jubatum Trel.	Synonym		TRO
Piper jubimarginatum Yunck.	Unresolved		WCSP (in review)
Piper julianii Callejas	Accepted		WCSP (in review)
Piper juliflorum Nees & Mart.	Unresolved		WCSP (in review)
Piper jumayense Trel. & Standl.	Unresolved		WCSP (in review)
Piper jussiaeanum Kunth	Synonym		TRO
Piper jussiaeanum (Kunth) Kunth ex C. DC.	Accepted		TRO
Piper kadsura (Choisy) Ohwi	Accepted		TRO
Piper kandavuense A.C.Sm.	Unresolved		WCSP (in review)
Piper kanehiranum Trel.	Accepted		TRO
Piper kantetulense Trel.	Synonym		TRO
Piper kantetulense var. gentlei Trel.	Synonym		TRO
Piper kappleri C. DC.	Accepted		TRO
Piper kapruanum C.DC.	Unresolved		WCSP (in review)
Piper karok Blume	Unresolved		WCSP (in review)
Piper karwinskianum Kunth	Unresolved		TRO
Piper karwinskianum (Kunth) Kunth ex C. DC.	Accepted		TRO
Piper kawakamii Hayata	Accepted		TRO
Piper kegelianum (Miq.) C.DC.	Accepted		WCSP (in review)
Piper kegelii C. DC.	Accepted		TRO
Piper kerberi C.DC.	Unresolved		WCSP (in review)
Piper kewense C.DC.	Unresolved		WCSP (in review)
Piper keyanum C.DC.	Unresolved		WCSP (in review)
Piper khasianum C.DC.	Unresolved		WCSP (in review)
Piper kietanum C.DC.	Synonym		WCSP (in review)
Piper killipii Trel.	Synonym		TRO
Piper killipii var. calderanum Trel.	Synonym		TRO
Piper kimpitirikianum Trel.	Accepted		TRO
Piper kleinii Yunck.	Accepted		WCSP (in review)
Piper klossii Ridl.	Unresolved		WCSP (in review)
Piper klotzschianum (Kunth) C. DC.	Accepted		TRO
Piper klugianum Trel.	Accepted		TRO
Piper klugii Yunck.	Accepted		TRO
Piper koepperi Trel.	Synonym		TRO
Piper konkintoense Trel.	Synonym		TRO
Piper koordersii C.DC. ex Koord.	Unresolved		WCSP (in review)
Piper koordersii C.DC.	Unresolved		WCSP (in review)
Piper korthalsii Miq.	Unresolved		WCSP (in review)
Piper kotanum C.DC.	Unresolved		WCSP (in review)
Piper kotoense Yamam.	Synonym		TRO
Piper kraense Ridl.	Unresolved		WCSP (in review)
Piper kreangense C.DC.	Unresolved		WCSP (in review)
Piper krintjingense C.DC.	Unresolved		WCSP (in review)
Piper krukoffii Yunck.	Synonym		TRO
Piper kuhlmannii Yunck.	Unresolved		WCSP (in review)
Piper kunstleri C.DC.	Unresolved		WCSP (in review)
Piper kunthianum Steud.	Unresolved		WCSP (in review)
Piper kunthii (Miq.) C. DC.	Accepted		TRO
Piper kuntzei C. DC.	Synonym		TRO
Piper kurzii Ridl.	Unresolved		WCSP (in review)
Piper kurzii C.DC.	Unresolved		WCSP (in review)
Piper kusaiense Hosok.	Unresolved		WCSP (in review)
Piper kwashoense Hayata	Accepted		TRO
Piper labeculatum Trel.	Synonym		TRO
Piper labillardieri C.DC.	Unresolved		WCSP (in review)
Piper laceratibracteum Trel.	Synonym		TRO
Piper lacunosifolium Trel.	Synonym		TRO
Piper lacunosum Kunth	Accepted		WCSP (in review)
Piper ladrillense Trel.	Synonym		TRO
Piper laedans Trel.	Synonym		TRO
Piper laeteviride Ekman ex Trel.	Unresolved		WCSP (in review)
Piper laetispicum C. DC.	Accepted		TRO
Piper laetum (Kunth) C. DC.	Accepted		TRO
Piper laevibracteum Trel.	Synonym		TRO
Piper laevicarpum Yunck.	Accepted		WCSP (in review)
Piper laevifolium C. DC.	Synonym		TRO
Piper laevifolium Blume	Synonym		TRO
Piper laevigatum Kunth	Accepted		TRO
Piper laevilimbum C. DC.	Synonym		TRO
Piper laevirameum C.DC.	Unresolved		WCSP (in review)
Piper laevius (C. DC.) Trel.	Synonym		TRO
Piper lagenaebaccum Trel.	Accepted		TRO
Piper lageniovarium C.DC.	Unresolved		WCSP (in review)
Piper lagoaense C.DC.	Unresolved		WCSP (in review)
Piper laguna-cochanum Trel. & Yunck.	Accepted		WCSP (in review)
Piper lagunaense Trel. & Yunck.	Unresolved		WCSP (in review)
Piper lainatakanum C.DC.	Unresolved		WCSP (in review)
Piper lamasense Trel.	Accepted		TRO
Piper lambeauense C.DC.	Unresolved		WCSP (in review)
Piper lanatibracteum Trel.	Synonym		TRO
Piper lanceaefolium Kunth	Accepted		TRO
Piper lanceatum A.Dietr.	Unresolved		WCSP (in review)
Piper lanceibracteum Trel.	Unresolved		TRO
Piper lanceifolium var. acutiusculum C. DC.	Synonym		TRO
Piper lanceifolium var. latifolium Sodiro	Synonym		TRO
Piper lanceifolium var. plicatum Sodiro	Synonym		TRO
Piper lanceolatum Ruiz & Pav.	Accepted		TRO
Piper lanceolatum var. latifolium C. DC.	Synonym		TRO
Piper lanceolatum var. mucronatum C. DC.	Synonym		TRO
Piper lanceolatum var. tricuspe (Miq.) C. DC.	Synonym		TRO
Piper lancetillanum Trel.	Synonym		TRO
Piper lanciferum Standl. & Steyerm.	Unresolved		WCSP (in review)
Piper lancilimbum Yunck.	Accepted		TRO
Piper landakanum C.DC.	Unresolved		WCSP (in review)
Piper langlassei C.DC.	Unresolved		WCSP (in review)
Piper langsdorffianum C. DC.	Synonym		TRO
Piper langsdorfii Schrank	Unresolved		WCSP (in review)
Piper lanosibracteum Trel.	Synonym		TRO
Piper lanosicaule Trel.	Accepted		TRO
Piper lanuginosum C. DC.	Synonym		TRO
Piper lapathifolium (Kunth) Steud.	Accepted		TRO
Piper lappaceum (Benn.) C.DC.	Synonym		WCSP (in review)
Piper late-ovatum Trel.	Accepted		TRO
Piper lateoblongum S.Moore	Unresolved		WCSP (in review)
Piper laterifissum Trel.	Synonym		TRO
Piper lateripilosum Yunck.	Accepted		WCSP (in review)
Piper latibracteum C. DC.	Accepted		TRO
Piper latifolium L. f.	Accepted		TRO
Piper latilimbum C.DC.	Unresolved		WCSP (in review)
Piper latum Kunth	Synonym		WCSP (in review)
Piper laurentii De Wild.	Unresolved		WCSP (in review)
Piper laurifolium Kunth	Synonym		TRO
Piper laurinum Roem. & Schult.	Accepted		TRO
Piper lauterbachii C.DC.	Unresolved		WCSP (in review)
Piper lawrancei Trel. & Yunck.	Unresolved		WCSP (in review)
Piper laxiflorum Poir.	Unresolved		WCSP (in review)
Piper laxirameum C.DC.	Unresolved		WCSP (in review)
Piper laxispicum Trel.	Synonym		TRO
Piper laxispicum var. latifolium C. DC. ex Trel.	Synonym		TRO
Piper laxivenum C.DC.	Unresolved		WCSP (in review)
Piper laxum Vahl	Unresolved		WCSP (in review)
Piper lechlerianum C. DC.	Accepted		TRO
Piper ledebourii C.DC.	Unresolved		WCSP (in review)
Piper ledermannii C.DC.	Unresolved		WCSP (in review)
Piper ledezmae Trel. & Yunck.	Synonym		TRO
Piper lehmannianum (Miq.) C. DC.	Accepted		TRO
Piper leiophyllum C. DC.	Synonym		TRO
Piper lemaense Yunck.	Accepted		WCSP (in review)
Piper lenormandianum C. DC.	Synonym		TRO
Piper lentaginoides Kunth	Unresolved		WCSP (in review)
Piper lenticellosum C. DC.	Synonym		TRO
Piper leonense C.DC.	Unresolved		WCSP (in review)
Piper lepidotum D.Parodi	Unresolved		WCSP (in review)
Piper leprieurii (Miq.) Pulle	Synonym		WCSP (in review)
Piper leptocladum C. DC.	Synonym		TRO
Piper leptonema Hook.f.	Unresolved		WCSP (in review)
Piper leptoneuron C. DC.	Synonym		TRO
Piper leptophyllum C.DC.	Synonym		WCSP (in review)
Piper leptostachyon Nutt.	Synonym		TRO
Piper leptostachyum Willd. ex Kunth	Synonym		TRO
Piper leptostilum C.DC.	Unresolved		WCSP (in review)
Piper lepturum (Kunth) C. DC.	Accepted		TRO
Piper lepturum Kunth	Unresolved		TRO
Piper lepturum var. angustifolium (C. DC.) Yunck.	Synonym		TRO
Piper lessertianum (Miq.) C. DC.	Synonym		TRO
Piper leticianum C. DC.	Accepted		TRO
Piper leucanthum C.DC.	Unresolved		WCSP (in review)
Piper leucofustum Trel.	Synonym		TRO
Piper leucophaeocaule Trel.	Accepted		TRO
Piper leucophaeum Trel.	Accepted		TRO
Piper leucophlebium Trel.	Synonym		TRO
Piper leucophyllum (Miq.) C. DC.	Accepted		TRO
Piper leucostachyum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper levilimbum Trel.	Synonym		TRO
Piper leyteanum C.DC.	Unresolved		WCSP (in review)
Piper lhotzkyanum Kunth	Accepted		TRO
Piper lhotzkyanum (Miq.) C. DC.	Unresolved		TRO
Piper liebmannii C. DC.	Accepted		TRO
Piper liesneri Steyerm.	Accepted		WCSP (in review)
Piper ligatispicum Trel.	Synonym		TRO
Piper limae Yunck.	Accepted		WCSP (in review)
Piper limonense Trel. ex Badillo	Synonym		TRO
Piper limonense var. cardenasianum Trel. ex Badillo	Synonym		TRO
Piper limosum Yunck.	Accepted		WCSP (in review)
Piper lincolnense Trel.	Synonym		TRO
Piper lindbergii C. DC.	Synonym		TRO
Piper lindenianum C.DC.	Unresolved		WCSP (in review)
Piper lindenii (Miq.) C. DC.	Accepted		TRO
Piper linearifolium C. DC.	Synonym		TRO
Piper lineatipilosum Yunck.	Accepted		TRO
Piper lineatipilum C.DC.	Unresolved		WCSP (in review)
Piper lineativillosum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper lineatum Ruiz & Pav.	Accepted		TRO
Piper lineatum var. hirtipetiolatum Trel.	Synonym		TRO
Piper lineatum var. leucolepidum Trel.	Synonym		TRO
Piper lineatum var. lineatum	Accepted		TRO
Piper lineolatifolium Trel. & Yunck.	Accepted		TRO
Piper lingshuiense Y.Q. Tseng	Accepted		TRO
Piper linguifolium Ham.	Unresolved		WCSP (in review)
Piper linguliforme Steyerm.	Accepted		WCSP (in review)
Piper lippoldii Saralegui	Unresolved		WCSP (in review)
Piper liratinerve Trel.	Synonym		TRO
Piper listeri C.DC.	Unresolved		WCSP (in review)
Piper littlei Yunck.	Unresolved		WCSP (in review)
Piper littorale C. DC.	Accepted		TRO
Piper lividum C.DC.	Unresolved		WCSP (in review)
Piper llatanum Trel.	Accepted		TRO
Piper loefgrenii Yunck.	Accepted		WCSP (in review)
Piper loheri C.DC.	Unresolved		WCSP (in review)
Piper lolot C. DC.	Synonym		TRO
Piper lonchites Schult.	Unresolved		WCSP (in review)
Piper lonchites Wall.	Unresolved		WCSP (in review)
Piper longamentum C.DC.	Unresolved		WCSP (in review)
Piper longeacuminatum Trel.	Accepted		TRO
Piper longegerminatum Trel.	Synonym		TRO
Piper longepetiolatum (C. DC.) Trel.	Accepted		TRO
Piper longepilosum C. DC.	Accepted		TRO
Piper longestamineum Trel.	Accepted		TRO
Piper longestylosum C. DC.	Accepted		TRO
Piper longevillosum Trel.	Synonym		TRO
Piper longiappendiculatum Steyerm.	Accepted		WCSP (in review)
Piper longiauriculatum Yunck.	Unresolved		WCSP (in review)
Piper longibracteum C.DC.	Unresolved		WCSP (in review)
Piper longicaudatum Trel. & Yunck.	Accepted		TRO
Piper longicaule C.DC.	Unresolved		WCSP (in review)
Piper longichaetum Yunck.	Unresolved		WCSP (in review)
Piper longicuspe Willd. ex Kunth	Synonym		TRO
Piper longifilamentosum Trel.	Synonym		TRO
Piper longifilamentum C.DC.	Unresolved		WCSP (in review)
Piper longiflorum Willd. ex D.Dietr.	Unresolved		WCSP (in review)
Piper longifolium Ruiz & Pav.	Accepted		TRO
Piper longifolium var. pilosum C. DC.	Synonym		TRO
Piper longilimbum C.DC.	Unresolved		WCSP (in review)
Piper longimucronatum Yunck.	Unresolved		WCSP (in review)
Piper longipedicellatum Quisumb.	Unresolved		WCSP (in review)
Piper longipedunculatum D.Dietr.	Unresolved		WCSP (in review)
Piper longipedunculatum C.DC.	Unresolved		WCSP (in review)
Piper longipes C.DC.	Unresolved		WCSP (in review)
Piper longipilum C.DC.	Unresolved		WCSP (in review)
Piper longispicum C.DC.	Accepted		WCSP (in review)
Piper longispicum var. boconoense (Trel. & Yunck.) Steyerm.	Synonym		TRO
Piper longispicum var. glabratum (Yunck.) Steyerm.	Accepted		WCSP (in review)
Piper longistigmum C.DC.	Unresolved		WCSP (in review)
Piper longistipulum C. DC.	Synonym		TRO
Piper longivaginans C.DC.	Unresolved		WCSP (in review)
Piper longovarium C.DC.	Unresolved		WCSP (in review)
Piper longum L.	Accepted		TRO
Piper lorentzii Trel.	Synonym		TRO
Piper loretoanum Trel.	Accepted		TRO
Piper losoense Trel. & Yunck.	Unresolved		WCSP (in review)
Piper lowong Blume	Unresolved		WCSP (in review)
Piper loxense (Kunth) Poir.	Synonym		WCSP (in review)
Piper lucaeanum Kunth	Synonym		TRO
Piper lucaeanum var. magnifolium C.DC.	Synonym		WCSP (in review)
Piper lucbanense C.DC.	Unresolved		WCSP (in review)
Piper lucigaudens C. DC.	Accepted		TRO
Piper lucigaudens var. alleni (Trel.) Yunck.	Accepted		TRO
Piper lunare D.Dietr.	Unresolved		WCSP (in review)
Piper lundellianum Trel.	Synonym		TRO
Piper lundellii Trel.	Synonym		TRO
Piper lundelliifolium Standl.	Unresolved		TRO
Piper lundii C.DC.	Accepted		WCSP (in review)
Piper lunulibracteatum C. DC.	Accepted		TRO
Piper luridispicum Trel.	Synonym		TRO
Piper luschnathianum (Kunth) Kunth ex B.D.Jacks.	Synonym		WCSP (in review)
Piper luschnathianum Kunth	Synonym		TRO
Piper luteobaccum Trel.	Unresolved		WCSP (in review)
Piper lutescens C.DC.	Unresolved		WCSP (in review)
Piper luxii C. DC.	Synonym		TRO
Piper luzonense C.DC.	Unresolved		WCSP (in review)
Piper maagnasanum C.DC.	Unresolved		WCSP (in review)
Piper macapaense Yunck.	Unresolved		WCSP (in review)
Piper macbrideanum Trel.	Accepted		TRO
Piper macedoi Yunck.	Accepted		TRO
Piper macerispicum Trel. & Yunck.	Accepted		TRO
Piper macgillivrayi C.DC. ex Seem.	Unresolved		WCSP (in review)
Piper macgillivrayi var. glabrum C. DC.	Synonym		TRO
Piper macgregorii C.DC.	Unresolved		WCSP (in review)
Piper machadoanum C. DC.	Synonym		TRO
Piper machadoense C.DC.	Unresolved		WCSP (in review)
Piper machucanum Trel.	Synonym		TRO
Piper machupicchuense Trel.	Accepted		TRO
Piper macintoshii Trel. & Stehlé	Unresolved		WCSP (in review)
Piper maclurei Merr.	Synonym		TRO
Piper macrocarpum C.DC.	Unresolved		WCSP (in review)
Piper macrophyllum Kunth [Illegitimate]	Synonym		WCSP (in review)
Piper macrophyllum Sw.	Synonym		TRO
Piper macrophyllum Cham. & Schltdl.	Synonym		TRO
Piper macropiper Pennant	Accepted		WCSP (in review)
Piper macropodum C. DC.	Accepted		TRO
Piper macropunctatum Yunck.	Synonym		TRO
Piper macrorhizum Poir.	Unresolved		WCSP (in review)
Piper macrorhynchon (Miq.) C. DC.	Accepted		TRO
Piper macrostachyon Vahl	Synonym		WCSP (in review)
Piper macrostachyum (C. Presl) C. DC.	Accepted		TRO
Piper macrostylum C.DC.	Unresolved		WCSP (in review)
Piper macrotrichum C. DC.	Accepted		TRO
Piper macrourum Kunth	Synonym		TRO
Piper maculatum Blume	Unresolved		WCSP (in review)
Piper maculosum L.	Synonym		WCSP (in review)
Piper madagascariense C.DC.	Unresolved		WCSP (in review)
Piper madagascariensis (Miq.) C. DC.	Accepted		TRO
Piper madeiranum Yunck.	Unresolved		WCSP (in review)
Piper madidum Y.Q. Tseng	Synonym		TRO
Piper maestranum Trel.	Synonym		TRO
Piper magallanesanum C.DC.	Unresolved		WCSP (in review)
Piper magicum Reinw. ex Miq.	Unresolved		WCSP (in review)
Piper magnantherum C. DC.	Accepted		TRO
Piper magnibaccum C.DC.	Unresolved		WCSP (in review)
Piper magnificum Gentil	Synonym		TRO
Piper magnificum Trel.	Accepted		TRO
Piper magnifolium (C. DC.) Trel.	Synonym		TRO
Piper magnilimbum C. DC.	Synonym		TRO
Piper magnipedunculum C.DC.	Unresolved		WCSP (in review)
Piper magnispicum C.DC.	Unresolved		WCSP (in review)
Piper magnoliifolium Jacq.	Synonym		WCSP (in review)
