The Plant List — A working list for all plant species

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733 plant name records match your search criteria Penstemon. The results are below.

The names found have these generic epithets:

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

Name Status Confi­dence level Source Date supplied
Penstemon abietinus Pennell Accepted M TRO
Penstemon aboriginum M.E.Jones Unresolved L WCSP (in review)
Penstemon absarokensis Evert Accepted M TRO
Penstemon acaulis L.O. Williams Accepted M TRO
Penstemon acuminatus Douglas ex Lindl. Accepted M TRO
Penstemon acuminatus var. congestus M.E. Jones Synonym L TRO
Penstemon adamsianus Howell Unresolved L WCSP (in review)
Penstemon aggregatus Pennell Synonym M TRO
Penstemon alamosensis Pennell & G.T. Nisbet Accepted M TRO
Penstemon albertinus Greene Accepted M TRO
Penstemon albidus Nutt. Accepted M TRO
Penstemon albifloris England Unresolved L WCSP (in review)
Penstemon albifluvis England Accepted M TRO
Penstemon albomarginatus M.E. Jones Accepted M TRO
Penstemon albrightii A.Nelson & J.F.Macbr. Unresolved L WCSP (in review)
Penstemon albrightii A.Nelson Unresolved L WCSP (in review)
Penstemon alluviorum Pennell Accepted M TRO
Penstemon alpinus Torr. Accepted M TRO
Penstemon alpinus subsp. brandegeei (Porter) Penland Synonym L TRO
Penstemon alpinus subsp. magnus (Pennell) Penland Accepted L TRO
Penstemon alpinus f. riparius (A. Nelson) Pennell Accepted L TRO
Penstemon alsinoides Greene Unresolved L WCSP (in review)
Penstemon amabilis G.N.Jones Unresolved L WCSP (in review)
Penstemon ambiguus Torr. Accepted M TRO
Penstemon ambiguus var. thurberi (Torr.) A. Gray Synonym L TRO
Penstemon ammophilus N.H. Holmgren & L.M. Shultz Accepted M TRO
Penstemon amoenus Kunze Unresolved L WCSP (in review)
Penstemon amphorellae Crosswh. Accepted M TRO
Penstemon amplexicaulis Moench Unresolved L WCSP (in review)
Penstemon amplexicaulis Buckley Unresolved L WCSP (in review)
Penstemon amplus A.Nelson Unresolved L WCSP (in review)
Penstemon angelicus (I.M. Johnst.) Moran Accepted M TRO
Penstemon anguineus Eastw. Accepted M TRO
Penstemon angustifolius Nutt. ex Pursh Accepted M TRO
Penstemon angustifolius var. angustifolius Synonym L TRO
Penstemon angustifolius subsp. caudatus (A. Heller) D.D. Keck Accepted L TRO
Penstemon angustifolius var. venosus (D.D. Keck) N.H. Holmgren Accepted L TRO
Penstemon angustifolius subsp. venosus D.D. Keck Synonym L TRO
Penstemon antirrhinoides Benth. Accepted M TRO
Penstemon antirrhinoides subsp. antirrhinoides Synonym L TRO
Penstemon antirrhinoides var. microphyllus (A. Gray) Munz & I.M. Johnst. Synonym L TRO
Penstemon apateticus Straw Accepted M TRO
Penstemon apateticus subsp. townsendianus Straw Synonym L TRO
Penstemon arenarius Greene Accepted M TRO
Penstemon arenicola A. Nelson Accepted M TRO
Penstemon argutus Paxton Unresolved L WCSP (in review)
Penstemon aridus Rydb. Accepted M TRO
Penstemon arizonicus A.Heller Unresolved L WCSP (in review)
Penstemon arkansanus Pennell Accepted M TRO
Penstemon assurgens D.D.Keck Unresolved L WCSP (in review)
Penstemon atropurpureus (Sweet) G. Don Accepted L TRO
Penstemon attenuatus Douglas ex Lindl. Accepted M TRO
Penstemon attenuatus var. attenuatus Synonym L TRO
Penstemon attenuatus subsp. attenuatus Synonym L TRO
Penstemon attenuatus var. militaris (Greene) Cronquist Accepted L TRO
Penstemon attenuatus var. palustris (Pennell) Cronquist Accepted L TRO
Penstemon attenuatus var. pseudoprocerus (Rydb.) Cronquist Accepted L TRO
Penstemon attenuatus var. varians A. Nelson Synonym L TRO
Penstemon atwoodii S.L. Welsh Accepted M TRO
Penstemon auriberbis Pennell Accepted M TRO
Penstemon auricomus A.Nelson ex Rydb. Unresolved L WCSP (in review)
Penstemon auricomus A.Nelson Unresolved L WCSP (in review)
Penstemon austinii Eastw. Synonym M TRO
Penstemon australis Small Accepted M TRO
Penstemon azureus Benth. Accepted M TRO
Penstemon azureus subsp. azureus Synonym L TRO
Penstemon azureus var. azureus Synonym L TRO
Penstemon azureus var. parvulus A. Gray Synonym L TRO
Penstemon azureus subsp. parvulus (A. Gray) D.D. Keck Accepted L TRO
Penstemon baccharifolius Hook. Accepted M TRO
Penstemon baccharifolius var. schaffneri Hemsl. Unresolved L WCSP (in review)
Penstemon bachimbensis Straw Unresolved L TRO
Penstemon bakeri Greene Unresolved L WCSP (in review)
Penstemon barbatus (Cav.) Roth Accepted L TRO
Penstemon barbatus var. barbatus Synonym L TRO
Penstemon barbatus var. labrosus A. Gray Synonym L TRO
Penstemon barbatus subsp. torreyi (Benth.) D.D. Keck Accepted L TRO
Penstemon barbatus subsp. trichander (A. Gray) D.D. Keck Accepted L TRO
Penstemon barbatus var. wislizeni A. Gray Synonym L TRO
Penstemon barnebyi N.H. Holmgren Accepted M TRO
Penstemon barrettiae A. Gray Accepted M TRO
Penstemon berryi Eastw. Synonym M TRO
Penstemon bicolor (Brandegee) Clokey & D.D. Keck Accepted M TRO
Penstemon bolanus Straw Accepted M TRO
Penstemon brachyanthus Pennell Synonym M TRO
Penstemon bracteatus D.D. Keck Accepted M TRO
Penstemon bradburyi Pursh Accepted M TRO
Penstemon brandegeei (Porter) Rydb. Accepted M WCSP (in review)
Penstemon brevibarbatus Crosswhite Accepted M TRO
Penstemon breviculus (D.D. Keck) G.T. Nisbet & R.C. Jacks. Accepted M TRO
Penstemon breviflorus Lindl. Synonym M TRO
Penstemon brevifolius (A. Gray) A. Nelson Synonym M TRO
Penstemon brevilabris A.Gray Unresolved L WCSP (in review)
Penstemon brevis A.Nelson Unresolved L WCSP (in review)
Penstemon brevisepalus Pennell Accepted M WCSP (in review)
Penstemon brevisepalus f. brevisepalus Synonym L TRO
Penstemon bridgesii A. Gray Accepted M TRO
Penstemon brittoniorum Pennell Accepted M TRO
Penstemon brittonoruro Pennell ex Peattie Unresolved L WCSP (in review)
Penstemon × bryantiae D.D. Keck Accepted M TRO
Penstemon buckleyi Pennell Accepted M TRO
Penstemon cacuminis Pennell Unresolved L WCSP (in review)
Penstemon caelestinus Pennell Unresolved L WCSP (in review)
Penstemon caeruleum Nutt. Synonym M TRO
Penstemon caeruleus Bailly Unresolved L WCSP (in review)
Penstemon caesius A. Gray Accepted M TRO
Penstemon caespitosus Nutt. ex A. Gray Accepted M TRO
Penstemon caespitosus var. caespitosus Synonym L TRO
Penstemon caespitosus var. desertipicti (A. Nelson) N.H. Holmgren Accepted L TRO
Penstemon caespitosus var. suffruticosus A. Gray Synonym L TRO
Penstemon caespitosus subsp. suffruticosus (A. Gray) D.D. Keck Accepted L TRO
Penstemon calcareus Brandegee Accepted M TRO