Piper maguirei Yunck.	Synonym		TRO
Piper maingayi Hook.f.	Unresolved		WCSP (in review)
Piper majusculum Blume	Accepted		WCSP (in review)
Piper makruense C.DC.	Unresolved		WCSP (in review)
Piper malabarense C.DC.	Unresolved		WCSP (in review)
Piper malaccense C.DC.	Unresolved		WCSP (in review)
Piper malacocarpum K.Schum. & Lauterb.	Unresolved		WCSP (in review)
Piper malacophyllum (C.Presl) C.DC.	Accepted		WCSP (in review)
Piper malaganum C.DC.	Unresolved		WCSP (in review)
Piper malamiri Blume	Unresolved		WCSP (in review)
Piper malamiris L.	Unresolved		WCSP (in review)
Piper malamiris Roxb.	Unresolved		WCSP (in review)
Piper malanganum Trel.	Unresolved		WCSP (in review)
Piper malarayatense C.DC.	Unresolved		WCSP (in review)
Piper malifolium Trel.	Accepted		TRO
Piper malindangense C.DC.	Unresolved		WCSP (in review)
Piper malmoris Wall.	Unresolved		WCSP (in review)
Piper malpasoensis Tebbs	Unresolved		TRO
Piper mamorense Yunck.	Unresolved		WCSP (in review)
Piper manabinum C. DC.	Accepted		TRO
Piper mananthum C.Wright	Unresolved		WCSP (in review)
Piper manausense Yunck.	Unresolved		WCSP (in review)
Piper mandinganum Trel. & Yunck.	Synonym		TRO
Piper mandonii C. DC.	Synonym		TRO
Piper manillanum Miq.	Unresolved		WCSP (in review)
Piper mannii C.DC.	Unresolved		WCSP (in review)
Piper mansericheanum Trel.	Accepted		TRO
Piper manzanillanum C.DC.	Unresolved		WCSP (in review)
Piper mapirense C. DC.	Accepted		TRO
Piper mapirense var. magnifolium C. DC.	Synonym		TRO
Piper maraccasense Trel.	Unresolved		WCSP (in review)
Piper maranyonense Trel.	Accepted		TRO
Piper maravalanum Trel.	Unresolved		WCSP (in review)
Piper marcescentispicum Trel.	Synonym		TRO
Piper marcoanum C.DC.	Unresolved		WCSP (in review)
Piper marequitense C. DC.	Accepted		TRO
Piper margaretae Trel.	Synonym		TRO
Piper margaritanum C. DC.	Synonym		TRO
Piper margaritatum Trel.	Accepted		TRO
Piper margaritiferum Bertero ex Steud.	Unresolved		WCSP (in review)
Piper marginatibaccum Trel.	Synonym		TRO
Piper marginatihaccum Trel.	Unresolved		WCSP (in review)
Piper marginatum Jacq.	Accepted		WCSP (in review)
Piper marginatum var. anisatum (Kunth) C.DC.	Synonym		WCSP (in review)
Piper marginatum var. catalpaefolium (Kunth) C. DC.	Synonym		TRO
Piper marginatum f. catalpaefolium (Kunth) Steyerm.	Accepted		TRO
Piper marginatum var. clausum Yunck.	Synonym		TRO
Piper marginatum var. marginatum	Accepted		TRO
Piper marginatum var. niceforoi (Trel. & Yunck.) Steyerm.	Accepted		WCSP (in review)
Piper marianum Opiz	Synonym		TRO
Piper maritimum Blume ex C.DC.	Unresolved		WCSP (in review)
Piper marivelesanum C.DC.	Unresolved		WCSP (in review)
Piper marmoreum Trel.	Synonym		TRO
Piper marowinianum C. DC.	Synonym		TRO
Piper marowynense C. DC.	Synonym		TRO
Piper marsupiatum Trel. & Yunck.	Synonym		TRO
Piper marsupiiferum Trel.	Accepted		TRO
Piper martensianum C. DC.	Accepted		TRO
Piper martianum (Kunth) Kunth ex C. DC.	Accepted		TRO
Piper martinense Trel.	Accepted		TRO
Piper martinicense C.DC.	Unresolved		WCSP (in review)
Piper martinii C. DC.	Synonym		TRO
Piper marturetense Trel. & Yunck.	Accepted		WCSP (in review)
Piper mas Trel.	Synonym		TRO
Piper mascarena C. DC.	Unresolved		TRO
Piper mascarense D.Dietr.	Unresolved		WCSP (in review)
Piper masiseanum Trel.	Synonym		TRO
Piper massiei C.DC.	Unresolved		WCSP (in review)
Piper mastersianum C.DC.	Unresolved		WCSP (in review)
Piper matangaum C.DC.	Unresolved		WCSP (in review)
Piper maternale Trel.	Synonym		TRO
Piper mathewsii C. DC.	Accepted		TRO
Piper matinanum C. DC.	Synonym		TRO
Piper matthewii Dunn	Synonym		TRO
Piper matudae Lundell	Unresolved		WCSP (in review)
Piper mauritianum Schult.	Unresolved		WCSP (in review)
Piper maxonii C. DC.	Accepted		TRO
Piper maxonii var. varium (Trel.) Yunck.	Synonym		TRO
Piper maxwellanum C.DC.	Unresolved		WCSP (in review)
Piper mayanum Lundell	Synonym		TRO
Piper maynasianum C. DC.	Synonym		TRO
Piper maypurense (Kunth) Poir.	Synonym		WCSP (in review)
Piper mazamariense Yunck.	Accepted		TRO
Piper mcvaughii Bornst.	Unresolved		WCSP (in review)
Piper mearnsii C.DC.	Unresolved		WCSP (in review)
Piper medinaense Yunck.	Unresolved		WCSP (in review)
Piper medinillifolium Quisumb.	Unresolved		WCSP (in review)
Piper mediocre C. DC.	Accepted		TRO
Piper medium Jacq.	Synonym		WCSP (in review)
Piper medium var. ceanothifolium (Kunth) Trel. & Yunck.	Synonym		TRO
Piper medium var. perglabrum Yunck.	Synonym		TRO
Piper meeboldii C.DC.	Unresolved		WCSP (in review)
Piper megalophyllum C. DC.	Synonym		TRO
Piper megalophyllum var. connivens C. DC.	Synonym		TRO
Piper mekongense C. DC.	Synonym		TRO
Piper melanocarpum Ridl.	Unresolved		WCSP (in review)
Piper melanocaulon Quisumb.	Unresolved		WCSP (in review)
Piper melanocladum C. DC.	Accepted		TRO
Piper melanopremnum Trel. & Ekman	Unresolved		WCSP (in review)
Piper melanostachyum C.DC.	Unresolved		WCSP (in review)
Piper melanostictum (Miq.) C. DC.	Accepted		TRO
Piper melastomoides Schltdl. & Cham.	Accepted		TRO
Piper melchior (Sykes) M.A. Jaram.	Accepted		TRO
Piper melendezense Trel.	Synonym		TRO
Piper mellibracteaum Trel.	Accepted		TRO
Piper melula Trel.	Unresolved		WCSP (in review)
Piper membranaceum C.DC.	Unresolved		WCSP (in review)
Piper mendezense Yunck.	Accepted		TRO
Piper meraense Trel. & Yunck.	Synonym		TRO
Piper mercedense Trel.	Accepted		TRO
Piper mercens Yunck.	Unresolved		WCSP (in review)
Piper meritum Trel.	Synonym		TRO
Piper merrillii C.DC.	Unresolved		WCSP (in review)
Piper merrittii C.DC.	Unresolved		WCSP (in review)
Piper mertonii F.M.Bailey	Unresolved		WCSP (in review)
Piper metallicum Hallier f.	Unresolved		WCSP (in review)
Piper metanum Trel. & Yunck.	Accepted		WCSP (in review)
Piper metapalcoensis C. DC.	Accepted		TRO
Piper methysticum L.f.	Unresolved		WCSP (in review)
Piper methysticum Roxb.	Unresolved		WCSP (in review)
Piper methysticum G.Forst.	Unresolved		WCSP (in review)
Piper methysticum var. wichmannii (C. DC.) Lebot	Unresolved		TRO
Piper mexiae Trel. & Yunck.	Accepted		TRO
Piper mexicanum (Miq.) DC.	Accepted		TRO
Piper michelianum C. DC.	Accepted		TRO
Piper micoense Trel.	Synonym		TRO
Piper miconiifolium (Benth.) C. DC.	Synonym		TRO
Piper micrantherum C. DC.	Synonym		TRO
Piper micronesiacum Hosok.	Unresolved		WCSP (in review)
Piper microphyllum (Kunth) Poir.	Synonym		WCSP (in review)
Piper microstachyum Vahl	Synonym		TRO
Piper microstigma (Miq.) C. DC.	Accepted		TRO
Piper middlesexense Trel. ex Standl.	Synonym		TRO
Piper miersinum (Miq.) C. DC.	Accepted		TRO
Piper miersinum var. balsapambae C. DC.	Synonym		TRO
Piper miersinum var. magnifolium C. DC.	Synonym		TRO
Piper miguel-conejoanum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper mikaniaefolium Trel.	Accepted		TRO
Piper mikanianum (Kunth) Steud.	Accepted		TRO
Piper mikanianum f. clausum Yunck.	Synonym		TRO
Piper mikanianum var. peltatum Yunck.	Synonym		TRO
Piper mikanianum var. pilosius C. DC.	Accepted		TRO
Piper mikarianum Steud.	Unresolved		WCSP (in review)
Piper mikii M.Hiroe	Unresolved		WCSP (in review)
Piper milciadesii Trel. & Yunck.	Synonym		TRO
Piper millegranum Yunck.	Accepted		WCSP (in review)
Piper millepunctulatum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper milleri Roem. & Schult.	Synonym		TRO
Piper milleri C. DC.	Synonym		TRO
Piper millii C.DC.	Unresolved		WCSP (in review)
Piper minahassae C.DC. ex Koord.	Unresolved		WCSP (in review)
Piper minasarum Steyerm.	Accepted		WCSP (in review)
Piper mindoense C. DC.	Synonym		TRO
Piper miniatum (Miq.) Blume	Accepted		TRO
Piper miniatum var. hirtellum (Miq.) C. DC.	Accepted		TRO
Piper minus K.Schum. & Lauterb.	Unresolved		WCSP (in review)
Piper minutantherum C.DC.	Unresolved		WCSP (in review)
Piper minute-scabiosum Trel.	Accepted		TRO
Piper minute-scabiosum var. arborescens Trel.	Synonym		TRO
Piper minutipetiolum C.DC.	Unresolved		WCSP (in review)
Piper minutispicum C. DC.	Synonym		TRO
Piper minutistigmum C.DC.	Unresolved		WCSP (in review)
Piper miquelianum C.DC.	Accepted		WCSP (in review)
Piper miquelii C. DC.	Synonym		TRO
Piper mirabile Trel.	Synonym		TRO
Piper miradorense C. DC.	Synonym		TRO
Piper miramarense Trel. & Yunck.	Synonym		TRO
Piper misantlense C. DC.	Accepted		TRO
Piper mischocarpum Y.Q. Tseng	Accepted		TRO
Piper mishuyacuense Trel.	Accepted		TRO
Piper misionesanum C. DC.	Synonym		TRO
Piper mite Ruiz & Pav.	Accepted		TRO
Piper mitifolium Trel.	Accepted		TRO
Piper mituense Trel. & Yunck.	Accepted		TRO
Piper moccomocco Trel.	Accepted		TRO
Piper mocoanum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper modestum (Miq.) C. DC.	Accepted		TRO
Piper moense C.DC.	Unresolved		WCSP (in review)
Piper moense var. xapuryense (C. DC.) Yunck.	Unresolved		TRO
Piper mohomoho C. DC.	Accepted		TRO
Piper molanoi Trel. & Yunck.	Synonym		TRO
Piper molle Poir.	Synonym		TRO
Piper mollicomum (Kunth) Steud.	Accepted		WCSP (in review)
Piper mollicomum Kunth	Unresolved		TRO
Piper mollipilosum C.DC.	Unresolved		WCSP (in review)
Piper mollipilum Yunck.	Synonym		TRO
Piper mollis C. DC.	Unresolved		TRO
Piper mollissimum Blume	Synonym		TRO
Piper molliusculum Sodiro	Accepted		TRO
Piper moluccanum Spreng.	Unresolved		WCSP (in review)
Piper mombachanum C. DC.	Synonym		TRO
Piper monagasense Yunck.	Accepted		WCSP (in review)
Piper monostachion Vell.	Unresolved		WCSP (in review)
Piper monostachyos Poir.	Unresolved		WCSP (in review)
Piper monostachyum (Ruiz & Pav.) Vahl	Synonym		TRO
Piper monostigmum C. DC.	Accepted		TRO
Piper montanum C. DC.	Accepted		TRO
Piper montealegreanum Yunck.	Accepted		WCSP (in review)
Piper monteluctans Trel.	Synonym		TRO
Piper monteverdeanum C.DC.	Unresolved		WCSP (in review)
Piper montium C.DC.	Unresolved		WCSP (in review)
Piper montivagum Ridl.	Unresolved		WCSP (in review)
Piper monurum Trel. & Yunck.	Accepted		TRO
Piper monzonense C. DC.	Accepted		TRO
Piper moraballianum Trel.	Synonym		TRO
Piper morator Trel.	Synonym		TRO
Piper moreletii C.DC.	Unresolved		WCSP (in review)
Piper morelianum Yunck.	Unresolved		WCSP (in review)
Piper morilloi Steyerm.	Accepted		WCSP (in review)
Piper morisonianum C.DC.	Accepted		WCSP (in review)
Piper moritzianum (Miq.) C. DC.	Synonym		TRO
Piper mornicola C.DC.	Unresolved		WCSP (in review)
Piper mosaicum Steyerm.	Accepted		WCSP (in review)
Piper moscopanense Yunck.	Accepted		TRO
Piper mosenii C. DC.	Accepted		TRO
Piper mourae Yunck.	Unresolved		WCSP (in review)
Piper moyobambanum Trel.	Accepted		TRO
Piper mucronatum Rich. ex C.DC.	Unresolved		WCSP (in review)
Piper mucronulatum Blume	Unresolved		WCSP (in review)
Piper muelleri C. DC.	Accepted		TRO
Piper mullesua Buch.-Ham. ex D. Don	Accepted		TRO
Piper mullinodum C.DC.	Unresolved		WCSP (in review)
Piper multiforme Trel. & Yunck.	Unresolved		WCSP (in review)
Piper multimammosum Trel.	Accepted		TRO
Piper multinervium M. Martens & Galeotti	Synonym		TRO
Piper multinervium Trel.	Synonym		TRO
Piper multinervium var. amplum Trel.	Synonym		TRO
Piper multinervium var. flavicans Trel.	Synonym		TRO
Piper multinervium var. hirsuticaule Trel.	Synonym		TRO
Piper multinervium var. kantelolense Trel.	Synonym		TRO
Piper multinervium var. paralense Trel.	Synonym		TRO
Piper multinervium var. peracutum Trel.	Synonym		TRO
Piper multinervium var. productipes Trel.	Synonym		TRO
Piper multinervium var. protractifolium Trel.	Synonym		TRO
Piper multinervium var. puberulipedunculum Trel.	Synonym		TRO
Piper multinervium var. pubescenticaule Trel.	Synonym		TRO
Piper multinervium var. skutchii Trel.	Synonym		TRO
Piper multinervium var. telanum Trel.	Synonym		TRO
Piper multinodum C.DC.	Unresolved		WCSP (in review)
Piper multiplinervium C.DC.	Accepted		WCSP (in review)
Piper multistigmum C.DC.	Unresolved		WCSP (in review)
Piper multitudinis Trel.	Accepted		TRO
Piper multitudinis var. latum Trel.	Synonym		TRO
Piper muluense O.Schwartz	Unresolved		WCSP (in review)
Piper munchanum C.DC.	Accepted		WCSP (in review)
Piper munchanum var. magnifolium C. DC.	Synonym		TRO
Piper mundum Trel.	Accepted		TRO
Piper muneyporense C.DC.	Unresolved		WCSP (in review)
Piper mungpooanum C.DC.	Unresolved		WCSP (in review)
Piper munyanum Trel.	Accepted		TRO
Piper muricatum Blume	Unresolved		WCSP (in review)
Piper murinum Roem. & Schult.	Synonym		TRO
Piper murrayanum C.DC.	Unresolved		WCSP (in review)
Piper muscosum Schult.	Unresolved		WCSP (in review)
Piper musteum Trel.	Accepted		TRO
Piper mutabile C. DC.	Accepted		TRO
Piper mutisii Trel. & Yunck.	Synonym		TRO
Piper myosuroides Rudge	Synonym		WCSP (in review)
Piper myosurus Willd.	Synonym		TRO
Piper myrmecophilum C.DC.	Unresolved		WCSP (in review)
Piper myrtifolia Vahl	Synonym		TRO
Piper mystaciferum Trel.	Synonym		TRO
Piper nagaense C.DC.	Unresolved		WCSP (in review)
Piper nagelii C.DC.	Unresolved		WCSP (in review)
Piper naiguatanum Yunck.	Synonym		WCSP (in review)
Piper nanayanum Trel.	Accepted		TRO
Piper nanegalense Trel. & Yunck.	Synonym		TRO
Piper nanum C. DC.	Synonym		TRO
Piper napo-pastazanum Trel. & Yunck.	Accepted		TRO
Piper naranjoanum C. DC.	Synonym		TRO
Piper narinoense Yunck.	Unresolved		WCSP (in review)
Piper naris-fractae Trel.	Unresolved		TRO
Piper nasutum Trel.	Accepted		TRO
Piper neblinanum Yunck.	Accepted		WCSP (in review)
Piper nebuligaudens Yunck.	Accepted		TRO
Piper neesianum C. DC.	Accepted		TRO
Piper neglectum Trel.	Accepted		TRO
Piper negritosense Trel.	Synonym		TRO
Piper negrosense C.DC.	Unresolved		WCSP (in review)
Piper nematanthera C. DC.	Accepted		TRO
Piper nematanthera var. sagotii (C. DC.) Trel. & Yunck.	Accepted		TRO
Piper nematostachyum (Link) Schult.	Synonym		WCSP (in review)
Piper nemorale C.DC.	Unresolved		WCSP (in review)
Piper nemorense C. DC.	Synonym		TRO
Piper nemorimarginis Trel.	Synonym		TRO
Piper nemorosum Vahl	Synonym		TRO
Piper nepalense Miq.	Synonym		TRO
Piper nephrophyllum Trel. ex T. Alberto	Synonym		TRO
Piper nervosovenosum Blume	Unresolved		WCSP (in review)
Piper neurostachyum C. DC.	Synonym		TRO
Piper nhandi Rich.	Unresolved		WCSP (in review)
Piper niceforoi Trel. & Yunck.	Synonym		WCSP (in review)
Piper niceforoi var. glabricaule Yunck.	Synonym		TRO
Piper nicoyanum C. DC.	Synonym		TRO
Piper nieblyanum C. DC.	Synonym		TRO
Piper nigramentum C.DC.	Unresolved		WCSP (in review)