Penstemon californicus (Munz & I.M. Johnst.) D.D. Keck Accepted M TRO
Penstemon calycosus Small Accepted M TRO
Penstemon campanulatus (Cav.) Willd. Accepted M WCSP (in review)
Penstemon campanulatus var. chihuahuensis (Straw) B.L. Turner Accepted L TRO
Penstemon campanulatus subsp. chihuahuensis Straw Synonym L TRO
Penstemon canescens (Britton) Britton Accepted M TRO
Penstemon canescens f. brittoniorum (Pennell) Fernald Accepted L TRO
Penstemon canescens subsp. brittoniorum (Pennell) Pennell Synonym L TRO
Penstemon canescens f. canescens Synonym L TRO
Penstemon canosobarbatum Kellogg Unresolved L TRO
Penstemon cardinalis Wooton & Standl. Accepted M TRO
Penstemon cardinalis subsp. regalis (A. Nelson) G.T. Nisbet & R.C. Jacks. Accepted L TRO
Penstemon cardwellii Howell Accepted M TRO
Penstemon carinatus Kellogg Unresolved L WCSP (in review)
Penstemon carnosus Pennell Accepted M TRO
Penstemon caryi Pennell Accepted M TRO
Penstemon caudatus A. Heller Synonym M TRO
Penstemon cedrosensis Krautter Accepted M TRO
Penstemon centranthifolius (Benth.) Benth. Accepted L TRO
Penstemon cephalanthus Pennell Unresolved L WCSP (in review)
Penstemon cephalophorus Greene Synonym M TRO
Penstemon cerrosensis Kellogg Accepted M TRO
Penstemon chionophilus Greene Unresolved L WCSP (in review)
Penstemon chionophilus Greene ex C.F.Baker Unresolved L WCSP (in review)
Penstemon cinerascens Greene Unresolved L WCSP (in review)
Penstemon cinerascens Greene ex C.F.Baker Unresolved L WCSP (in review)
Penstemon cinereus Piper Accepted M TRO
Penstemon cinereus subsp. cinereus Synonym L TRO
Penstemon cinicola D.D. Keck Accepted M TRO
Penstemon cleburnei M.E. Jones Accepted M TRO
Penstemon clevelandii A. Gray Accepted M TRO
Penstemon clevelandii var. angelicus I.M. Johnst. Synonym L TRO
Penstemon clevelandii subsp. clevelandii Synonym L TRO
Penstemon clevelandii subsp. connatus (Munz & I.M. Johnst.) D.D. Keck Accepted L TRO
Penstemon clevelandii var. connatus Munz & I.M. Johnst. Synonym L TRO
Penstemon clutei A. Nelson Synonym M TRO
Penstemon cobaea Nutt. Accepted M TRO
Penstemon cobaea var. purpureus Pennell Synonym L TRO
Penstemon cobaea subsp. purpureus (Pennell) Pennell Accepted L TRO
Penstemon coccinatus Rydb. Unresolved L WCSP (in review)
Penstemon coccineus Engelm. Unresolved L WCSP (in review)
Penstemon coeruleus Torr. Unresolved L WCSP (in review)
Penstemon coeruleus Nutt. Unresolved L WCSP (in review)
Penstemon collinus A.Nelson Unresolved L WCSP (in review)
Penstemon coloradoensis A. Nelson Synonym M TRO
Penstemon coloradoensis subsp. sileri (A. Gray) Pennell Synonym L TRO
Penstemon colvillii Huber Unresolved L WCSP (in review)
Penstemon comarrhenus A. Gray Accepted M TRO
Penstemon compactus (D.D. Keck) Crosswh. Accepted M TRO
Penstemon concinnus D.D. Keck Accepted M TRO
Penstemon confertus Douglas ex Lindl. Accepted M TRO
Penstemon confertus var. aberrans M.E. Jones Synonym L TRO
Penstemon confertus var. attenuatus (Douglas ex Lindl.) M.E. Jones Accepted L TRO
Penstemon confertus var. geniculatus (Greene) Jeps. Accepted L TRO
Penstemon confertus var. globosus Piper Synonym L TRO
Penstemon confertus var. modestus (Greene) Jeps. Synonym L TRO
Penstemon confusus M.E. Jones Accepted M TRO
Penstemon confusus var. patens M.E. Jones Synonym L TRO