Piper nigrantherum C.DC.	Unresolved		WCSP (in review)
Piper nigrescens Miq.	Unresolved		WCSP (in review)
Piper nigrescens Blume	Unresolved		WCSP (in review)
Piper nigribaccum C.DC.	Unresolved		WCSP (in review)
Piper nigricans Willd. ex Link	Unresolved		WCSP (in review)
Piper nigricaule Trel.	Synonym		TRO
Piper nigriconnectivum C.DC.	Unresolved		WCSP (in review)
Piper nigrinodum C.DC.	Unresolved		WCSP (in review)
Piper nigrispicum C.DC.	Unresolved		WCSP (in review)
Piper nigro-granulatum Trel.	Synonym		TRO
Piper nigropunctatum C. DC.	Accepted		TRO
Piper nigropunctatum var. franciscoanum C. DC.	Synonym		TRO
Piper nigroramum C.DC.	Unresolved		WCSP (in review)
Piper nigrovirens C.DC.	Unresolved		WCSP (in review)
Piper nigrum L.	Accepted		WCSP (in review)
Piper nigrum var. macrostachyum C. DC.	Synonym		TRO
Piper nilghirianum C.DC.	Unresolved		WCSP (in review)
Piper nirjulianum Gajurel, Rethy & Y.Kumar	Unresolved		WCSP (in review)
Piper niteroiense Yunck.	Unresolved		WCSP (in review)
Piper nitidifolium C. DC.	Synonym		TRO
Piper nitidulifolium Trel.	Synonym		TRO
Piper nitidulilaminum Trel.	Synonym		TRO
Piper nitidulum Opiz	Synonym		TRO
Piper nitidum Sw.	Synonym		WCSP (in review)
Piper nitidum Vahl	Synonym		TRO
Piper nobile C.DC.	Accepted		WCSP (in review)
Piper nobile var. glabratum Yunck.	Synonym		WCSP (in review)
Piper nodosum C. DC.	Synonym		TRO
Piper nodulosum Link	Synonym		TRO
Piper nonconformans Trel.	Synonym		TRO
Piper nonretrorsum Trel.	Synonym		TRO
Piper nottirbanum Trel. ex Stehlé	Unresolved		WCSP (in review)
Piper nottirhanum Trel. ex Stehlé	Unresolved		WCSP (in review)
Piper novae-helvetiae Trel.	Synonym		TRO
Piper novae-hispaniae C.DC.	Unresolved		WCSP (in review)
Piper novae-hispaniae Colla	Unresolved		WCSP (in review)
Piper novae-hollandiae Miq.	Unresolved		WCSP (in review)
Piper noveninervium C.DC.	Unresolved		WCSP (in review)
Piper novo-granatense C. DC.	Synonym		TRO
Piper novogalicianum Bornst.	Unresolved		WCSP (in review)
Piper novoguineense Warb.	Unresolved		WCSP (in review)
Piper nubigaudens Trel.	Synonym		TRO
Piper nubigenum Kunth	Accepted		WCSP (in review)
Piper nudibaccatum Y.Q. Tseng	Accepted		TRO
Piper nudibracteatum C. DC.	Synonym		TRO
Piper nudibracteatum var. micropuberulum Trel. & Yunck.	Synonym		TRO
Piper nudibracteatum var. pubescens Trel. & Yunck.	Synonym		TRO
Piper nudicaule C. DC.	Synonym		TRO
Piper nudifolium C. DC.	Accepted		TRO
Piper nudilimbum C. DC.	Accepted		TRO
Piper nudipedunculum C.DC.	Unresolved		WCSP (in review)
Piper nudiramum C.DC.	Unresolved		WCSP (in review)
Piper nudispicuum C.DC.	Unresolved		WCSP (in review)
Piper nudum C. DC.	Accepted		TRO
Piper nummulariifolium Sw.	Synonym		WCSP (in review)
Piper nummularium Lam.	Synonym		TRO
Piper nuncupatum Trel.	Accepted		TRO
Piper nutans Opiz	Synonym		TRO
Piper nyrtifolium Vahl	Unresolved		WCSP (in review)
Piper oaxacanum C. DC.	Accepted		TRO
Piper obaldianum C. DC.	Synonym		TRO
Piper obatense O.Schwartz	Unresolved		WCSP (in review)
Piper obcordatum Stokes	Unresolved		WCSP (in review)
Piper obesispicum S.Moore	Unresolved		WCSP (in review)
Piper obesum Vahl	Accepted		TRO
Piper obidosanum C. DC. ex Huber	Unresolved		TRO
Piper obitersericeum Trel.	Synonym		TRO
Piper oblanceolatum Trel.	Synonym		TRO
Piper oblanceolatum var. fragilicaule Trel.	Synonym		TRO
Piper oblancifolium Yunck.	Accepted		WCSP (in review)
Piper oblique-ovatum Trel.	Synonym		TRO
Piper obliquum Ruiz & Pav.	Accepted		WCSP (in review)
Piper obliquum (Ruiz & Pav.) Pers.	Unresolved		TRO
Piper obliquum Balb. ex Kunth	Synonym		TRO
Piper obliquum var. eximium (Kunth) C.DC.	Synonym		WCSP (in review)
Piper obliquum var. puberulidrupum Yunck.	Synonym		TRO
Piper oblitum Trel.	Synonym		TRO
Piper oblongatifolium Trel.	Accepted		TRO
Piper oblongatilimbum Trel.	Accepted		TRO
Piper oblongatum Opiz	Accepted		TRO
Piper oblongibaccum C.DC.	Unresolved		WCSP (in review)
Piper oblongifolium (Klotzsch) C. DC.	Accepted		TRO
Piper oblongilimbum C. DC.	Synonym		TRO
Piper oblongum Kunth	Accepted		WCSP (in review)
Piper obloniaefolium C. DC.	Unresolved		TRO
Piper obovantherum C.DC.	Unresolved		WCSP (in review)
Piper obovatibracteum C.DC.	Unresolved		WCSP (in review)
Piper obovatifolium Trel.	Accepted		TRO
Piper obovatilimbum C. DC.	Synonym		TRO
Piper obovatum Ruiz & Pav.	Synonym		TRO
Piper obovatum var. bolivianum C. DC.	Synonym		TRO
Piper obrumbatum C. DC.	Synonym		TRO
Piper obrutum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper obscurum C.DC.	Unresolved		WCSP (in review)
Piper obsessum Trel.	Synonym		TRO
Piper obtusifolium L.	Synonym		WCSP (in review)
Piper obtusilimbum C. DC.	Accepted		TRO
Piper obtusissimum Miq.	Unresolved		WCSP (in review)
Piper obtusistigmum C.DC.	Unresolved		WCSP (in review)
Piper obtusum C.DC.	Unresolved		WCSP (in review)
Piper obumbratifolium Trel.	Synonym		TRO
Piper obumbratum (Miq.) C.DC.	Synonym		WCSP (in review)
Piper obversum Vahl	Unresolved		WCSP (in review)
Piper occultum Trel.	Unresolved		WCSP (in review)
Piper ocoanum Trel.	Unresolved		WCSP (in review)
Piper oculatiopicum Trel.	Unresolved		TRO
Piper oculatispicum Trel.	Accepted		TRO
Piper odoratum C.DC.	Unresolved		WCSP (in review)
Piper oerstedii C. DC.	Synonym		TRO
Piper offensum Trel.	Accepted		TRO
Piper officinarum (Miq.) C. DC.	Synonym		TRO
Piper okamotoi M.Hiroe	Unresolved		WCSP (in review)
Piper oldhamii C.DC.	Unresolved		WCSP (in review)
Piper olens C.DC.	Unresolved		WCSP (in review)
Piper olfersianum Kunth	Unresolved		WCSP (in review)
Piper olivaceum C. DC.	Synonym		TRO
Piper ollantaitambanum Trel.	Accepted		TRO
Piper omega Trel.	Synonym		TRO
Piper onerosum Trel.	Synonym		TRO
Piper onus Trel.	Synonym		TRO
Piper ootacamundense C.DC.	Unresolved		WCSP (in review)
Piper opacibracteum Trel.	Synonym		TRO
Piper opacilimbum C.DC.	Unresolved		WCSP (in review)
Piper oparumaense Yunck.	Synonym		WCSP (in review)
Piper operosum Trel.	Synonym		TRO
Piper opinatum Trel.	Synonym		TRO
Piper opizianum (A. Dietr.) D. Dietr.	Synonym		TRO
Piper opizianum Fuernr.	Accepted		TRO
Piper opizii (Kunth) Steud.	Accepted		TRO
Piper oppressum Trel.	Synonym		TRO
Piper oradendron Trel. & Standl.	Accepted		TRO
Piper orbiculatum Poir.	Unresolved		WCSP (in review)
Piper orbiculatum Spreng.	Unresolved		WCSP (in review)
Piper orenocanum C.DC.	Synonym		WCSP (in review)
Piper oreophilum Ridl.	Unresolved		WCSP (in review)
Piper orizabanum C. DC.	Accepted		TRO
Piper ornatispicum Trel.	Synonym		TRO
Piper ornatum N.E.Br.	Unresolved		WCSP (in review)
Piper ornithorhynchum Trel.	Accepted		TRO
Piper oroense Yunck.	Accepted		TRO
Piper orosianum Trel.	Synonym		TRO
Piper orthostachyum Kunth	Synonym		TRO
Piper ossanum Trel.	Unresolved		WCSP (in review)
Piper ostii Trel.	Accepted		TRO
Piper otophorum C. DC.	Accepted		TRO
Piper otophyllum C.DC.	Unresolved		WCSP (in review)
Piper otto-huberi Steyerm.	Accepted		WCSP (in review)
Piper ottoniifolium C. DC.	Accepted		TRO
Piper ottoniifolium var. frutescens Trel. & Yunck.	Synonym		TRO
Piper ottoniifolium var. latifolium Trel. & Yunck.	Synonym		TRO
Piper ottonis (Miq.) C. DC.	Synonym		TRO
Piper ottonoides Yunck.	Unresolved		WCSP (in review)
Piper ovale C. DC.	Synonym		TRO
Piper ovalifolium C. DC.	Synonym		TRO
Piper ovantherum C. DC.	Accepted		TRO
Piper ovatibaccum C.DC.	Unresolved		WCSP (in review)
Piper ovatifolium Yunck.	Synonym		TRO
Piper ovatilimbum C.DC.	Unresolved		WCSP (in review)
Piper ovatistigmum C.DC.	Unresolved		WCSP (in review)
Piper ovatoacuminatum C.DC.	Unresolved		WCSP (in review)
Piper ovatostemon C.DC.	Unresolved		WCSP (in review)
Piper ovatum Vahl	Accepted		WCSP (in review)
Piper ovatum var. bolivianum C. DC.	Synonym		TRO
Piper oviedoi Urb.	Unresolved		WCSP (in review)
Piper oxycarpum C.DC.	Unresolved		WCSP (in review)
Piper oxyphyllum C.DC.	Unresolved		WCSP (in review)
Piper oxystachyum C.DC.	Unresolved		WCSP (in review)
Piper pablense Trel.	Synonym		TRO
Piper pabstii C. DC.	Synonym		TRO
Piper pacacanum Trel.	Synonym		TRO
Piper pachoanum C. DC.	Accepted		TRO
Piper pachyarthrum K.Schum.	Unresolved		WCSP (in review)
Piper pachyphloium C.DC.	Unresolved		WCSP (in review)
Piper pachypholium C.DC. ex Kuntze	Unresolved		WCSP (in review)
Piper pachyphyllum Sodiro	Synonym		TRO
Piper pachystachyon C. DC.	Synonym		TRO
Piper pachystylum Trel.	Synonym		TRO
Piper padangense C.DC.	Unresolved		WCSP (in review)
Piper padifolium (Kunth) C. DC.	Accepted		TRO
Piper paezanum C. DC.	Synonym		TRO
Piper paganicum Trel.	Accepted		TRO
Piper paitense Schltr.	Unresolved		WCSP (in review)
Piper palauense Hosok.	Unresolved		WCSP (in review)
Piper palawanum C.DC.	Unresolved		WCSP (in review)
Piper palestinanum Trel. & Yunck.	Accepted		WCSP (in review)
Piper pallens Poir.	Unresolved		WCSP (in review)
Piper pallescens C.DC.	Synonym		WCSP (in review)
Piper pallidibracteum C. DC.	Synonym		TRO
Piper pallididorsum Trel.	Accepted		TRO
Piper pallidifolium C. DC.	Synonym		TRO
Piper pallidilimbum C.DC.	Unresolved		WCSP (in review)
Piper pallidirameum C. DC.	Synonym		TRO
Piper pallidirameum var. subcrassifolium C. DC.	Synonym		TRO
Piper pallidirameum var. sublongirameum C. DC.	Synonym		TRO
Piper pallidirubrum C.DC.	Unresolved		WCSP (in review)
Piper pallidum G.Forst.	Unresolved		WCSP (in review)
Piper pallidum Salisb.	Unresolved		WCSP (in review)
Piper pallidum Van Heurck & Müll.Arg.	Unresolved		WCSP (in review)
Piper palmanum Trel.	Synonym		TRO
Piper palmasanum C. DC.	Synonym		TRO
Piper palmeri C.DC.	Unresolved		WCSP (in review)
Piper paludicola Trel. ex Yunck.	Synonym		TRO
Piper paludosum C. DC.	Accepted		TRO
Piper palustre C. DC.	Synonym		TRO
Piper pamploanum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper panamense C. DC.	Synonym		TRO
Piper pandoense Yunck.	Unresolved		WCSP (in review)
Piper panduratum C.DC.	Unresolved		WCSP (in review)
Piper pangoense C. DC.	Synonym		TRO
Piper pansamalanum C. DC.	Synonym		TRO
Piper pantjarense C.DC.	Unresolved		WCSP (in review)
Piper papantlense C. DC.	Synonym		TRO
Piper papillicarpum Trel.	Synonym		TRO
Piper papillicaule Trel. & Yunck.	Accepted		TRO
Piper papilliferum Steyerm.	Accepted		WCSP (in review)
Piper papillipetiolatum Trel.	Synonym		TRO
Piper papulaecaule Trel.	Synonym		TRO
Piper papulatum Trel.	Synonym		TRO
Piper papyraceum Trel.	Synonym		TRO
Piper paracaimanum C.DC.	Unresolved		WCSP (in review)
Piper paraense (Miq.) C. DC.	Accepted		TRO
Piper paraguassuanum C.DC.	Unresolved		WCSP (in review)
Piper paraguayense D.Parodi	Unresolved		WCSP (in review)
Piper paraisense Trel.	Accepted		TRO
Piper paralaevigatum Trel.	Accepted		TRO
Piper paramaribense C. DC.	Accepted		TRO
Piper paramattense C.DC.	Unresolved		WCSP (in review)
Piper paranapuranum Trel.	Synonym		TRO
Piper paranum Yunck.	Accepted		WCSP (in review)
Piper parapeltobryon Trel.	Accepted		WCSP (in review)
Piper parcepilosum Trel.	Synonym		TRO
Piper parcipilum C.DC.	Unresolved		WCSP (in review)
Piper parcirameum C.DC.	Unresolved		WCSP (in review)
Piper parcum Trel. & Yunck.	Accepted		TRO
Piper pardinum C. DC.	Synonym		TRO
Piper parianum Yunck.	Accepted		WCSP (in review)
Piper parimanum Trel.	Synonym		WCSP (in review)
Piper parkerianum (Miq.) C.DC.	Synonym		WCSP (in review)
Piper parmatum Dressler	Accepted		TRO
Piper parong Quisumb.	Unresolved		WCSP (in review)
Piper parryanum Trel.	Unresolved		WCSP (in review)
Piper parthenium Mart.	Synonym		TRO
Piper parthenium C. DC.	Synonym		TRO
Piper parthenium var. pilosius C. DC.	Synonym		TRO
Piper partiticuspe Trel.	Synonym		TRO
Piper parvantherum C.DC.	Unresolved		WCSP (in review)
Piper parvibracteatum C.DC.	Unresolved		WCSP (in review)
Piper parvicordulatum Trel.	Accepted		TRO
Piper parvifolium Blanco	Unresolved		WCSP (in review)
Piper parvilimbum C.DC.	Unresolved		WCSP (in review)
Piper parvipedunculum C.DC.	Unresolved		WCSP (in review)
Piper parvipetiolum C.DC.	Unresolved		WCSP (in review)
Piper parvispica C.DC.	Unresolved		WCSP (in review)
Piper parvulum M. Martens & Galeotti	Synonym		TRO
Piper paso-anchoense Trel.	Synonym		TRO
Piper pastasanum Diels	Accepted		TRO
Piper pastasanum f. impilosum Diels	Synonym		TRO
Piper pastasanum f. intermedium Diels	Synonym		TRO
Piper pastasanum f. pleiotrichum Diels	Synonym		TRO
Piper pastoense C. DC.	Synonym		TRO
Piper patens Opiz	Accepted		TRO
Piper patentifolium Trel.	Accepted		TRO
Piper patulipilum Yunck.	Synonym		WCSP (in review)
Piper patulum Bertol.	Synonym		TRO
Piper patulum M. Martens & Galeotti	Synonym		TRO
Piper patulum var. cordifolium Trel.	Synonym		TRO
Piper patzulinum Trel. & Standl.	Unresolved		WCSP (in review)
Piper paucartamboanum Trel.	Accepted		TRO
Piper paucartamhoanum Trel.	Unresolved		WCSP (in review)
Piper paucinerve C.DC.	Unresolved		WCSP (in review)
Piper paucipilosum Yunck.	Unresolved		WCSP (in review)
Piper pauciramosum Yunck.	Unresolved		WCSP (in review)
Piper paucistigmum C.DC.	Unresolved		WCSP (in review)
Piper paulianifolium Trel.	Accepted		TRO
Piper paulianum C.DC.	Unresolved		WCSP (in review)
Piper paulownifolium C. DC.	Synonym		TRO
Piper pavasense Steyerm. [Illegitimate]	Synonym		WCSP (in review)
Piper pavasense Trel.	Synonym		TRO
Piper pavimentifolium Trel.	Unresolved		WCSP (in review)
Piper pavonii (Miq.) C.DC.	Accepted		WCSP (in review)
Piper pearcei Yunck.	Unresolved		WCSP (in review)
Piper pebasense Trel.	Accepted		TRO
Piper peculiare Trel. & Yunck.	Unresolved		WCSP (in review)
Piper pedicellare C. DC.	Synonym		TRO
Piper pedicellatum C. DC.	Accepted		TRO
Piper pedicellosum Wall.	Unresolved		WCSP (in review)
Piper pedunculare (Miq.) C. DC.	Accepted		TRO
Piper pedunculatum C. DC.	Synonym		TRO
Piper peekelii C.DC.	Synonym		WCSP (in review)
Piper peepuloides Wall.	Unresolved		WCSP (in review)
Piper peepuloides Roxb.	Unresolved		WCSP (in review)
Piper pejivallense Trel.	Synonym		TRO
Piper pelliticaule Trel.	Synonym		TRO
Piper pellitum C. DC.	Accepted		TRO
Piper pellucidum L.	Synonym		WCSP (in review)
Piper peltaphyllum C. DC.	Synonym		TRO
Piper peltaphyllum var. lasvueltasanum C. DC.	Synonym		TRO
Piper peltatum L.	Accepted		WCSP (in review)
Piper peltatum Ruiz & Pav.	Unresolved		TRO
Piper peltatum var. colombianum C. DC.	Synonym		TRO