Penstemon congestus (M.E. Jones) Pennell Synonym M TRO
Penstemon connatifolius A. Nelson Synonym M TRO
Penstemon connatus Deppe Unresolved L WCSP (in review)
Penstemon cordatus M.Martens & Galeotti Unresolved L WCSP (in review)
Penstemon cordatus Walp. Unresolved L WCSP (in review)
Penstemon cordifolius Benth. Accepted M TRO
Penstemon corymbosus Benth. Accepted M TRO
Penstemon crandallii A. Nelson Accepted M TRO
Penstemon crandallii var. crandallii Synonym L TRO
Penstemon crandallii subsp. glabrescens (Pennell) D.D. Keck Accepted L TRO
Penstemon crandallii subsp. procumbens (Greene) D.D. Keck Accepted L TRO
Penstemon crandallii var. taosensis (D.D. Keck) G.T. Nisbet & R.C. Jacks. Accepted L TRO
Penstemon crassifolius Lindl. Unresolved L WCSP (in review)
Penstemon crassifolius Shuttlew. ex Benth. Unresolved L WCSP (in review)
Penstemon crassulus Wooton & Standl. Unresolved L WCSP (in review)
Penstemon × crideri A. Nelson Accepted M TRO
Penstemon cristatus Nutt. Unresolved L WCSP (in review)
Penstemon cusickii A. Gray Accepted M TRO
Penstemon cyananthus Hook. Accepted M TRO
Penstemon cyananthus var. brandegeei Porter Synonym L WCSP (in review)
Penstemon cyananthus var. cyananthus Synonym L TRO
Penstemon cyananthus subsp. longiflorus Pennell Synonym L TRO
Penstemon cyananthus var. subglaber (A. Gray) N.H. Holmgren Accepted L TRO
Penstemon cyaneus Pennell Accepted M TRO
Penstemon cyanocaulis Payson Accepted M TRO
Penstemon cyathophorus Rydb. Accepted M TRO
Penstemon dasyphyllus A. Gray Accepted M TRO
Penstemon davidsonii Greene Accepted M TRO
Penstemon davidsonii var. davidsonii Synonym L TRO
Penstemon dayanus Howell Synonym M TRO
Penstemon deamii Pennell Accepted M TRO
Penstemon deaveri Crosswh. Accepted M TRO
Penstemon debilis O'Kane & J.L. Anderson Accepted M TRO
Penstemon decurvus Pennell ex Crosswh. Unresolved L WCSP (in review)
Penstemon degeneri Crosswh. Accepted M TRO
Penstemon depressus Greene Unresolved L WCSP (in review)
Penstemon deserticola Piper Unresolved L WCSP (in review)
Penstemon desertipicti A. Nelson Synonym M TRO
Penstemon desertorum M.E.Jones Unresolved L WCSP (in review)
Penstemon deustus Douglas ex Lindl. Accepted M TRO
Penstemon deustus var. deustus Synonym L TRO
Penstemon deustus subsp. deustus Synonym L TRO
Penstemon deustus var. heterander (Torr. & A. Gray) Cronquist Accepted L TRO
Penstemon diffusus Douglas Unresolved L WCSP (in review)
Penstemon digitalis Nutt. ex Sims Accepted M TRO
Penstemon digitalis var. attenuatus (Douglas ex Lindl.) Trautv. Synonym L TRO
Penstemon digitalis var. gracilis (Nutt.) Trautv. Synonym L TRO
Penstemon dimorphus Kuntze Unresolved L WCSP (in review)
Penstemon diphyllus Rydb. Accepted M TRO
Penstemon discolor D.D. Keck Accepted M TRO
Penstemon dissectus Elliott Accepted M TRO
Penstemon distans N.H. Holmgren Accepted M TRO
Penstemon divergens M.E.Jones Unresolved L WCSP (in review)
Penstemon dolius M.E. Jones ex Pennell Accepted M TRO
Penstemon dolius var. dolius Synonym L TRO
Penstemon douglasii Hook. Unresolved L WCSP (in review)
Penstemon × dubius Davidson Unresolved L TRO
Penstemon duchesnensis (N.H. Holmgren) Neese Accepted M TRO
Penstemon eastwoodiae A.Heller Unresolved L WCSP (in review)