Piper peltilimbum Yunck.	Unresolved		WCSP (in review)
Piper peltobryon C.DC.	Synonym		WCSP (in review)
Piper peltoideum (Kunth) Poir.	Synonym		TRO
Piper penangense (Miq.) C. DC.	Accepted		TRO
Piper pendens Trel.	Synonym		TRO
Piper pendens var. infaustum Trel.	Synonym		TRO
Piper pendentispicum Trel. & Yunck.	Accepted		WCSP (in review)
Piper pendentispicum var. furcatipilosum (Yunck.) Steyerm.	Accepted		WCSP (in review)
Piper pendentispicum var. tejamesmeanum Trel. & Yunck.	Synonym		TRO
Piper pendulifolium C.DC.	Unresolved		WCSP (in review)
Piper pendulirameum Trel. & Yunck.	Accepted		TRO
Piper pendulispicum C.DC.	Unresolved		WCSP (in review)
Piper pendulum Willd. ex Schult.	Unresolved		WCSP (in review)
Piper pendulum Warb.	Unresolved		WCSP (in review)
Piper pennellii Trel. & Yunck.	Synonym		TRO
Piper penninerve C.DC.	Unresolved		WCSP (in review)
Piper pentagonum Trel.	Synonym		TRO
Piper pentandrum C.DC.	Unresolved		WCSP (in review)
Piper penyasense Trel. & Yunck.	Unresolved		WCSP (in review)
Piper peploides (Kunth) Poir.	Synonym		TRO
Piper peracuminatum C. DC.	Accepted		TRO
Piper peracutilimbum C.DC.	Unresolved		WCSP (in review)
Piper perareolatum C. DC.	Accepted		TRO
Piper peraromaticum C.DC.	Unresolved		WCSP (in review)
Piper perbarbatum C.DC.	Unresolved		WCSP (in review)
Piper perbrevicaule Yunck.	Accepted		TRO
Piper perbrevicaule var. subglabrilimbum Yunck.	Synonym		TRO
Piper perbrevispicum Yunck.	Unresolved		WCSP (in review)
Piper perciliatum Trel. & Yunck.	Accepted		WCSP (in review)
Piper percome Trel.	Synonym		TRO
Piper percostatum Yunck.	Unresolved		WCSP (in review)
Piper perenense Trel.	Accepted		TRO
Piper pereskiifolium Jacq.	Synonym		WCSP (in review)
Piper perforatum D.Dietr.	Unresolved		WCSP (in review)
Piper perfugii Trel.	Synonym		TRO
Piper pergamentifolium Trel. & Standl.	Synonym		TRO
Piper pergeniculatum Trel.	Synonym		TRO
Piper perhispidum C. DC.	Accepted		TRO
Piper perijaense Steyerm.	Accepted		WCSP (in review)
Piper perinaequilongum Trel.	Synonym		TRO
Piper perlasense Yunck.	Synonym		TRO
Piper perlongipedunculum Trel. & Standl.	Unresolved		WCSP (in review)
Piper perlongipes Trel.	Synonym		TRO
Piper perlongispicum Yunck.	Synonym		WCSP (in review)
Piper perlongivillosum Yunck.	Synonym		WCSP (in review)
Piper permari Trel.	Synonym		TRO
Piper permolle Trel. & Yunck.	Accepted		TRO
Piper permucronatum Yunck.	Unresolved		WCSP (in review)
Piper pernigricans Trel.	Accepted		TRO
Piper pernodosum Yunck.	Unresolved		WCSP (in review)
Piper pernodulosum Trel. & Yunck.	Synonym		TRO
Piper perobumbratum Trel.	Synonym		TRO
Piper perpallidum Ekman, Urb. & Trel.	Unresolved		WCSP (in review)
Piper perpilibracteum Yunck.	Synonym		TRO
Piper perpilosum C.DC.	Unresolved		WCSP (in review)
Piper perpuberulum Trel.	Synonym		TRO
Piper perpunctatum C.DC.	Unresolved		WCSP (in review)
Piper perpunctulatum Trel.	Accepted		TRO
Piper perpurgatum Trel.	Accepted		TRO
Piper perpusillum Callejas	Unresolved		WCSP (in review)
Piper perrottetii C.DC.	Unresolved		WCSP (in review)
Piper perscabrifolium Yunck.	Unresolved		WCSP (in review)
Piper persicariifolium Kunth	Unresolved		WCSP (in review)
Piper perspicuibracteum Trel.	Synonym		TRO
Piper perstipulare Steyerm.	Accepted		WCSP (in review)
Piper perstrigosum Yunck.	Accepted		TRO
Piper persubulatum C. DC.	Accepted		TRO
Piper pertiactatum Trel.	Unresolved		WCSP (in review)
Piper pertinax Trel. & Yunck.	Accepted		TRO
Piper pertomentellum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper pertractatum Trel.	Synonym		TRO
Piper peruligerum Trel.	Accepted		TRO
Piper peruvianum (Miq.) C. DC.	Accepted		TRO
Piper pervelutinum Trel.	Accepted		TRO
Piper pervenosum C. DC. ex L.J. Schroeder	Accepted		TRO
Piper pervenulosum Yunck.	Synonym		WCSP (in review)
Piper perverrucosum Trel. & Yunck.	Accepted		WCSP (in review)
Piper pervicax Trel.	Synonym		TRO
Piper pervillosum Trel.	Synonym		TRO
Piper pervulgatum Trel.	Accepted		TRO
Piper pervulsum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper pesaresanum C. DC.	Synonym		TRO
Piper petaresanum C.DC.	Unresolved		WCSP (in review)
Piper petiolare C.DC.	Unresolved		WCSP (in review)
Piper petiolatum C.DC.	Unresolved		WCSP (in review)
Piper petiolatum Hook.f.	Unresolved		WCSP (in review)
Piper pexum Trel.	Synonym		TRO
Piper phaeophyllum Trel. & Standl.	Synonym		TRO
Piper phalangense C.DC.	Unresolved		WCSP (in review)
Piper phanerolepidum Trel.	Synonym		TRO
Piper phaneropus Trel.	Unresolved		WCSP (in review)
Piper phegophyllum Trel.	Synonym		TRO
Piper philippinense C.DC.	Unresolved		WCSP (in review)
Piper philippinum Miq.	Accepted		TRO
Piper philodendmn Ridl.	Unresolved		WCSP (in review)
Piper philodendroides Standl. & Steyerm.	Unresolved		WCSP (in review)
Piper photomorphe C. DC.	Accepted		TRO
Piper phthinotrichon (Miq.) C. DC.	Synonym		TRO
Piper phthinotrichon var. sanroqueanum Trel.	Synonym		TRO
Piper phuwuaense Chaveer. & Tanee	Unresolved		WCSP (in review)
Piper phyllanthus Willd. ex A.Dietr.	Unresolved		WCSP (in review)
Piper phyllostictum (Miq.) C. DC.	Accepted		TRO
Piper phytolaccifolium Opiz	Accepted		WCSP (in review)
Piper phytolaccifolium var. carabobense (C.DC.) Steyerm.	Accepted		WCSP (in review)
Piper phytolaccifolium var. peltobryon (C.DC.) Trel. & Yunck.	Synonym		WCSP (in review)
Piper phytolaccifolium f. peltobryon (C.DC.) Steyerm.	Synonym		WCSP (in review)
Piper picardae C.DC.	Unresolved		WCSP (in review)
Piper picardae var. pilinervium Trel.	Synonym		TRO
Piper pichisense Trel.	Synonym		TRO
Piper picobonitoense F.G. Coe & Bornst.	Unresolved		TRO
Piper pictamentum Trel.	Synonym		TRO
Piper pictamentum var. fluminis Trel.	Synonym		TRO
Piper piedadesense Trel.	Synonym		TRO
Piper piedecuestanum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper pierrei C. DC.	Synonym		TRO
Piper pileatum Trel.	Synonym		TRO
Piper pileatum var. obliquum Trel.	Synonym		TRO
Piper pilgeri C.DC.	Accepted		WCSP (in review)
Piper pilibaccum C. DC.	Synonym		TRO
Piper pilibracteum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper pilinervium C. DC.	Synonym		TRO
Piper pilipedunculum C.DC.	Unresolved		WCSP (in review)
Piper pilipes C.DC.	Unresolved		WCSP (in review)
Piper pilirameum C. DC.	Synonym		TRO
Piper pilirameum f. b C. DC.	Synonym		TRO
Piper pilirameum var. subglabrum Yunck.	Synonym		TRO
Piper pilispicum C.DC.	Unresolved		WCSP (in review)
Piper pilobracteatum Chaveer. & Sudmoon	Unresolved		WCSP (in review)
Piper pilosissimum Yunck.	Accepted		TRO
Piper pilosiusculum Opiz	Synonym		TRO
Piper pilosulinodum C.DC.	Unresolved		WCSP (in review)
Piper pilosum (Ruiz & Pav.) Vahl	Synonym		TRO
Piper pilovarium Yunck.	Accepted		TRO
Piper piluliferifolium Trel. & Yunck.	Unresolved		WCSP (in review)
Piper piluliferum Kunth	Accepted		TRO
Piper pinaresanum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper pinedoana Trel.	Accepted		TRO
Piper pinetorum Standl. & Steyerm.	Unresolved		WCSP (in review)
Piper pingbienense Y.Q. Tseng	Accepted		TRO
Piper pinguifolium C. DC.	Accepted		TRO
Piper pinguispicum C.DC. & Koord.	Unresolved		WCSP (in review)
Piper pinoganense Trel.	Accepted		TRO
Piper pinuna-negroense Trel. & Yunck.	Unresolved		WCSP (in review)
Piper piojoanum Trel. & Yunck.	Accepted		TRO
Piper piritubanum Yunck.	Synonym		TRO
Piper piscatorum Trel. & Yunck.	Accepted		WCSP (in review)
Piper pisoense C. DC.	Synonym		TRO
Piper pitalitoense Yunck.	Unresolved		WCSP (in review)
Piper pitanum C. DC.	Synonym		TRO
Piper pittieri C. DC.	Accepted		TRO
Piper plagiocladum C. DC.	Synonym		TRO
Piper plagiophyllum K.Schum. & Lauterb.	Unresolved		WCSP (in review)
Piper planifolium Poir.	Unresolved		WCSP (in review)
Piper planipes Trel.	Accepted		TRO
Piper planitiei Trel. & Yunck.	Unresolved		WCSP (in review)
Piper plantagineum Lam.	Synonym		WCSP (in review)
Piper plantaginifolium D.Dietr.	Unresolved		WCSP (in review)
Piper platannanum Trel.	Unresolved		WCSP (in review)
Piper platylobum Sodiro	Accepted		TRO
Piper platyphyllum (Benth.) C. DC.	Accepted		TRO
Piper playa-blancanum Trel.	Synonym		TRO
Piper pleiocarpum C.C. Chang ex Y.Q. Tseng	Accepted		TRO
Piper pleninervosum Trel.	Synonym		TRO
Piper plicatum D.Dietr.	Unresolved		WCSP (in review)
Piper plukenetianum C.DC.	Unresolved		WCSP (in review)
Piper plumbeicolor Trel.	Synonym		TRO
Piper plurinervosum Yunck.	Accepted		WCSP (in review)
Piper poasanum C. DC.	Accepted		TRO
Piper podandrum C.DC.	Unresolved		WCSP (in review)
Piper poeppigii (Klotzsch) C. DC.	Synonym		TRO
Piper poeppigii (Kunth) Steud.	Synonym		TRO
Piper poeppiguum C. DC.	Unresolved		TRO
Piper pogonioneuron Trel. & Standl.	Unresolved		WCSP (in review)
Piper pohlianum (Miq.) C. DC.	Accepted		TRO
Piper poiretianum C.DC.	Unresolved		WCSP (in review)
Piper poiteanum Steud.	Synonym		WCSP (in review)
Piper poiteanum Kunth	Synonym		TRO
Piper polisanum C.DC.	Unresolved		WCSP (in review)
Piper politaereum Trel.	Accepted		TRO
Piper politifolium C.DC.	Unresolved		WCSP (in review)
Piper politii Yunck.	Accepted		WCSP (in review)
Piper politum C. DC.	Accepted		TRO
Piper polybotryon Spreng.	Synonym		TRO
Piper polybotryum Poir.	Synonym		TRO
Piper polybotryum Roem. & Schult.	Synonym		TRO
Piper polycarpum Ridl.	Unresolved		WCSP (in review)
Piper polycladum C.DC.	Unresolved		WCSP (in review)
Piper polygynum C.DC.	Unresolved		WCSP (in review)
Piper polyneurum C. DC. ex A. Schroed.	Synonym		TRO
Piper polystachyon Aiton	Unresolved		WCSP (in review)
Piper polystachyum C.DC.	Unresolved		WCSP (in review)
Piper polysyphonum C. DC.	Accepted		TRO
Piper polytrichum C.DC.	Unresolved		WCSP (in review)
Piper ponapense C.DC.	Unresolved		WCSP (in review)
Piper ponendum Trel.	Synonym		TRO
Piper ponesheense C. DC.	Accepted		TRO
Piper ponganum Trel.	Accepted		TRO
Piper pontis Trel.	Accepted		TRO
Piper popayanense C. DC.	Accepted		TRO
Piper poporense Trel. & Yunck.	Accepted		TRO
Piper populifolium (Kunth) Kunth ex C. DC.	Accepted		TRO
Piper porphyrophyllum N.E.Br.	Unresolved		WCSP (in review)
Piper portachueloense Trel. & Yunck.	Synonym		WCSP (in review)
Piper portalense Trel.	Synonym		TRO
Piper portobellense C. DC.	Synonym		TRO
Piper portulacaefolium Roem. & Schult.	Synonym		TRO
Piper portulacoides Lam.	Synonym		TRO
Piper porveniricola Trel.	Accepted		TRO
Piper poscitum Trel. & Yunck.	Accepted		TRO
Piper positum Trel.	Accepted		TRO
Piper postelsianum Maxim.	Synonym		TRO
Piper posusanum Trel.	Accepted		TRO
Piper potamogetonifolium Opiz	Unresolved		WCSP (in review)
Piper potamophilum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper pothifolium Kunth	Synonym		TRO
Piper pothifolium (Kunth) Kunth ex C. DC.	Accepted		TRO
Piper pothiforme Wall. ex C.DC.	Unresolved		WCSP (in review)
Piper pothoides Wall.	Unresolved		WCSP (in review)
Piper pothomorphe (Miq.) C. DC.	Accepted		TRO
Piper pothophyllum Trel.	Accepted		TRO
Piper poueri A.H. Gentry	Unresolved		TRO
Piper praeacutilimbum C.DC.	Unresolved		WCSP (in review)
Piper praeclarum Trel.	Synonym		TRO
Piper praecox C.DC.	Unresolved		WCSP (in review)
Piper praegnans Rich. ex C.DC.	Unresolved		WCSP (in review)
Piper praemollitum Trel.	Synonym		TRO
Piper praemorsum Rottb. ex Vahl	Synonym		TRO
Piper praesagium Trel. & Yunck.	Unresolved		WCSP (in review)
Piper praeterlatum Trel.	Synonym		TRO
Piper premnospicum Tebbs	Unresolved		WCSP (in review)
Piper preslii C. DC.	Synonym		TRO
Piper presliiaingii C. DC.	Unresolved		TRO
Piper prianamense C.DC.	Unresolved		WCSP (in review)
Piper prietoi Yunck.	Accepted		TRO
Piper prismaticum C. DC.	Synonym		TRO
Piper prismaticum var. magnifolium (C. DC.) Trel.	Unresolved		TRO
Piper prismaticum var. tilaranum Trel.	Synonym		TRO
Piper prismaticum var. villosulum Trel.	Synonym		TRO
Piper procerifolium C.DC.	Unresolved		WCSP (in review)
Piper procerum Trel.	Accepted		TRO
Piper prodigum Trel.	Synonym		TRO
Piper productispicum Yunck.	Synonym		TRO
Piper propinquum C.DC.	Unresolved		WCSP (in review)
Piper propinquum var. brevistylum Trel.	Synonym		TRO
Piper propinquum var. grande Trel.	Synonym		TRO
Piper propinquum var. propinquum	Synonym		TRO
Piper protracticuspidatum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper protractispicum C.DC.	Unresolved		WCSP (in review)
Piper protractum C.DC.	Unresolved		WCSP (in review)
Piper pruinosum Kunth	Synonym		WCSP (in review)
Piper prunifolium J.Jacq.	Accepted		WCSP (in review)
Piper prunifolium subsp. artanthe Steyerm.	Synonym		TRO
Piper prunifolium var. carboneranum (Yunck.) Steyerm.	Accepted		WCSP (in review)
Piper prunifolium var. prunifolium	Accepted		TRO
Piper prunifolium var. tachiranum (Yunck.) Steyerm.	Synonym		WCSP (in review)
Piper pseudamboinense C.DC.	Unresolved		WCSP (in review)
Piper pseudo-aduncum C. DC.	Synonym		TRO
Piper pseudo-viridicaule Trel.	Synonym		TRO
Piper pseudo-viridicaule var. nievicitanum Trel.	Synonym		TRO
Piper pseudoacreanum Steyerm.	Accepted		WCSP (in review)
Piper pseudoaequale Steyerm.	Accepted		WCSP (in review)
Piper pseudoalbuginiferum Trel.	Synonym		TRO
Piper pseudoamalago C.DC.	Unresolved		WCSP (in review)
Piper pseudoarboreum Yunck.	Accepted		TRO
Piper pseudoarmatum Yunck.	Synonym		TRO
Piper pseudoasperifolium C. DC.	Accepted		TRO
Piper pseudobarbatum C. DC.	Accepted		TRO
Piper pseudoblattarum C.DC.	Unresolved		WCSP (in review)
Piper pseudobredemeyeri Steyerm.	Accepted		WCSP (in review)
Piper pseudocallosum Trel.	Accepted		TRO
Piper pseudocativalense Trel.	Accepted		TRO
Piper pseudochavica C.DC.	Unresolved		WCSP (in review)
Piper pseudochurumayu (Kunth) Poepp. ex Steud.	Synonym		WCSP (in review)
Piper pseudochurumayu (Kunth) C. DC.	Synonym		TRO
Piper pseudochurumayu var. membranaceum C.DC.	Synonym		WCSP (in review)
Piper pseudoconfusum C.DC.	Unresolved		WCSP (in review)
Piper pseudocurvatum Trel.	Synonym		TRO
Piper pseudodilatatum C. DC.	Synonym		TRO
Piper pseudodivulgatum Steyerm.	Accepted		WCSP (in review)
Piper pseudoeucalyptifolium Trel. & Yunck.	Accepted		WCSP (in review)
Piper pseudofimbriulatum Trel.	Synonym		TRO
Piper pseudoflexuosum Trel.	Accepted		TRO
Piper pseudofuligineum C. DC.	Synonym		TRO
Piper pseudogaragaranum Trel.	Accepted		TRO
Piper pseudoglabrescens Trel. & Yunck.	Accepted		WCSP (in review)
Piper pseudoglabrifolium Trel.	Synonym		TRO