Penstemon eatonii A. Gray Accepted M TRO
Penstemon eatonii subsp. eatonii Synonym L TRO
Penstemon eatonii var. eatonii Synonym L TRO
Penstemon eatonii subsp. exsertus (A. Nelson) D.D. Keck Accepted L TRO
Penstemon × edithae English Unresolved L WCSP (in review)
Penstemon elegans Poir. Unresolved L WCSP (in review)
Penstemon elegantulus Pennell Accepted M TRO
Penstemon ellipticus J.M. Coult. & Fisher Accepted M TRO
Penstemon erianthera Fraser ex Nutt. Unresolved L WCSP (in review)
Penstemon eriantherus Pursh Accepted M TRO
Penstemon eriantherus var. eriantherus Synonym L TRO
Penstemon eriantherus subsp. saliens (Rydb.) Pennell Accepted L TRO
Penstemon eriantherus var. whitedii (Piper) A. Nelson Accepted L TRO
Penstemon erosus Rydb. Unresolved L WCSP (in review)
Penstemon euglaucus English Accepted M TRO
Penstemon exilifolius A. Nelson Synonym M TRO
Penstemon eximius D.D. Keck Accepted M TRO
Penstemon exsertus A. Nelson Synonym M TRO
Penstemon fasciculatus A. Gray Accepted M TRO
Penstemon fendleri Torr. & A. Gray Accepted M TRO
Penstemon filifolius Nutt. ex Benth. Unresolved L WCSP (in review)
Penstemon filiformis (D.D. Keck) D.D. Keck Accepted M TRO
Penstemon filisepalis Straw Accepted M TRO
Penstemon flavescens Pennell Accepted M TRO
Penstemon flaviflorus M.E.Jones Unresolved L WCSP (in review)
Penstemon floribundus Danley Accepted M TRO
Penstemon floridus Brandegee Accepted M TRO
Penstemon floridus var. austinii (Eastw.) N.H. Holmgren Accepted L TRO
Penstemon floridus subsp. floridus Synonym L TRO
Penstemon floridus var. floridus Synonym L TRO
Penstemon flowersii Neese & S.L. Welsh Accepted M TRO
Penstemon formosus A. Nelson Synonym M TRO
Penstemon francisci-pennellii Crosswh. Synonym M TRO
Penstemon franklinii S.L.Welsh Unresolved L WCSP (in review)
Penstemon fremontii Torr. & A. Gray Accepted M TRO
Penstemon fremontii var. subglaber A. Gray Synonym L TRO
Penstemon frutescens Lamb. Synonym M TRO
Penstemon fruticiformis Coville Accepted M TRO
Penstemon fruticiformis subsp. fruticiformis Synonym L TRO
Penstemon fruticiformis var. fruticiformis Synonym L TRO
Penstemon fruticosus (Pursh) Greene Accepted L TRO
Penstemon fruticosus var. fruticosus Synonym L TRO
Penstemon fruticosus subsp. fruticosus Synonym L TRO
Penstemon fruticosus var. scouleri (Lindl.) Cronquist Accepted L TRO
Penstemon gairdneri Hook. Accepted M TRO
Penstemon gairdneri var. gairdneri Synonym L TRO
Penstemon gairdneri subsp. gairdneri Synonym L TRO
Penstemon gairdneri subsp. hians (Piper) D.D. Keck Accepted L TRO
Penstemon gairdneri var. hians Piper Synonym L TRO
Penstemon gairdneri subsp. oreganus (A. Gray) D.D. Keck Accepted L TRO
Penstemon galloensis G.L. Nesom Accepted M TRO
Penstemon garrettii Pennell Synonym M WCSP (in review)
Penstemon geniculatus Greene Synonym M TRO
Penstemon gentianoides (Kunth) Poir. Accepted M WCSP (in review)
Penstemon gentryi Standl. Accepted M TRO
Penstemon gibbensii Dorn Accepted M TRO
Penstemon giganteus C.Morren Unresolved L WCSP (in review)
Penstemon glaber Pursh Accepted M TRO
Penstemon glaber var. brandegeei (Porter) C.C. Freeman Synonym L TRO
Penstemon glaber var. glaber Synonym L TRO
Penstemon glaberrimus Bevis ex W.H.Baxter Unresolved L WCSP (in review)
Penstemon glabrescens Pennell Synonym M TRO
Penstemon glandulosus Douglas ex Lindl. Accepted M TRO
Penstemon glandulosus subsp. glandulosus Synonym L TRO
Penstemon glastifolius Greene Unresolved L WCSP (in review)
Penstemon glaucifolius A.Gray Unresolved L WCSP (in review)
Penstemon glaucinus Pennell Accepted M TRO
Penstemon glaucophyllus Scheele Unresolved L WCSP (in review)
Penstemon glaucus Graham Unresolved L WCSP (in review)
Penstemon glaucus var. stenosepalus A. Gray Synonym L TRO
Penstemon globosus (Piper) Pennell & see Keck, David Daniels Accepted M TRO
Penstemon gloxinioides hort. Unresolved L TRO
Penstemon goodrichii N.H. Holmgren Accepted M TRO
Penstemon gordonianus A.Gray Unresolved L WCSP (in review)
Penstemon gordonii Hook. Unresolved L WCSP (in review)
Penstemon gormanii Greene Accepted M WCSP (in review)
Penstemon gormanii f. gormanii Synonym L TRO
Penstemon gracilentus A. Gray Accepted M TRO
Penstemon gracilis Nutt. Accepted M WCSP (in review)
Penstemon gracilis var. gracilis Synonym L TRO
Penstemon gracilis var. wisconsinensis (Pennell) Fassett Accepted L TRO
Penstemon grahamii D.D. Keck ex E.H. Graham Accepted M TRO
Penstemon grandiflorus Nutt. Accepted M WCSP (in review)
Penstemon griffinii A.Nelson Unresolved L WCSP (in review)
Penstemon grinnellii Eastw. Accepted M TRO
Penstemon grinnellii subsp. grinnellii Synonym L TRO
Penstemon grinnellii var. grinnellii Synonym L TRO
Penstemon grinnellii var. scrophularioides (M.E. Jones) N.H. Holmgren Accepted L TRO
Penstemon guadalupensis A. Heller Accepted M TRO
Penstemon guadalupensis subsp. ernestii Pennell Synonym L TRO
Penstemon guadalupensis var. ernestii (Pennell) Cory Accepted L TRO
Penstemon hallii A. Gray Accepted M TRO
Penstemon hallii var. arizonicus A. Gray Synonym L TRO
Penstemon hansonii A.Nelson Unresolved L WCSP (in review)
Penstemon harbourii A. Gray Accepted M TRO
Penstemon harringtonii Penland Accepted M TRO
Penstemon hartwegii Benth. Accepted M TRO
Penstemon havardii A. Gray Accepted M TRO
Penstemon haydenii S. Watson Accepted M TRO
Penstemon helleri Small Accepted M TRO
Penstemon henricksonii Straw Accepted M TRO
Penstemon hesperius M. Peck Accepted M TRO
Penstemon heterander Torr. & A. Gray Synonym M TRO
Penstemon heterodoxus A. Gray Accepted M TRO
Penstemon heterodoxus var. cephalophorus (Greene) N.H. Holmgren Accepted L TRO
Penstemon heterodoxus subsp. heterodoxus Synonym L TRO
Penstemon heterodoxus var. heterodoxus Synonym L TRO
Penstemon heterophyllus Lindl. Accepted M TRO
Penstemon heterophyllus subsp. heterophyllus Synonym L TRO
Penstemon heterophyllus var. heterophyllus Synonym L TRO
Penstemon heterophyllus subsp. spinulosus (Wooton & Standl.) D.D. Keck Accepted L TRO
Penstemon hians I.M.Johnst. Unresolved L WCSP (in review)
Penstemon hidalgensis Straw Accepted M TRO
Penstemon higginsii (Neese) N.H. Holmgren & N.D. Atwood Accepted M TRO
Penstemon hintonii Straw Unresolved L WCSP (in review)
Penstemon hirsutus (L.) Willd. Accepted L TRO
Penstemon holmgrenii S.L.Clark Unresolved L WCSP (in review)
Penstemon humboldtii G.Don Unresolved L WCSP (in review)
Penstemon humilis Nutt. ex A. Gray Accepted M TRO
Penstemon humilis subsp. brevifolius (A. Gray) D.D. Keck Accepted L TRO
Penstemon humilis var. humilis Synonym L TRO