Piper pseudogrande Yunck.	Unresolved		WCSP (in review)
Piper pseudohastularum Steyerm.	Accepted		WCSP (in review)
Piper pseudohastulatum Steyerm.	Unresolved		WCSP (in review)
Piper pseudojalapense McKown	Unresolved		WCSP (in review)
Piper pseudolanceifolium Trel.	Synonym		TRO
Piper pseudolanceolatum C. DC.	Synonym		TRO
Piper pseudolindenii C. DC.	Accepted		TRO
Piper pseudolindenii var. magnifolium C. DC.	Synonym		TRO
Piper pseudomarginatum C. DC.	Synonym		TRO
Piper pseudomatico Trel.	Accepted		TRO
Piper pseudomollicomum C. DC.	Accepted		TRO
Piper pseudomollicomum var. pseudomollicomum	Accepted		TRO
Piper pseudomunchanum Trel.	Accepted		TRO
Piper pseudonifrum C. DC.	Unresolved		TRO
Piper pseudonigrum Velay. & Amalraj	Unresolved		WCSP (in review)
Piper pseudonigrum C.DC.	Unresolved		WCSP (in review)
Piper pseudonobile C. DC.	Synonym		TRO
Piper pseudooblongum McKown	Unresolved		WCSP (in review)
Piper pseudoperuvianum C. DC.	Accepted		TRO
Piper pseudopopayanense Trel. & Yunck.	Unresolved		WCSP (in review)
Piper pseudopothifolium C. DC.	Synonym		TRO
Piper pseudopropinquum C. DC.	Synonym		TRO
Piper pseudopsis C. DC.	Synonym		TRO
Piper pseudorubeba Korth. ex Miq.	Unresolved		WCSP (in review)
Piper pseudosylvaticum C.DC.	Unresolved		WCSP (in review)
Piper pseudottonia E.F.Guim. & Ichaso	Unresolved		WCSP (in review)
Piper pseudovariabile Trel.	Synonym		TRO
Piper pseudovariabile var. collium Trel.	Synonym		TRO
Piper pseudovariabile var. pachypus Trel.	Synonym		TRO
Piper pseudovelutinum C. DC.	Synonym		TRO
Piper pseudovelutinum var. flavescens C. DC.	Synonym		TRO
Piper pseudovulgatum Steyerm.	Unresolved		WCSP (in review)
Piper psilocarpum C. DC.	Synonym		TRO
Piper psilocladum C. DC.	Synonym		TRO
Piper psilophyllum C. DC.	Accepted		TRO
Piper psilophyllum var. lanceifolium Yunck.	Synonym		TRO
Piper psilorhachis C. DC.	Accepted		TRO
Piper psilostachyum Kunth	Accepted		TRO
Piper psittacorum Endl.	Synonym		TRO
Piper pterocladum C. DC.	Accepted		TRO
Piper pteropoda (Moric.) C. DC.	Accepted		TRO
Piper pteropodon C.DC.	Unresolved		WCSP (in review)
Piper pubarulipes C.DC.	Unresolved		WCSP (in review)
Piper pubens Trel.	Synonym		TRO
Piper puberulescens Trel.	Accepted		TRO
Piper puberulibaccum C.DC.	Unresolved		WCSP (in review)
Piper puberulibracteum C. DC.	Synonym		TRO
Piper puberuliciliatum Yunck.	Accepted		TRO
Piper puberulidrupum Yunck.	Unresolved		WCSP (in review)
Piper puberulilimbum C. DC.	Accepted		TRO
Piper puberulinerve C. DC.	Accepted		TRO
Piper puberulinodum C.DC.	Unresolved		WCSP (in review)
Piper puberulirameum C.DC.	Unresolved		WCSP (in review)
Piper puberulispicum C.DC.	Unresolved		WCSP (in review)
Piper puberulum (Benth.) Maxim.	Synonym		TRO
Piper puberulum var. glabrum (C. DC.) A.C. Sm.	Unresolved		TRO
Piper pubescens Vahl	Unresolved		WCSP (in review)
Piper pubescens Haw.	Unresolved		WCSP (in review)
Piper pubescens Sol. ex C.DC.	Unresolved		WCSP (in review)
Piper pubescens Pers.	Unresolved		WCSP (in review)
Piper pubibaccum C. DC.	Accepted		TRO
Piper pubicatulum C. DC.	Accepted		TRO
Piper pubinerve C. DC.	Synonym		TRO
Piper pubinervulum C. DC.	Accepted		TRO
Piper pubiovarium Yunck.	Unresolved		WCSP (in review)
Piper pubipedunculum C.DC.	Unresolved		WCSP (in review)
Piper pubipes C.DC.	Unresolved		WCSP (in review)
Piper pubipetiolum C.DC.	Unresolved		WCSP (in review)
Piper pubirhache C.DC.	Unresolved		WCSP (in review)
Piper pubistipulum C. DC.	Accepted		TRO
Piper pubistipulum var. eustylosum Trel.	Synonym		TRO
Piper pubisubmarginalum Yunck.	Unresolved		WCSP (in review)
Piper pubisubmarginatum Yunck.	Unresolved		WCSP (in review)
Piper pubivaginatum Steyerm.	Accepted		WCSP (in review)
Piper puente-altoanum Trel.	Synonym		TRO
Piper pulchellum Aiton	Unresolved		WCSP (in review)
Piper pulchrum C.DC.	Unresolved		WCSP (in review)
Piper pulchrum var. copeyanum C. DC.	Synonym		TRO
Piper pulchrum var. costaricense C. DC.	Synonym		TRO
Piper pulicare D.Dietr.	Unresolved		WCSP (in review)
Piper pulleanum Yunck.	Unresolved		WCSP (in review)
Piper pullibaccum Trel.	Unresolved		WCSP (in review)
Piper pullibracteatum Trel.	Synonym		TRO
Piper pullispicum Trel.	Accepted		TRO
Piper pulogense C.DC.	Unresolved		WCSP (in review)
Piper pumilum D.Dietr.	Unresolved		WCSP (in review)
Piper punctatissimum C.DC.	Unresolved		WCSP (in review)
Piper punctatum Ruiz & Pav.	Synonym		TRO
Piper puncticulatum Ridl.	Unresolved		WCSP (in review)
Piper punctiunculatum Trel.	Synonym		TRO
Piper punctulantherum C.DC.	Unresolved		WCSP (in review)
Piper punctulatifolium Trel.	Synonym		TRO
Piper punctulivenum C. DC.	Synonym		TRO
Piper punctulivenum var. parvifolium C. DC.	Synonym		TRO
Piper puniceum Trel.	Accepted		TRO
Piper puraceanum Trel. & Yunck.	Accepted		TRO
Piper purdiei C.DC.	Unresolved		WCSP (in review)
Piper purpurascens D. Dietr.	Synonym		TRO
Piper purpureum (Ruiz & Pav.) Vahl	Synonym		TRO
Piper purpusianum Trel.	Unresolved		WCSP (in review)
Piper purulentum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper purulhanum C. DC.	Synonym		TRO
Piper purusanum Yunck.	Unresolved		WCSP (in review)
Piper pusillum Blume	Synonym		TRO
Piper pustulatum Yunck.	Unresolved		WCSP (in review)
Piper pustulicaule Trel.	Synonym		TRO
Piper putumayoense Trel. & Yunck.	Unresolved		WCSP (in review)
Piper puyoense Yunck.	Accepted		TRO
Piper pygmaeum Yunck.	Accepted		TRO
Piper pykarahense C.DC.	Unresolved		WCSP (in review)
Piper pyrifolium D. Dietr.	Synonym		TRO
Piper pyrifolium Vahl	Accepted		TRO
Piper quadrangulare J.V.Thomps.	Synonym		WCSP (in review)
Piper quadrangulum Willd. ex Miq.	Synonym		TRO
Piper quadratilimbum Trel.	Synonym		TRO
Piper quadratiovarium Yunck.	Unresolved		WCSP (in review)
Piper quadrifolium L.	Synonym		WCSP (in review)
Piper quebradense Trel.	Synonym		TRO
Piper quentinii Trel.	Unresolved		WCSP (in review)
Piper quillandanum Trel. & Ekman	Unresolved		WCSP (in review)
Piper quimirianum Trel.	Accepted		TRO
Piper quinqueangulatum Miq.	Unresolved		WCSP (in review)
Piper quinquenervium Warb.	Unresolved		WCSP (in review)
Piper quintuplinervium C.DC.	Unresolved		WCSP (in review)
Piper quiriguanum Trel.	Synonym		TRO
Piper quitense C. DC.	Accepted		TRO
Piper raapii C.DC.	Unresolved		WCSP (in review)
Piper racemosum Vahl	Synonym		TRO
Piper radicans Vahl	Unresolved		WCSP (in review)
Piper radula Kunth	Synonym		TRO
Piper rafaeli Trel.	Synonym		TRO
Piper rafflesii (Miq.) C. DC.	Accepted		TRO
Piper raizudoanum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper ramipilum C.DC.	Unresolved		WCSP (in review)
Piper ramosense Yunck.	Unresolved		WCSP (in review)
Piper ramosii C.DC.	Unresolved		WCSP (in review)
Piper rarispicum C.DC.	Unresolved		WCSP (in review)
Piper rarum C.DC.	Accepted		WCSP (in review)
Piper rasile Trel.	Accepted		TRO
Piper ratisportanum Trel.	Synonym		TRO
Piper readii C.DC.	Unresolved		WCSP (in review)
Piper realejoanum Hemsl.	Unresolved		TRO
Piper realgoanum C. DC.	Synonym		TRO
Piper recensitum Trel.	Accepted		TRO
Piper recessum R.O.Gardner	Unresolved		WCSP (in review)
Piper rechingeri C.DC.	Unresolved		WCSP (in review)
Piper reciprocum Trel.	Synonym		TRO
Piper recreoense Trel.	Accepted		TRO
Piper rectamentum Trel.	Synonym		TRO
Piper rectispicum Trel.	Synonym		TRO
Piper recuperatum Trel.	Synonym		TRO
Piper recurvatum Blume	Unresolved		WCSP (in review)
Piper recurvum Blume	Unresolved		WCSP (in review)
Piper recurvum Rich. ex C.DC.	Unresolved		WCSP (in review)
Piper redactum Trel.	Accepted		TRO
Piper reductipes Trel.	Accepted		TRO
Piper reflexum L.f.	Synonym		WCSP (in review)
Piper regale C. DC.	Accepted		TRO
Piper regelii C.DC.	Unresolved		WCSP (in review)
Piper regnellii (Miq.) C.DC.	Accepted		WCSP (in review)
Piper regnellii var. glabrius C. DC.	Synonym		TRO
Piper regnellii var. pallescens (C.DC.) Yunck.	Synonym		WCSP (in review)
Piper regnellii var. parvifolium C. DC.	Synonym		TRO
Piper regresivanum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper regressum Anders. in Miq.	Synonym		TRO
Piper reinwardtianum (Miq.) C. DC.	Accepted		TRO
Piper reitzii Yunck.	Accepted		TRO
Piper relaxatum Trel.	Accepted		TRO
Piper rematense Trel.	Synonym		TRO
Piper remotinervium Görts	Unresolved		WCSP (in review)
Piper reniforme Willd. ex Link	Unresolved		WCSP (in review)
Piper reniforme Poir.	Unresolved		WCSP (in review)
Piper renitens (Miq.) Yunck.	Accepted		TRO
Piper reptabundum C. DC.	Accepted		TRO
Piper resalutatum Trel.	Accepted		TRO
Piper resatum Trel.	Synonym		TRO
Piper restio Trel.	Accepted		TRO
Piper restis Trel.	Unresolved		TRO
Piper restrictum Trel.	Accepted		TRO
Piper retalhuleuense Trel. & Standl.	Unresolved		WCSP (in review)
Piper reticulatum L.	Accepted		WCSP (in review)
Piper reticulatum Vell.	Misapplied		WCSP (in review)
Piper reticulatum var. reticulatum	Accepted		TRO
Piper reticulosum Opiz	Synonym		TRO
Piper retinervulum C.DC.	Unresolved		WCSP (in review)
Piper retrofractum Vahl	Accepted		TRO
Piper retropilosum C.DC.	Unresolved		WCSP (in review)
Piper retropuberulum Yunck.	Synonym		TRO
Piper retusum L. f.	Synonym		TRO
Piper reventazonis Trel.	Synonym		TRO
Piper revi-vetusti Trel.	Synonym		TRO
Piper revolutum Rich. ex Kunth	Unresolved		WCSP (in review)
Piper rhinostachyum Trel.	Accepted		TRO
Piper rhizocaule Trel.	Unresolved		WCSP (in review)
Piper rhodocarpum Trel.	Unresolved		WCSP (in review)
Piper rhododendrifolium Kunth	Accepted		WCSP (in review)
Piper rhodostachyum Trel.	Synonym		TRO
Piper rhombeum (Ruiz & Pav.) Vahl	Synonym		WCSP (in review)
Piper rhomboidale Dum.Cours.	Unresolved		WCSP (in review)
Piper rhombophyllum C.DC.	Unresolved		WCSP (in review)
Piper rhyncholepsis C.DC.	Unresolved		WCSP (in review)
Piper rhynchostachyum (Miq.) C. DC.	Synonym		TRO
Piper rhytidocarpum Hook. f.	Accepted		TRO
Piper ribesioides Wall.	Unresolved		WCSP (in review)
Piper richardianum C.DC.	Unresolved		WCSP (in review)
Piper richardiifolium Kunth	Synonym		TRO
Piper richardiifolium (Kunth) Kunth ex C. DC.	Accepted		TRO
Piper ridleyi C.DC.	Unresolved		WCSP (in review)
Piper riedelii C.DC.	Unresolved		WCSP (in review)
Piper rigidum C.DC.	Unresolved		WCSP (in review)
Piper riitosense Trel. & Yunck.	Accepted		WCSP (in review)
Piper rinconense Trel.	Unresolved		WCSP (in review)
Piper rindjanense C.DC.	Unresolved		WCSP (in review)
Piper rindu C.DC.	Unresolved		WCSP (in review)
Piper rio-cajambrense Trel. & Yunck.	Unresolved		WCSP (in review)
Piper rio-cauchosanum Yunck.	Unresolved		WCSP (in review)
Piper rio-chiadoense Trel. & Yunck.	Unresolved		WCSP (in review)
Piper rio-marguanum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper rio-nechianum Yunck.	Unresolved		WCSP (in review)
Piper rio-paraguanum Trel. ex V.M. Badillo	Synonym		TRO
Piper rio-zulianum Trel. & Yunck.	Accepted		WCSP (in review)
Piper rioense Yunck.	Accepted		WCSP (in review)
Piper riojanum Trel.	Accepted		TRO
Piper riotintasense Yunck.	Synonym		TRO
Piper ripagaudens Yunck.	Unresolved		WCSP (in review)
Piper riparense C. DC.	Synonym		TRO
Piper riparium Kunth	Synonym		TRO
Piper ripense C. DC.	Synonym		TRO
Piper ripicola C. DC.	Synonym		TRO
Piper rivialbi Trel. & Yunck.	Synonym		TRO
Piper rivinoides (Kunth) C. DC.	Accepted		TRO
Piper rivinoides f. magnifolium Yunck.	Accepted		TRO
Piper rivulare C.DC.	Unresolved		WCSP (in review)
Piper robinsonii C.DC.	Unresolved		WCSP (in review)
Piper roblalense Yunck.	Unresolved		WCSP (in review)
Piper robleanum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper roborense Trel.	Unresolved		TRO
Piper robustipedunculum Yunck.	Accepted		WCSP (in review)
Piper rodatzii K.Schum. & Lauterb.	Unresolved		WCSP (in review)
Piper roemeri C.DC.	Unresolved		WCSP (in review)
Piper rogaguanum Trel.	Unresolved		WCSP (in review)
Piper rohrii C.DC.	Unresolved		WCSP (in review)
Piper rojasii C.DC.	Unresolved		WCSP (in review)
Piper rollingo Schult.	Unresolved		WCSP (in review)
Piper romboutsii Yunck.	Synonym		TRO
Piper ronaldii Steyerm.	Accepted		WCSP (in review)
Piper roqueanum Trel.	Accepted		TRO
Piper rosei C. DC.	Accepted		TRO
Piper rosei C. DC. ex Trel.	Synonym		TRO
Piper roseovenulosum Trel.	Synonym		TRO
Piper rostratum Roxb.	Unresolved		WCSP (in review)
Piper rothianum F.M.Bailey	Unresolved		WCSP (in review)
Piper rothschuhii C. DC.	Synonym		TRO
Piper rotundatum (Kunth) Poir.	Synonym		WCSP (in review)
Piper rotundibaccum Trel.	Synonym		TRO
Piper rotundibaccum var. fraijanesanum Trel.	Synonym		TRO
Piper rotundifolium L.	Synonym		WCSP (in review)
Piper rotundistigmum C.DC.	Unresolved		WCSP (in review)
Piper rotundistipulum Trel. & Yunck.	Synonym		TRO
Piper rotundum Noronha	Unresolved		WCSP (in review)
Piper rovirosae C.DC.	Unresolved		WCSP (in review)
Piper roxburghianum Schult.	Unresolved		WCSP (in review)
Piper roxburghii (Miq.) J.Presl	Unresolved		WCSP (in review)
Piper rubellum Haw. ex Spreng.	Unresolved		WCSP (in review)
Piper rubescens C.DC.	Synonym		WCSP (in review)
Piper rubiginosum Trel.	Accepted		TRO
Piper rubioides (Kunth) Poir.	Synonym		WCSP (in review)
Piper rubramentum C.DC.	Unresolved		WCSP (in review)
Piper rubribaccum Trel.	Accepted		TRO
Piper rubricaule Nees	Synonym		WCSP (in review)
Piper rubripes Trel.	Synonym		TRO
Piper rubripunctulatum C.DC.	Unresolved		WCSP (in review)
Piper rubroglandulosum Chaveer. & Mokkamul	Unresolved		WCSP (in review)
Piper rubronodosum G.Nicholson	Unresolved		WCSP (in review)
Piper rubrospadix Trel.	Synonym		TRO
Piper rubrovenosum Rodigas	Unresolved		WCSP (in review)
Piper rubrum C. DC.	Accepted		TRO
Piper rude Kunth	Accepted		TRO
Piper rudgeanum (Miq.) C. DC.	Accepted		TRO
Piper rueckeri K.Schum.	Unresolved		WCSP (in review)
Piper rufescens C. DC.	Synonym		TRO
Piper rufescentibaccum C.DC.	Unresolved		WCSP (in review)
Piper rufibracteum C.DC.	Unresolved		WCSP (in review)
Piper ruficaule D.Parodi	Unresolved		WCSP (in review)
Piper rufinerbe Opiz	Unresolved		TRO
Piper rufinerve Opiz	Unresolved		WCSP (in review)
Piper rufipilum Yunck.	Accepted		WCSP (in review)
Piper rufispicum C.DC.	Unresolved		WCSP (in review)
Piper rufum C.DC.	Unresolved		WCSP (in review)
Piper rugosibaccum Trel.	Accepted		TRO
Piper rugosifolium Trel.	Synonym		TRO
Piper rugosilimbum Trel.	Accepted		TRO
Piper rugosum Opiz	Synonym		TRO
Piper rugosum Vahl	Synonym		TRO
Piper rugulosum C. DC.	Synonym		TRO
Piper ruizianum D.Dietr.	Synonym		WCSP (in review)
Piper rumicifolium (Miq.) C. DC.	Accepted		TRO
Piper rumphii (Miq.) C. DC.	Accepted		TRO
Piper rupestre (Kunth) Poir.	Synonym		WCSP (in review)
Piper rupigaudens C.DC.	Unresolved		WCSP (in review)
Piper rupununianum Trel. & Yunck.	Accepted		WCSP (in review)
Piper rurrenbaqueanum Trel.	Synonym		TRO
Piper rusbyi C. DC.	Accepted		TRO
Piper ruscifolium (Kunth) Poir.	Synonym		TRO
Piper rusticum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper sabaletasanum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper sabanaense Yunck.	Accepted		WCSP (in review)
Piper sabanillanum Trel.	Synonym		TRO
Piper sablanum Quisumb.	Unresolved		WCSP (in review)
Piper sabogense Trel.	Unresolved		TRO
Piper sacchamatesense Yunck.	Unresolved		WCSP (in review)
Piper sacleuxii C.DC.	Unresolved		WCSP (in review)
Piper sagax Trel.	Synonym		TRO
Piper sagittifer Trel.	Accepted		TRO
Piper sagittifolium C.DC.	Unresolved		WCSP (in review)
Piper sagotii C. DC.	Synonym		TRO
Piper sagranum C.DC.	Unresolved		WCSP (in review)
Piper saigonense C. DC.	Synonym		TRO
Piper salamancanum Trel.	Synonym		TRO
Piper saldanhae Yunck.	Accepted		WCSP (in review)
Piper salgaranum Trel. & Yunck.	Accepted		TRO
Piper salgarianum Trel.	Synonym		TRO
Piper salicariaefolium (Miq.) Kunth ex C. DC.	Accepted		TRO
Piper salicariaefolium var. lehmannianum (Miq.) C. DC.	Synonym		TRO
Piper salicifolium Vahl	Accepted		TRO
Piper salicinum Opiz	Unresolved		WCSP (in review)
Piper salicioides Yunck.	Unresolved		WCSP (in review)
Piper salignum (Kunth) Poir.	Synonym		WCSP (in review)
Piper salinasanum C. DC.	Synonym		TRO
Piper salinasanum var. parvifolium C. DC.	Synonym		TRO
Piper salinasanum var. subscabrifolium C. DC.	Synonym		TRO
Piper saloyanum Trel. & Yunck.	Accepted		TRO
Piper salticola Ridl.	Unresolved		WCSP (in review)
Piper saltuum C.DC.	Synonym		WCSP (in review)
Piper salutatrix Trel.	Synonym		TRO
Piper salviifolium (Miq.) C. DC.	Synonym		TRO
Piper salzmannii C.DC.	Unresolved		WCSP (in review)
Piper samanense Urb.	Unresolved		WCSP (in review)
Piper sambuanum C. DC.	Accepted		TRO
Piper sampaioi Yunck.	Unresolved		WCSP (in review)
Piper san-andresense Trel. & Yunck.	Unresolved		WCSP (in review)
Piper san-joseanum C. DC.	Synonym		TRO
Piper san-juananum Trel.	Unresolved		WCSP (in review)
Piper san-luisense Trel.	Accepted		WCSP (in review)
Piper san-marcosanum C.DC.	Unresolved		WCSP (in review)
Piper san-martinense Trel. & Yunck.	Unresolved		WCSP (in review)
Piper san-vicentense Trel. & Yunck.	Accepted		WCSP (in review)
Piper sancarlosianum C.DC.	Synonym		WCSP (in review)
Piper sancristobalanum Trel.	Synonym		TRO
Piper sanctae-crucis C. DC.	Synonym		TRO
Piper sancti-felicis Trel.	Accepted		TRO
Piper sanctii-felsis Trel.	Unresolved		TRO
Piper sanctum Miq.	Accepted		TRO
Piper sanctum (Miq.) Schltdl. ex C. DC.	Unresolved		TRO
Piper sandaloense Trel.	Synonym		TRO
Piper sandemanii Yunck.	Synonym		TRO
Piper sandianum C. DC.	Accepted		TRO
Piper sangabrielanum Trel.	Unresolved		WCSP (in review)
Piper sangorianum C. DC.	Accepted		TRO
Piper sanguineispicum Trel.	Synonym		TRO
Piper sanjoseanum var. aristolochiaefolium Trel.	Synonym		TRO
Piper sanjoseanum var. chiriquinum Trel.	Synonym		TRO
Piper sanjoseanum var. kobense Trel.	Synonym		TRO
Piper sanjoseanum var. minor Trel.	Synonym		TRO
Piper sanjoseanum var. panamanum Trel.	Synonym		TRO
Piper sanjoseanum var. remediosense Trel.	Synonym		TRO
Piper sanjoseanum var. tabogense Trel.	Synonym		TRO
Piper sanlorenzanum Trel.	Synonym		TRO
Piper sanmiguelense Trel. & Yunck.	Accepted		TRO
Piper sannicolasense Trel.	Accepted		TRO
Piper sanrafaelense Trel.	Synonym		TRO
Piper sanramonense Trel.	Accepted		TRO
Piper sanroqueanum Trel.	Accepted		TRO
Piper santa-barbaranum Trel.	Unresolved		WCSP (in review)
Piper santa-martanum C.DC.	Synonym		WCSP (in review)
Piper santae-clarae Standl. & Steyerm.	Unresolved		WCSP (in review)
Piper santaremense C.DC.	Unresolved		WCSP (in review)
Piper santaritanum Trel.	Accepted		TRO
Piper santarosanum C. DC.	Synonym		TRO
Piper santiaganum Trel.	Synonym		TRO
Piper santo-domingense Trel.	Unresolved		WCSP (in review)
Piper santosanum C.DC.	Unresolved		WCSP (in review)
Piper sapotoanum Trel.	Accepted		TRO
Piper sapotoyacuense Trel.	Accepted		TRO
Piper saramaccanum Yunck.	Synonym		TRO
Piper sarapiquinum C. DC.	Synonym		TRO
Piper sararense Trel. & Yunck.	Unresolved		WCSP (in review)
Piper sarasinorum C.DC.	Unresolved		WCSP (in review)
Piper sarawakanum C.DC.	Unresolved		WCSP (in review)
Piper sarcostylum C.DC.	Unresolved		WCSP (in review)
Piper sarmentosum Roxb.	Accepted		TRO
Piper sasaimanum Yunck.	Synonym		TRO
Piper satisfactum Trel.	Accepted		TRO
Piper saururoides Desv. ex Ham.	Synonym		WCSP (in review)
Piper saururus Burm.	Unresolved		WCSP (in review)
Piper savagii C. DC.	Synonym		TRO
Piper savanense C.DC.	Unresolved		WCSP (in review)
Piper saxatilis Wall.	Unresolved		WCSP (in review)
Piper saxicola C.DC.	Unresolved		WCSP (in review)
Piper saxicolum Vahl	Unresolved		WCSP (in review)
Piper scabiosifolium Trel.	Accepted		TRO
Piper scabrellum Yunck.	Accepted		WCSP (in review)
Piper scabricaule Trel.	Synonym		TRO
Piper scabridulicaule Trel.	Accepted		TRO
Piper scabridulilimbum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper scabridum Haenke	Unresolved		WCSP (in review)
Piper scabrifolium Hook. & Arn.	Unresolved		WCSP (in review)
Piper scabrilimbum C. DC.	Synonym		TRO
Piper scabriseptum Trel.	Synonym		TRO
Piper scabriseptum var. reductum Trel.	Synonym		TRO
Piper scabriusculum A.Dietr.	Unresolved		WCSP (in review)
Piper scabrum Ruiz & Pav.	Synonym		TRO
Piper scabrum Sw.	Synonym		TRO
Piper scabrum Willd. ex Kunth	Synonym		TRO
Piper scabrum Lam.	Synonym		TRO
Piper scalariforme Trel.	Accepted		TRO
Piper scalarispicum Trel.	Accepted		TRO
Piper scalpens Trel.	Synonym		TRO
Piper scandens (Ruiz & Pav.) Vahl	Synonym		TRO
Piper scandens Sw.	Synonym		TRO
Piper scandenticaule Yunck.	Unresolved		WCSP (in review)
Piper scansum Trel. & Yunck.	Accepted		TRO
Piper scapispicum Trel.	Synonym		TRO
Piper schachii (Miq.) C. DC.	Accepted		TRO
Piper schenckii C.DC.	Unresolved		WCSP (in review)
Piper schiedeanum Steud.	Accepted		TRO
Piper schippianum Trel. & Standl.	Unresolved		WCSP (in review)
Piper schippianum Trel.	Unresolved		WCSP (in review)
Piper schizonephos C.DC.	Unresolved		WCSP (in review)
Piper schlechtendahlianum (Miq.) C. DC.	Accepted		TRO
Piper schlechtendalii Steud.	Accepted		TRO
Piper schlechteri C.DC.	Unresolved		WCSP (in review)
Piper schlimii C.DC.	Accepted		WCSP (in review)
Piper schmidtii Hook.f.	Unresolved		WCSP (in review)
Piper schottii (Miq.) C. DC.	Accepted		TRO
Piper schultesii Yunck.	Synonym		TRO
Piper schumannii C.DC.	Unresolved		WCSP (in review)
Piper schunkeanum Trel.	Accepted		TRO
Piper schuppii A.H. Gentry	Accepted		TRO
Piper schwackei C.DC.	Unresolved		WCSP (in review)
Piper sciaphilum C. DC.	Accepted		TRO
Piper scintillans Trel.	Synonym		TRO
Piper sclerocladum C.DC.	Unresolved		WCSP (in review)
Piper scleromyelum C. DC.	Synonym		TRO
Piper sclerophloeum C.DC.	Accepted		WCSP (in review)
Piper sclerophloeum var. scandens C.DC	Synonym		WCSP (in review)
Piper scobinifolium Yunck.	Unresolved		WCSP (in review)
Piper scopulorum Kunth	Unresolved		WCSP (in review)
Piper scortechinii C.DC.	Unresolved		WCSP (in review)
Piper scutaespicum Trel.	Accepted		TRO
Piper scutatum Willd.	Synonym		TRO
Piper scutellaefolium (Ruiz & Pav.) Vahl	Synonym		TRO
Piper scutellatum (Ruiz & Pav.) Pers.	Synonym		TRO
Piper scutelliferum C.DC.	Unresolved		WCSP (in review)
Piper scutifolium Yunck.	Unresolved		WCSP (in review)
Piper scutilimbum C. DC.	Accepted		TRO
Piper scutiphyllum Ham.	Synonym		TRO
Piper sebastianopolitense C.DC.	Unresolved		WCSP (in review)
Piper sebastianum Yunck.	Unresolved		WCSP (in review)
Piper secundum Ruiz & Pav.	Accepted		TRO
Piper secundum Poepp. ex Kunth	Synonym		TRO
Piper seducentifolium Trel.	Synonym		TRO
Piper seductum Trel.	Synonym		TRO
Piper seemannianum C.DC.	Unresolved		WCSP (in review)
Piper segoviarum Standl. & L.O. Williams	Synonym		TRO
Piper seitzii C. DC.	Synonym		TRO
Piper selangorense C.DC.	Unresolved		WCSP (in review)
Piper sellertianum Trel.	Accepted		TRO
Piper selloi C.DC.	Unresolved		WCSP (in review)
Piper selloi var. latilimbum C.DC.	Unresolved		WCSP (in review)
Piper sellowianum (Kunth) Kunth ex C. DC.	Accepted		TRO
Piper semangkoanum C.DC.	Unresolved		WCSP (in review)
Piper semicordulatum Trel.	Accepted		TRO
Piper semicrudum Trel.	Accepted		TRO
Piper semiimmersum C. DC.	Accepted		TRO
Piper semimetrale C.DC.	Unresolved		WCSP (in review)
Piper seminervosum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper seminitidulum Trel.	Accepted		TRO
Piper semiplenum Trel.	Accepted		TRO
Piper semitarium Trel. & Yunck.	Unresolved		WCSP (in review)
Piper semivolubile C.DC.	Unresolved		WCSP (in review)
Piper semperflorens C. DC.	Accepted		TRO
Piper sempervirens (Trel.) Lundell	Synonym		TRO
Piper senporeiense Yamam.	Accepted		TRO
Piper sepicola C. DC.	Synonym		TRO
Piper sepium C. DC.	Synonym		TRO
Piper sepium var. guacimonum C. DC.	Synonym		TRO
Piper septemnerve (Ruiz & Pav.) Vahl	Synonym		TRO
Piper septuplinervium (Miq.) C. DC.	Accepted		TRO
Piper septuplinervium var. subpubinervium Yunck.	Synonym		TRO
Piper sericeonervosum Trel.	Accepted		TRO
Piper serotinum Trel.	Accepted		TRO
Piper serpavillanum Trel.	Accepted		TRO
Piper serpens Sw.	Synonym		WCSP (in review)
Piper serpentarioides Nees ex Miq.	Unresolved		WCSP (in review)
Piper serpyllifolium Vahl	Unresolved		WCSP (in review)
Piper serrulatum Yunck.	Accepted		TRO
Piper sesquimetrale Trel.	Synonym		TRO
Piper sessilifolium Willd. ex Schult.	Unresolved		WCSP (in review)
Piper setebarraense E.F.Guim. & L.H.P.Costa	Unresolved		WCSP (in review)
Piper setigerum Trel.	Accepted		TRO
Piper setosum Trel. & Yunck.	Accepted		TRO
Piper setulosum Trel.	Accepted		TRO
Piper siassiense C.DC.	Unresolved		WCSP (in review)
Piper sibunense Trel.	Synonym		TRO
Piper sidaefolium Link & Otto	Synonym		TRO
Piper sidipilum Trel.	Synonym		TRO
Piper sieberi (Miq.) C.DC.	Synonym		WCSP (in review)
Piper sierra-aroense Steyerm.	Accepted		WCSP (in review)
Piper sievekingii C. DC.	Synonym		TRO
Piper signatum Trel.	Synonym		TRO
Piper siguatepequense Trel.	Synonym		TRO
Piper siguatepequense var. subrhombifolium Trel. ex Yunck.	Synonym		TRO
Piper sikkimense C.DC.	Unresolved		WCSP (in review)
Piper silencioi Trel.	Synonym		TRO
Piper silentvalleyense Ravindran, M.K.Nair & Asokan Nair	Unresolved		WCSP (in review)
Piper silhouettanum J.Gerlach	Unresolved		WCSP (in review)
Piper silvaense Yunck.	Unresolved		WCSP (in review)
Piper silvanorum Trel.	Synonym		TRO
Piper silvarum C. DC.	Accepted		TRO
Piper silvicola C. DC.	Synonym		TRO
Piper silvigaudens Yunck.	Accepted		WCSP (in review)
Piper silvimontanum C.DC.	Unresolved		WCSP (in review)
Piper silvioberrans Trel.	Synonym		TRO
Piper silvivagum C. DC.	Accepted		TRO
Piper silvivagum var. peruvianum C. DC.	Synonym		TRO
Piper simile Quisumb.	Unresolved		WCSP (in review)
Piper simplex D.Dietr.	Unresolved		WCSP (in review)
Piper simplex Endl.	Unresolved		WCSP (in review)
Piper simulans Trel.	Synonym		TRO
Piper simulhabitans Trel.	Synonym		TRO
Piper sinense (Champ. ex Benth.) C. DC.	Synonym		TRO
Piper singkojan C.DC. ex Koord.	Unresolved		WCSP (in review)
Piper singulare C. DC.	Synonym		TRO
Piper sintenense Hatus.	Accepted		TRO
Piper sinuatifolium Trel.	Synonym		TRO
Piper sinuatispicum Trel.	Unresolved		WCSP (in review)
Piper sinuclausum Trel.	Accepted		TRO
Piper sinugaudens C. DC.	Accepted		TRO
Piper sinuosirameum Trel.	Synonym		TRO
Piper sipenanum Trel. & Yunck.	Synonym		TRO
Piper siquirresense Trel.	Synonym		TRO
Piper siriboa L.	Unresolved		WCSP (in review)
Piper siriboa G.Forst.	Unresolved		WCSP (in review)
Piper siriboa B.Heyne	Unresolved		WCSP (in review)
Piper sirium C.DC.	Unresolved		WCSP (in review)
Piper skutchii Trel. & Yunck.	Accepted		TRO
Piper smilacifolium Kunth	Synonym		WCSP (in review)
Piper sneidernii Yunck.	Unresolved		WCSP (in review)
Piper snethlagei Yunck.	Unresolved		WCSP (in review)
Piper sociorum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper sodiroi C. DC.	Accepted		TRO
Piper sodiroi var. fuscum Sodiro	Synonym		TRO
Piper sodiroi var. incanum Sodiro	Synonym		TRO
Piper sogerense S.Moore	Unresolved		WCSP (in review)
Piper sogerianum C.DC.	Unresolved		WCSP (in review)
Piper soledadense Trel.	Accepted		TRO
Piper solmsianum C.DC.	Unresolved		WCSP (in review)
Piper solmsianum var. hilarianum (Miq.) Yunck.	Unresolved		TRO
Piper solutidrupum Yunck.	Accepted		WCSP (in review)
Piper sonadense C.DC.	Unresolved		WCSP (in review)
Piper sonsonatense Standl. & S.Calderon	Unresolved		WCSP (in review)
Piper soricicaudatum Trel.	Synonym		TRO
Piper sororium (Miq.) C. DC.	Accepted		TRO
Piper sorsogonum C.DC.	Unresolved		WCSP (in review)
Piper sotae Yunck.	Unresolved		WCSP (in review)
Piper spathelliferum Quisumb.	Unresolved		WCSP (in review)
Piper spathulatum D.Dietr.	Unresolved		WCSP (in review)
Piper speciosum Kunth	Synonym		WCSP (in review)
Piper speculatoris Trel.	Unresolved		WCSP (in review)
Piper speratum Trel.	Synonym		TRO
Piper sperdinum C. DC.	Synonym		TRO
Piper sphaerocarpum (Griseb.) C.DC. ex C.Wright	Unresolved		WCSP (in review)
Piper sphaeroides C.DC.	Unresolved		WCSP (in review)
Piper sphaerostachyum C.DC.	Unresolved		WCSP (in review)
Piper spicilongum Trel.	Synonym		TRO
Piper spirei C. DC.	Synonym		TRO
Piper spirei var. pilosius C. DC.	Synonym		TRO
Piper spissinervium Trel.	Synonym		TRO
Piper spoliatum Trel. & Yunck.	Synonym		TRO
Piper sprengelianum C.DC.	Unresolved		WCSP (in review)
Piper spruceanum C. DC.	Accepted		TRO
Piper spurium Link	Synonym		TRO
Piper squalidum Trel.	Synonym		TRO
Piper squalipelliculum Trel.	Synonym		TRO
Piper squamuliferum C.DC.	Unresolved		WCSP (in review)
Piper squamulosum C. DC.	Accepted		TRO
Piper stamineum (Miq.) C. DC.	Synonym		TRO
Piper stamineum var. longifolium C. DC.	Synonym		TRO
Piper staminodiferum C.DC.	Unresolved		WCSP (in review)
Piper standleyi Trel.	Unresolved		WCSP (in review)
Piper staphyle Roem. & Schult.	Unresolved		WCSP (in review)
Piper statarium Trel. & Yunck.	Synonym		WCSP (in review)
Piper statum Trel. & Yunck.	Synonym		TRO
Piper stehleorum Trel. ex Stehlé	Unresolved		WCSP (in review)
Piper steinbachii Yunck.	Unresolved		WCSP (in review)
Piper stellatum Vell.	Unresolved		WCSP (in review)
Piper stellatum Sw.	Unresolved		WCSP (in review)
Piper stellipilum (Miq.) C. DC.	Accepted		TRO
Piper stenocarpum C.DC.	Unresolved		WCSP (in review)
Piper stenocladophorum Trel.	Synonym		TRO
Piper stenocladum C. DC.	Synonym		TRO
Piper stenophyllum C.DC.	Unresolved		WCSP (in review)
Piper stenophyllum Voigt	Unresolved		WCSP (in review)
Piper stenopodum C.DC.	Unresolved		WCSP (in review)
Piper stenostachys C. DC.	Accepted		TRO
Piper sternii Yunck.	Synonym		TRO
Piper stevensii Trel.	Accepted		TRO
Piper stevensonii Trel. & Standl.	Synonym		TRO
Piper steyermarkii Yunck.	Accepted		WCSP (in review)
Piper stiliferum Yunck.	Accepted		TRO
Piper stillans Trel. & Standl.	Synonym		TRO
Piper stipitiforme C.C. Chang ex Y.Q. Tseng	Accepted		TRO
Piper stipulaceum Opiz	Accepted		TRO
Piper stipulare A.C.Sm.	Unresolved		WCSP (in review)
Piper stipulosum Sodiro	Accepted		TRO
Piper stoloniferum Poir.	Unresolved		WCSP (in review)
Piper stomachicum C. DC.	Accepted		TRO
Piper storkii Trel.	Accepted		TRO
Piper striaticaule Yunck.	Unresolved		WCSP (in review)
Piper striatifolium Yunck.	Unresolved		WCSP (in review)
Piper striatinervosum Trel.	Synonym		TRO
Piper striatipetiolum Yunck.	Unresolved		WCSP (in review)
Piper striatum (Ruiz & Pav.) Vahl	Synonym		WCSP (in review)
Piper strigillosicaule Trel.	Accepted		TRO
Piper strigillosum Trel.	Accepted		TRO
Piper strigosum Trel.	Accepted		TRO
Piper stuebelii Trel.	Accepted		TRO
Piper stupposum A. Dietr.	Accepted		TRO
Piper stylosum Miq.	Unresolved		WCSP (in review)
Piper suaveolens (Ham.) Desf.	Unresolved		WCSP (in review)
Piper suaveolens C.DC.	Unresolved		WCSP (in review)
Piper subaduncum Yunck.	Accepted		TRO
Piper subaequale (C. Presl) C. DC.	Synonym		TRO
Piper subaequilaterum Trel.	Synonym		TRO
Piper subaerophilum C.DC.	Unresolved		WCSP (in review)
Piper subalbicans C.DC.	Unresolved		WCSP (in review)
Piper subalpinum Yunck.	Accepted		WCSP (in review)
Piper subandina Trel.	Accepted		TRO
Piper subandinum C. DC.	Accepted		TRO
Piper subarborescens C. DC.	Synonym		TRO
Piper subasperatum Trel.	Synonym		TRO
Piper subaspericaule C. DC.	Synonym		TRO
Piper subasperifolium Yunck.	Unresolved		WCSP (in review)
Piper subauriculatum (Miq.) C. DC.	Synonym		TRO
Piper subbrunneispicum Yunck.	Synonym		TRO
Piper subbullatum K.Schum. & Lauterb.	Unresolved		WCSP (in review)
Piper subcaniramum C.DC.	Unresolved		WCSP (in review)
Piper subcaudatum Trel.	Accepted		TRO
Piper subcaudatum var. maternale (Trel.) Yunck.	Synonym		TRO
Piper subcinereum C. DC.	Accepted		TRO
Piper subcitrifolium C. DC.	Synonym		TRO
Piper subconcinnum C.DC.	Unresolved		WCSP (in review)
Piper subcordata Hayata	Synonym		TRO
Piper subcordatum (Miq.) C. DC.	Accepted		TRO
Piper subcordulatum Trel.	Accepted		TRO
Piper subcrassifolium Yunck.	Synonym		WCSP (in review)
Piper subcrenulatum C.DC.	Unresolved		WCSP (in review)
Piper subdilatatum Trel.	Synonym		TRO
Piper subdivaricatum Trel.	Synonym		TRO
Piper subduidaense Yunck.	Accepted		WCSP (in review)
Piper subdurum Trel.	Synonym		TRO
Piper subeburneum Trel. & Standl.	Unresolved		WCSP (in review)
Piper subepunctatum C.DC.	Unresolved		WCSP (in review)
Piper suberythrocarpum C. DC.	Synonym		TRO
Piper subfalcatum Yunck.	Unresolved		WCSP (in review)
Piper subflavicans Trel.	Accepted		TRO
Piper subflavirameum C.DC.	Unresolved		WCSP (in review)
Piper subflavispicum C. DC.	Accepted		TRO
Piper subflavum C. DC.	Accepted		TRO
Piper subflavum var. espejuelanum (C. DC.) Trel. & Yunck.	Accepted		TRO
Piper subfragile C.DC.	Unresolved		WCSP (in review)
Piper subfrutescens Trel. & Yunck.	Unresolved		WCSP (in review)
Piper subfuscum C. DC.	Synonym		TRO
Piper subglabribracteatum C. DC.	Accepted		TRO
Piper subglabrifolium C.DC.	Unresolved		WCSP (in review)
Piper subglabrum C.DC.	Unresolved		WCSP (in review)
Piper subglaucescens C. DC.	Synonym		TRO
Piper subglaucum C.DC.	Unresolved		WCSP (in review)
Piper subgrande Ridl.	Unresolved		WCSP (in review)
Piper subhirsutum Trel.	Synonym		TRO
Piper subhirsutum var. tomentosicaule Trel.	Synonym		TRO
Piper sublaevifolium Trel.	Synonym		TRO
Piper sublepidotum Yunck.	Unresolved		WCSP (in review)
Piper sublignosum Yunck.	Accepted		WCSP (in review)
Piper sublineatum Kuntze	Synonym		TRO
Piper submarginense C. DC.	Unresolved		TRO
Piper submelanostictum C.DC.	Synonym		WCSP (in review)
Piper submelanostictum var. amelanostictum Yunck.	Synonym		WCSP (in review)
Piper submelanostictum var. submelanostictum	Synonym		TRO
Piper submolle Trel.	Synonym		TRO
Piper submultinerve C. DC.	Accepted		TRO
Piper submultiplinerve C. DC.	Synonym		TRO
Piper subnitidifolium Yunck.	Accepted		TRO
Piper subnitidum C. DC.	Accepted		TRO
Piper subnudibracteum C. DC.	Synonym		TRO
Piper subnudilimbum C.DC.	Unresolved		WCSP (in review)
Piper subnudispicum Trel.	Synonym		TRO
Piper subpanduriforme C.DC.	Unresolved		WCSP (in review)
Piper subpatens Trel.	Accepted		TRO
Piper subpedale Trel. & Yunck.	Accepted		TRO
Piper subpedicellatum Van Heurck & Müll.Arg.	Unresolved		WCSP (in review)
Piper subpeltatum Willd.	Synonym		TRO
Piper subpenninerve Ridl.	Unresolved		WCSP (in review)
Piper subprostratum C.DC.	Unresolved		WCSP (in review)
Piper subpuberulum Trel.	Unresolved		WCSP (in review)
Piper subpubibracteum C.DC.	Unresolved		WCSP (in review)
Piper subpurpureum C.DC.	Unresolved		WCSP (in review)
Piper subquadratum Trel.	Synonym		TRO
Piper subquinquenerve Trel.	Accepted		TRO
Piper subrectinerve C.DC.	Unresolved		WCSP (in review)
Piper subrepens Trel.	Accepted		TRO
Piper subrigidilimbum C.DC.	Unresolved		WCSP (in review)
Piper subrotundum Haw.	Synonym		TRO
Piper subrubrispicum C.DC.	Unresolved		WCSP (in review)
Piper subrugosum Yunck.	Accepted		WCSP (in review)
Piper subscabridum C.DC.	Unresolved		WCSP (in review)
Piper subscandens C.DC.	Unresolved		WCSP (in review)
Piper subscutatum (Miq.) C. DC.	Accepted		TRO
Piper subseptemnervium (Miq.) C. DC.	Accepted		TRO
Piper subsericeum Trel.	Synonym		TRO
Piper subsessile Trel.	Synonym		TRO
Piper subsessilifolium C. DC.	Accepted		TRO
Piper subsessililimbum C.DC.	Unresolved		WCSP (in review)
Piper subsilvestre C. DC.	Accepted		TRO
Piper subsilvulanum C. DC.	Accepted		TRO
Piper substenocarpum C. DC.	Synonym		TRO
Piper substilosum Yunck.	Unresolved		WCSP (in review)
Piper substomentosum Trel. & Yunck.	Synonym		TRO
Piper subtextum Trel.	Synonym		TRO
Piper subtrinerve Trel.	Synonym		TRO
Piper subtrinerve var. harveyanum Trel.	Synonym		TRO
Piper subtropicum C. DC.	Synonym		TRO
Piper subtropicum var. pachystachyum C. DC.	Synonym		TRO
Piper subulatum C.DC.	Unresolved		WCSP (in review)
Piper subvariabile Trel.	Synonym		TRO
Piper subvirosum C.DC.	Unresolved		WCSP (in review)
Piper subzhorquinense C. DC. ex Trel.	Synonym		TRO
Piper sucreense Trel. & Yunck.	Unresolved		WCSP (in review)
Piper suehippianum Trel. & Standl.	Unresolved		TRO
Piper suffrutescens C.DC.	Unresolved		WCSP (in review)
Piper suffruticosum Trel.	Accepted		TRO
Piper suipigua Buch.-Ham. ex D. Don	Accepted		TRO
Piper sulcatum Sodiro	Synonym		TRO
Piper sulcinerve Urb.	Unresolved		WCSP (in review)
Piper sulcinervosum Trel.	Synonym		TRO
Piper sumatranum (Miq.) C. DC.	Accepted		TRO
Piper sumideranum Trel.	Synonym		TRO
Piper sumpi Trel.	Accepted		TRO
Piper sundaicum Blume	Unresolved		WCSP (in review)
Piper supernum Trel. & Yunck.	Accepted		TRO
Piper surinamense C.DC.	Synonym		WCSP (in review)
Piper surubresanum Trel.	Synonym		TRO
Piper suspectum Trel.	Synonym		TRO
Piper svidaefolium Trel.	Synonym		TRO
Piper swartzianum (Miq.) C. DC.	Accepted		TRO
Piper swartzii C.DC.	Unresolved		WCSP (in review)
Piper sylvaticum Roxb.	Accepted		TRO
Piper sylvestre Lam.	Accepted		TRO
Piper syringifolium Balb. ex Kunth [Illegitimate]	Synonym		WCSP (in review)
Piper szemaoense C. DC.	Synonym		TRO
Piper tabanicidum Trel.	Synonym		TRO
Piper tabasaranum Trel.	Synonym		TRO
Piper tabernillanum Trel.	Synonym		TRO
Piper tabernillanum var. anconense Trel.	Synonym		TRO
Piper tabinense Trel.	Accepted		TRO
Piper tablazosense C.DC.	Unresolved		WCSP (in review)
Piper taboganum C. DC.	Synonym		TRO
Piper tacamahaca Trel.	Synonym		TRO
Piper tacananum Trel. & Standl.	Unresolved		WCSP (in review)
Piper tacaresense Trel.	Synonym		TRO
Piper tacariguense Steyerm.	Accepted		WCSP (in review)
Piper tachiranum Yunck.	Accepted		WCSP (in review)
Piper tacticanum Trel. & Standl.	Unresolved		WCSP (in review)
Piper taiwanense Lin & Lu	Accepted		TRO
Piper tajumulccanum Trel. & Standl.	Unresolved		WCSP (in review)
Piper tajumulcoanum Trel. & Standl.	Unresolved		WCSP (in review)
Piper talamancanum Trel.	Synonym		TRO
Piper talbotii C.DC.	Unresolved		WCSP (in review)
Piper talinifolium (Kunth) Poir.	Synonym		TRO
Piper tamayoanum Steyerm.	Accepted		WCSP (in review)
Piper tapantiense Trel.	Synonym		TRO
Piper tapenbeckii K.Schum. & Lauterb. ex C.DC.	Unresolved		WCSP (in review)
Piper taperanum Yunck.	Accepted		WCSP (in review)
Piper taperinhanum Yunck.	Unresolved		WCSP (in review)
Piper tapianum Trel.	Synonym		TRO
Piper taquetii C.DC.	Unresolved		WCSP (in review)
Piper tarapotianum C. DC.	Synonym		TRO
Piper tardans Trel.	Synonym		TRO
Piper tardigranulatum Trel.	Unresolved		TRO
Piper tardum Trel.	Synonym		TRO
Piper tarrazuense Trel.	Synonym		TRO
Piper tatei Trel.	Synonym		TRO
Piper taumanum C.DC.	Unresolved		WCSP (in review)
Piper tectoniaefolium (Kunth) Kunth ex C. DC.	Accepted		TRO
Piper tecumense Trel.	Accepted		TRO
Piper tecutlanum Trel. & Standl.	Synonym		TRO
Piper tejucense (Miq.) C. DC.	Synonym		TRO
Piper telanum Trel.	Synonym		TRO
Piper telembi E.García	Unresolved		WCSP (in review)
Piper tembladorense Trel. ex L. Williams	Synonym		TRO
Piper temptum Trel.	Accepted		TRO
Piper tenebricosum Trel.	Accepted		TRO
Piper tenellum Sw.	Synonym		WCSP (in review)
Piper tentatum Trel.	Synonym		TRO
Piper tenue Kunth	Accepted		WCSP (in review)
Piper tenuiamentum C.DC.	Unresolved		WCSP (in review)
Piper tenuibracteum C.DC.	Unresolved		WCSP (in review)
Piper tenuiculispicum Trel. ex Yunck.	Synonym		TRO
Piper tenuicuspe (Miq.) C. DC.	Accepted		TRO
Piper tenuiflorum D.Dietr.	Unresolved		WCSP (in review)
Piper tenuiflorum Vahl	Unresolved		WCSP (in review)
Piper tenuifolium C. DC.	Synonym		TRO
Piper tenuilimbum C. DC.	Accepted		TRO
Piper tenuimucronatum C. DC.	Accepted		TRO
Piper tenuinerve C.DC.	Unresolved		WCSP (in review)
Piper tenuipedunculum C.DC.	Unresolved		WCSP (in review)
Piper tenuipes C. DC.	Synonym		TRO
Piper tenuirameum C.DC.	Unresolved		WCSP (in review)
Piper tenuispicatum Steud.	Unresolved		WCSP (in review)
Piper tenuispicum C. DC.	Synonym		TRO
Piper tenuistylum C. DC.	Synonym		TRO
Piper tepezontesense Trel.	Unresolved		WCSP (in review)
Piper tepicanum C.DC.	Unresolved		WCSP (in review)
Piper tepuiense Steyerm.	Accepted		WCSP (in review)
Piper tequendanense C.DC.	Unresolved		WCSP (in review)
Piper terminaliflorum Y.Q. Tseng	Synonym		TRO
Piper terminalispicum Standl.	Synonym		TRO
Piper terrabanum C. DC.	Accepted		TRO
Piper terronesense Trel.	Synonym		TRO
Piper terryae Standl.	Unresolved		WCSP (in review)
Piper tesseraespicum Trel.	Synonym		TRO
Piper tessmanni Trel.	Accepted		TRO
Piper tetragonum (Ruiz & Pav.) Vahl	Synonym		TRO
Piper tetraphyllum G.Forst.	Synonym		WCSP (in review)
Piper teysmanii (Miq.) C. DC.	Accepted		TRO
Piper thebaudianum Trel.	Unresolved		WCSP (in review)
Piper theobromifolium O.Schwartz	Unresolved		WCSP (in review)
Piper thermale Vahl	Unresolved		WCSP (in review)
Piper thiemeanum Trel.	Synonym		TRO
Piper thomasii Tebbs	Unresolved		WCSP (in review)
Piper thomsonii (C. DC.) Hook. f.	Accepted		TRO
Piper thomsonii var. thomsonii	Accepted		TRO
Piper thorelii C.DC.	Unresolved		WCSP (in review)
Piper thwaitesii C.DC.	Unresolved		WCSP (in review)
Piper tigerianum C. DC.	Synonym		TRO
Piper tiguanum C. DC.	Synonym		TRO
Piper tikalense Trel.	Synonym		TRO
Piper tilaranum Trel.	Synonym		TRO
Piper tiliifolium Schltdl. & Cham.	Synonym		TRO
Piper tiliifolium Desv. ex Ham.	Synonym		TRO
Piper tiliifolium var. paulownifolium C. DC.	Synonym		TRO
Piper timbiquinum C. DC.	Synonym		TRO
Piper timbuchianum Trel.	Accepted		TRO
Piper timothianum A.C.Sm.	Unresolved		WCSP (in review)
Piper tinctum Trel.	Synonym		TRO
Piper tingens Trel.	Synonym		TRO
Piper tithymaloides Vahl	Unresolved		WCSP (in review)
Piper tjambae C.DC.	Unresolved		WCSP (in review)
Piper tobagoanum C. DC.	Synonym		TRO
Piper tobagoanum var. humilior C. DC.	Synonym		TRO
Piper toboganum C. DC.	Synonym		TRO
Piper tocacheanum C. DC.	Accepted		TRO
Piper tolimae C. DC.	Synonym		TRO
Piper tomas-albertoi Trel. & Yunck.	Synonym		TRO
Piper tomasi Trel. ex T. Alberto	Synonym		TRO
Piper tomentosum Mill.	Unresolved		WCSP (in review)
Piper tomentosum Vahl	Unresolved		WCSP (in review)
Piper tomentosum C.DC.	Unresolved		WCSP (in review)
Piper tomohonum C.DC.	Unresolved		WCSP (in review)
Piper tonduzii C. DC.	Accepted		TRO
Piper tonduzii var. semiherbaceum Trel.	Synonym		TRO
Piper tonoroanum Trel. & Yunck.	Synonym		WCSP (in review)
Piper toppingii C.DC.	Unresolved		WCSP (in review)
Piper torbecanum Trel.	Unresolved		WCSP (in review)
Piper toronotepuiense Steyerm.	Accepted		WCSP (in review)
Piper torresanum Trel.	Synonym		TRO
Piper torricellense Lauterb.	Unresolved		WCSP (in review)
Piper tortivenulosum Yunck.	Accepted		WCSP (in review)
Piper tortivenulosum f. glabrum (Yunck.) Steyerm.	Accepted		TRO
Piper tortivenulosum var. glabrum Yunck.	Synonym		TRO
Piper tortivenulosum f. tortivenulosum	Accepted		TRO
Piper tortivenulosum var. tortivenulosum	Synonym		TRO
Piper tortuosipilum Trel.	Synonym		TRO
Piper tortuosivenosum Trel.	Accepted		TRO
Piper tovarense Trel. & Yunck.	Accepted		WCSP (in review)
Piper townsendii C. DC.	Accepted		TRO
Piper trachydermum Trel.	Synonym		WCSP (in review)
Piper trachyphyllum C. DC.	Accepted		TRO
Piper trachyphyllum var. latifolium C. DC.	Synonym		TRO
Piper tractifolium Trel.	Synonym		TRO
Piper translucens Yunck.	Accepted		WCSP (in review)
Piper transpontinum Trel.	Accepted		TRO
Piper treleaseanum Britton & P. Wilson	Synonym		TRO
Piper trianae C. DC.	Accepted		TRO
Piper triandrum F.Muell.	Unresolved		WCSP (in review)
Piper triangulare Chew ex P.Royen	Unresolved		WCSP (in review)
Piper tricarinatum Haw.	Unresolved		WCSP (in review)
Piper trichocarpon C.DC.	Accepted		WCSP (in review)
Piper trichocladum C. DC.	Synonym		TRO
Piper trichogynum C.DC.	Unresolved		WCSP (in review)
Piper trichoneuron (Miq.) C. DC.	Accepted		TRO
Piper trichophlebium Trel.	Synonym		TRO
Piper trichophyllum C.DC.	Unresolved		WCSP (in review)
Piper trichopodum C.DC.	Unresolved		WCSP (in review)
Piper trichopus Trel.	Synonym		TRO
Piper trichorhachis C. DC.	Accepted		TRO
Piper trichostachyon (Miq.) C. DC.	Accepted		TRO
Piper trichostylopse Trel.	Accepted		TRO
Piper trichostylum C. DC.	Accepted		TRO
Piper tricolor Y.Q. Tseng	Accepted		TRO
Piper tricuspe (Miq.) C. DC.	Accepted		TRO
Piper tridentipilum C. DC.	Accepted		TRO
Piper trifolium L.	Synonym		TRO
Piper trigoniastrifolium C.DC.	Unresolved		WCSP (in review)
Piper trigonioideum C.DC.	Unresolved		WCSP (in review)
Piper trigonocarpum Trel.	Unresolved		WCSP (in review)
Piper trigonodrupum Yunck.	Unresolved		WCSP (in review)
Piper trigonum C.DC.	Accepted		WCSP (in review)
Piper trimetrale C.DC.	Unresolved		WCSP (in review)
Piper trinerve (Ruiz & Pav.) Vahl	Synonym		TRO
Piper trinerve (Miq.) C. DC.	Synonym		TRO
Piper trineuron Miq.	Unresolved		WCSP (in review)
Piper trinitatis C. DC.	Synonym		TRO
Piper trioicum Roxb.	Unresolved		WCSP (in review)
Piper triquetrobaccum Trel.	Synonym		TRO
Piper triquetrobaccum var. tenuifolium Trel.	Synonym		TRO
Piper triquetrofructum Trel.	Synonym		TRO
Piper triquetrum Opiz	Unresolved		WCSP (in review)
Piper triseriale C. DC.	Synonym		TRO
Piper tristachyon C.DC.	Unresolved		WCSP (in review)
Piper tristachyum Poir.	Unresolved		WCSP (in review)
Piper tristemon C.DC.	Accepted		WCSP (in review)
Piper tristigmum Trel.	Accepted		TRO
Piper triumphale Trel.	Synonym		TRO
Piper trombek P.Royen	Unresolved		WCSP (in review)
Piper trukense Hosok.	Unresolved		TRO
Piper trultense Hosok.	Unresolved		WCSP (in review)
Piper truman-yunckeri Callejas	Accepted		TRO
Piper truncatibaccum C.DC.	Unresolved		WCSP (in review)
Piper truncatum Vell.	Accepted		TRO
Piper tsakianum C. DC.	Synonym		TRO
Piper tsangyuanense P.S. Chen & P.C. Zhu	Accepted		TRO
Piper tsengianum M.G. Gilbert & N.H. Xia	Accepted		TRO
Piper tsuritkubense Trel.	Synonym		TRO
Piper tuberculatum Jacq.	Accepted		WCSP (in review)
Piper tuberculatum var. alleni Trel.	Synonym		TRO
Piper tuberculatum var. cangrejalense Trel.	Synonym		TRO
Piper tuberculatum var. minus C.DC.	Synonym		WCSP (in review)
Piper tuberculatum var. obtusifolium C. DC.	Synonym		TRO
Piper tuberculatum var. rigidomembranaceum C.DC.	Synonym		WCSP (in review)
Piper tuberculatum var. scandens Trel. & Yunck.	Synonym		TRO
Piper tuberosum D.Dietr.	Unresolved		WCSP (in review)
Piper tucumanum C. DC.	Accepted		TRO
Piper tuerckheimii C. DC.	Accepted		TRO
Piper tumidicondyli Trel.	Synonym		TRO
Piper tumidinodum Yunck.	Unresolved		WCSP (in review)
Piper tumidipedunculatum Trel.	Unresolved		WCSP (in review)
Piper tumidipedunculum Trel.	Synonym		TRO
Piper tumidum Kunth	Accepted		TRO
Piper tumupasense Yunck.	Unresolved		WCSP (in review)
Piper tungurahuae Sodiro	Synonym		TRO
Piper turbense Trel.	Unresolved		WCSP (in review)
Piper turbinatum Noronha	Unresolved		WCSP (in review)
Piper turrialvanum C. DC.	Synonym		TRO
Piper turrialvanum var. magnifolium C. DC.	Synonym		TRO
Piper tutuilae C.DC.	Unresolved		WCSP (in review)
Piper tuxpenyana (Trel.) Lundell	Synonym		TRO
Piper uaupesense Yunck.	Synonym		TRO
Piper ubiqueasperum Trel.	Unresolved		WCSP (in review)
Piper ubiquescabridum Trel.	Unresolved		WCSP (in review)
Piper ucayalianum Trel.	Accepted		TRO
Piper udicola C.DC.	Unresolved		WCSP (in review)
Piper udimontanum C. DC.	Synonym		TRO
Piper udisilvestre C. DC.	Synonym		TRO
Piper uhdei C. DC.	Accepted		TRO
Piper ulceratum Trel.	Accepted		TRO
Piper uleanum Trel.	Unresolved		WCSP (in review)
Piper ulei C. DC.	Accepted		TRO
Piper ulvifolium K.Schum. & Lauterb.	Unresolved		WCSP (in review)
Piper umbellatum L.	Accepted		WCSP (in review)
Piper umbellatum var. glabrum C. DC.	Synonym		TRO
Piper umbellatum var. majus C. DC.	Synonym		TRO
Piper umbellatum var. subpeltatum (Willd.) C. DC.	Synonym		TRO
Piper umbellatum var. vestitum C. DC.	Synonym		TRO
Piper umbilicatum (Ruiz & Pav.) Vahl	Synonym		TRO
Piper umbraculum C. DC.	Synonym		TRO
Piper umbricola C. DC.	Accepted		TRO
Piper umbriense Trel. & Yunck.	Accepted		TRO
Piper umbrigaudens C. DC.	Synonym		TRO
Piper umbrosum Kunth	Synonym		TRO
Piper unauriculatum Trel.	Synonym		TRO
Piper uncatum Trel.	Synonym		TRO
Piper uncinulatum Ridl.	Unresolved		WCSP (in review)
Piper undeninervium C. DC.	Synonym		TRO
Piper unduavinum C. DC.	Synonym		TRO
Piper ungaramense C.DC.	Unresolved		WCSP (in review)
Piper unguiculatum Ruiz & Pav.	Accepted		TRO
Piper unguiculatum Poepp.	Synonym		TRO
Piper unguiculiferum Trel.	Synonym		TRO
Piper unillanum Trel. & Yunck.	Unresolved		WCSP (in review)
Piper urdanetanum C.DC.	Unresolved		WCSP (in review)
Piper urophyllum C. DC.	Accepted		TRO
Piper urostachyum Hemsl.	Accepted		TRO
Piper urubambanum Trel.	Accepted		TRO
Piper usaquemense (Trel.) Pérez Arbeláez	Synonym		TRO
Piper uspantanense C.DC. ex Donn.Sm.	Unresolved		WCSP (in review)
Piper usterii C.DC.	Unresolved		WCSP (in review)
Piper usumacintense Lundell	Unresolved		WCSP (in review)
Piper uvitanum C. DC.	Synonym		TRO
Piper uyucanum Standl. & L.O. Williams ex Ant. Molina	Synonym		TRO
Piper vaccinum Standl. & Steyerm.	Synonym		TRO
Piper vaginans C.DC.	Unresolved		WCSP (in review)
Piper vahlii D.Dietr.	Unresolved		WCSP (in review)
Piper valdivianum Callejas	Unresolved		WCSP (in review)
Piper valetudinari Trel.	Synonym		TRO
Piper valladolidense Yunck.	Accepted		TRO
Piper vallicola C. DC.	Synonym		TRO
Piper vanderveldeanum Trel.	Unresolved		WCSP (in review)
Piper varablancanum Trel.	Synonym		TRO
Piper variabile C. DC.	Synonym		TRO
Piper variabile var. obtentum Trel.	Synonym		TRO
Piper varibracteum C.DC.	Unresolved		WCSP (in review)
Piper variegatum (Ruiz & Pav.) Pers.	Accepted		TRO
Piper variegatum Kunth	Synonym		TRO
Piper variifolium (Miq.) C. DC.	Accepted		TRO
Piper variipilum C.DC.	Unresolved		WCSP (in review)
Piper variitrichum Yunck.	Synonym		TRO
Piper varium Trel.	Synonym		TRO
Piper vasculosum Wall.	Unresolved		WCSP (in review)
Piper vaupelii Lauterb.	Synonym		WCSP (in review)
Piper vellosoi Yunck.	Unresolved		WCSP (in review)
Piper velutibracteum C.DC.	Unresolved		WCSP (in review)
Piper velutinervium C.DC.	Unresolved		WCSP (in review)
Piper velutinibaccum C.DC.	Unresolved		WCSP (in review)
Piper velutininervosum Trel.	Accepted		TRO
Piper velutinovarium C. DC.	Accepted		TRO
Piper velutinum Kunth	Accepted		TRO
Piper venamoense Steyerm.	Accepted		WCSP (in review)
Piper veneralense Trel. & Yunck.	Accepted		TRO
Piper venezuelense C.DC.	Synonym		WCSP (in review)
Piper venosum (Miq.) C. DC.	Accepted		TRO
Piper ventoleranum Trel.	Synonym		TRO
Piper venturii Trel.	Synonym		TRO
Piper venturii var. yesoanum Trel.	Synonym		TRO
Piper venulosissimum Yunck.	Accepted		TRO
Piper venulosum Trel.	Synonym		TRO
Piper venustum Wall.	Unresolved		WCSP (in review)
Piper veraguense C.DC.	Accepted		WCSP (in review)
Piper veraguense var. mutisii (Trel. & Yunck.) Steyerm.	Synonym		TRO
Piper verbascifolium (Miq.) C. DC.	Accepted		TRO
Piper verbenanum C. DC.	Synonym		TRO
Piper veredianum Trel.	Accepted		TRO
Piper vergelense Trel. & Standl.	Unresolved		WCSP (in review)
Piper vermiculatum C.DC.	Unresolved		WCSP (in review)
Piper verruclifolium Trel.	Unresolved		WCSP (in review)
Piper verrucosum Sw.	Synonym		WCSP (in review)
Piper verrucosum Willd.	Synonym		TRO
Piper verruculaecaule Trel.	Accepted		TRO
Piper verruculaefolium Trel.	Accepted		TRO
Piper verruculaepetiolum Trel.	Synonym		TRO
Piper verruculigerum Trel.	Synonym		TRO
Piper verruculosum C. DC.	Accepted		TRO
Piper versteegii C.DC.	Unresolved		WCSP (in review)
Piper verticillatum L.	Synonym		TRO
Piper vestitifolium C. DC.	Synonym		TRO
Piper vestitum C.DC.	Unresolved		WCSP (in review)
Piper vexans Trel.	Synonym		TRO
Piper via-chicoense Yunck.	Accepted		TRO
Piper viae-marginis Trel.	Synonym		TRO
Piper vicinum Trel.	Synonym		TRO
Piper vicosanum Yunck.	Unresolved		WCSP (in review)
Piper victorianum C.DC.	Synonym		WCSP (in review)
Piper villalobosense Yunck.	Unresolved		WCSP (in review)
Piper villarrealii Yunck.	Unresolved		WCSP (in review)
Piper villibracteum C. DC.	Synonym		TRO
Piper villilimbum C.DC.	Unresolved		WCSP (in review)
Piper villipedunculum C.DC.	Unresolved		WCSP (in review)
Piper villipetiolatum Trel. ex Lundell	Unresolved		WCSP (in review)
Piper villirameum C.DC.	Unresolved		WCSP (in review)
Piper villiramulum C. DC.	Accepted		TRO
Piper villiramulum var. gamboanum (C. DC.) Trel.	Synonym		TRO
Piper villiramulum var. villiramulum C. DC.	Accepted		TRO
Piper villirhache C.DC.	Unresolved		WCSP (in review)
Piper villistipulum Trel.	Synonym		TRO
Piper villosispicum Trel.	Accepted		TRO
Piper villosisquamulum Trel.	Synonym		TRO
Piper villosissimum Yunck.	Unresolved		WCSP (in review)
Piper villosulum C.DC.	Unresolved		WCSP (in review)
Piper villosum C. DC.	Synonym		TRO
Piper viminale Opiz	Unresolved		WCSP (in review)
Piper viminifolium Trel.	Accepted		TRO
Piper virgatum Yunck.	Unresolved		WCSP (in review)
Piper virgenense Trel. & Yunck.	Unresolved		WCSP (in review)
Piper virginicum Trel. & Standl.	Unresolved		WCSP (in review)
Piper virgulticola Trel.	Synonym		TRO
Piper virgultorum C. DC.	Accepted		TRO
Piper viridibaccum Trel.	Unresolved		WCSP (in review)
Piper viridicaule Trel.	Accepted		TRO
Piper viridifolium Trel.	Synonym		TRO
Piper viridilimbum Trel.	Accepted		TRO
Piper viridispicum Trel.	Synonym		TRO
Piper viridistachyum Yunck.	Accepted		WCSP (in review)
Piper virillanum C. DC.	Synonym		TRO
Piper viscaianum Trel. & Yunck.	Synonym		TRO
Piper vitabile Trel.	Synonym		TRO
Piper vitaceum Yunck.	Accepted		WCSP (in review)
Piper vitibundum Trel.	Synonym		TRO
Piper viticaule Yunck.	Unresolved		WCSP (in review)
Piper vitiense A.C.Sm.	Unresolved		WCSP (in review)
Piper voigtii C.DC.	Unresolved		WCSP (in review)
Piper volkensii C.DC.	Unresolved		WCSP (in review)
Piper volubile C. DC.	Accepted		TRO
Piper wabagense W.L.Chew	Unresolved		WCSP (in review)
Piper wachenheimii Trel.	Accepted		WCSP (in review)
Piper wagneri C. DC.	Accepted		TRO
Piper wagneri var. minutispicum (C. DC.) Trel.	Synonym		TRO
Piper walkeri Miq.	Unresolved		WCSP (in review)
Piper wallichii (Miq.) Hand.-Mazz.	Accepted		TRO
Piper wallichii var. hupeense (C. DC.) Hand.-Mazz.	Synonym		TRO
Piper wangii M.G. Gilbert & N.H. Xia	Accepted		TRO
Piper warakaboura (Miq.) C. DC.	Synonym		TRO
Piper warburgii C.DC.	Unresolved		WCSP (in review)
Piper weddellii C.DC.	Unresolved		WCSP (in review)
Piper wedelii Yunck.	Synonym		TRO
Piper wenzelii C.DC.	Unresolved		WCSP (in review)
Piper werneri C.DC.	Unresolved		WCSP (in review)
Piper whiteae Trel.	Synonym		TRO
Piper wibomii Yunck.	Accepted		TRO
Piper wichmannii C. DC.	Synonym		TRO
Piper wightii Miq.	Unresolved		WCSP (in review)
Piper wilhelmense Chew ex P.Royen	Unresolved		WCSP (in review)
Piper willdenowii Kunth ex Miq.	Unresolved		WCSP (in review)
Piper williamsii Trel.	Synonym		TRO
Piper wilsonii Trel.	Synonym		TRO
Piper wingfieldii Steyerm.	Accepted		WCSP (in review)
Piper winkleri C.DC.	Unresolved		WCSP (in review)
Piper woytkowskii Yunck.	Accepted		TRO
Piper wrightii C.DC.	Unresolved		WCSP (in review)
Piper wulfschlaegelii C.DC.	Unresolved		WCSP (in review)
Piper wurdackii Yunck.	Synonym		WCSP (in review)
Piper wydlerianum C. DC.	Accepted		TRO
Piper xalapense C. DC.	Accepted		TRO
Piper xanthocarpum C.DC.	Unresolved		WCSP (in review)
Piper xanthocladum Trel. ex Standl. & S. Calderón	Unresolved		TRO
Piper xanthoneurum Trel.	Synonym		TRO
Piper xanthostachyum C. DC.	Accepted		TRO
Piper xapuryense C. DC.	Synonym		TRO
Piper xiroresanum C. DC.	Synonym		TRO
Piper xylopioides Kunth	Synonym		TRO
Piper xylosteoides (Kunth) Steud.	Accepted		TRO
Piper xylosteoides var. subauriculatum (Miq.) Yunck.	Accepted		TRO
Piper yaguarundi D.Parodi	Unresolved		WCSP (in review)
Piper yalochanum Trel.	Synonym		TRO
Piper yanaconasense Trel. & Yunck.	Unresolved		WCSP (in review)
Piper yananoanum Trel.	Accepted		TRO
Piper yapeanum Trel.	Synonym		TRO
Piper yaracuyense Yunck.	Accepted		WCSP (in review)
Piper yaxhanum Trel.	Synonym		TRO
Piper yessupianum Trel.	Accepted		TRO
Piper yinkiangense Y.Q. Tseng	Accepted		TRO
Piper ynesae Trel.	Unresolved		TRO
Piper yoroanum Trel.	Synonym		TRO
Piper yousei Trel.	Unresolved		WCSP (in review)
Piper yucatanense C. DC.	Accepted		TRO
Piper yui M.G. Gilbert & N.H. Xia	Accepted		TRO
Piper yunckeri Trel.	Synonym		TRO
Piper yunckeri var. latum Trel.	Synonym		TRO
Piper yungasanum Yunck.	Unresolved		WCSP (in review)
Piper yunnanense Y.Q. Tseng	Accepted		TRO
Piper yurimaguasanum Trel.	Synonym		TRO
Piper yurumalense Trel.	Synonym		TRO
Piper yzabalanum C. DC.	Accepted		TRO
Piper yzabalanum var. pubinerve Trel.	Synonym		TRO
Piper zacatense C. DC.	Accepted		TRO
Piper zacatense var. percaudatum C. DC.	Synonym		TRO
Piper zacuapanum C. DC.	Synonym		TRO
Piper zamboangae C.DC.	Unresolved		WCSP (in review)
Piper zarceroense Trel.	Synonym		TRO
Piper zarumanum Trel.	Accepted		TRO
Piper zedijodi Trel. ex L.O. Williams	Synonym		TRO
Piper zediogodiense Trel. ex L.O. Williams	Synonym		TRO
Piper zenkeri C.DC.	Unresolved		WCSP (in review)
Piper zentanum C.DC.	Unresolved		WCSP (in review)
Piper zeylanicum Miq.	Unresolved		WCSP (in review)
Piper zhorquinense C.DC.	Unresolved		WCSP (in review)
Piper zingiberinum Trel.	Synonym		TRO
Piper zippelia C.DC.	Synonym		WCSP (in review)
Piper zollingeri C.DC.	Unresolved		WCSP (in review)
Piper zollingerianum C.DC.	Unresolved		WCSP (in review)
Piper zonulatispicum Trel.	Synonym		TRO
Piper zuccarinii C.DC.	Unresolved		WCSP (in review)