Penstemon humilis var. obtusifolius (Pennell) Reveal Accepted L TRO
Penstemon × hybridus Voss Unresolved L WCSP (in review)
Penstemon idahoensis N.D.Atwood & S.L.Welsh Unresolved L WCSP (in review)
Penstemon ilicifolius Nutt. ex Benth. Unresolved L WCSP (in review)
Penstemon imberbis (Kunth) Trautv. Accepted L TRO
Penstemon immanifestus N.H. Holmgren Accepted M TRO
Penstemon incanus (A. Gray) Tidestr. Accepted M TRO
Penstemon incertus Brandegee Accepted M TRO
Penstemon inermis Poir. Unresolved L WCSP (in review)
Penstemon inflatus Crosswh. Unresolved L WCSP (in review)
Penstemon interruptus Greene Unresolved L WCSP (in review)
Penstemon intonsus A.Heller Unresolved L WCSP (in review)
Penstemon isophyllus B.L. Rob. Accepted M TRO
Penstemon jacintensis Abrams Synonym M TRO
Penstemon jaffrayanus Hook. Unresolved L WCSP (in review)
Penstemon jaffrayanus var. parvulus (A. Gray) Jeps. Synonym L TRO
Penstemon jaliscensis B.L. Rob. Accepted M TRO
Penstemon jamesii Benth. Accepted M TRO
Penstemon jamesii subsp. breviculus D.D. Keck Synonym L TRO
Penstemon janishiae N.H. Holmgren Accepted M TRO
Penstemon jeffreyanus A.Murray bis Unresolved L WCSP (in review)
Penstemon jonesii Pennell Accepted M TRO
Penstemon keckii Clokey Accepted M TRO
Penstemon kennedyi A. Nelson Synonym M TRO
Penstemon kingii S. Watson Accepted M TRO
Penstemon kleei Greene Synonym M TRO
Penstemon kunthii G. Don Accepted M TRO
Penstemon labrosus (A. Gray) Mast. ex Hook. f. Accepted M TRO
Penstemon lacerellus Greene Unresolved L WCSP (in review)
Penstemon laetus A. Gray Accepted M TRO
Penstemon laetus subsp. filiformis D.D. Keck Synonym L TRO
Penstemon laetus var. filiformis (D.D. Keck) McMinn Synonym L TRO
Penstemon laetus subsp. laetus Synonym L TRO
Penstemon laetus var. laetus Synonym L TRO
Penstemon laevigatus Soland. Accepted M TRO
Penstemon laevigatus Aiton Unresolved L TRO
Penstemon laevigatus var. calycosus (Small) Farw. Synonym L TRO
Penstemon laevigatus subsp. calycosus (Small) R.W. Benn. Accepted L TRO
Penstemon laevigatus var. canescens Britton Synonym L TRO
Penstemon laevis Pennell Accepted M TRO
Penstemon lanceolatus Benth. Accepted M TRO
Penstemon laricifolius Hook. & Arn. Accepted M TRO
Penstemon laricifolius subsp. exilifolius (A. Nelson) D.D. Keck Accepted L TRO
Penstemon laricifolius var. exilifolius (A. Nelson) Payson Synonym L TRO
Penstemon lassenianus Greene Unresolved L WCSP (in review)
Penstemon latifolius Hoffmanns. Unresolved L WCSP (in review)
Penstemon latifolius Krautter Unresolved L WCSP (in review)
Penstemon latiusculus Greene Unresolved L WCSP (in review)
Penstemon laxiflorus Pennell Accepted M TRO
Penstemon laxus A. Nelson Accepted M TRO
Penstemon leiophyllus Pennell Accepted M TRO
Penstemon leiophyllus var. francisci-pennellii (Crosswh.) N.H. Holmgren Accepted L TRO
Penstemon leiophyllus var. leiophyllus Synonym L TRO
Penstemon lemhiensis (D.D. Keck) D.D. Keck & Cronquist Accepted M TRO
Penstemon lemmonii A. Gray Accepted M TRO
Penstemon lentus Pennell Accepted M TRO
Penstemon lentus var. lentus Synonym L TRO
Penstemon leonardii Rydb. Accepted M TRO
Penstemon leonensis Straw Accepted M TRO
Penstemon leptanthus Pennell Unresolved L WCSP (in review)
Penstemon leptophyllus Rydb. Unresolved L WCSP (in review)
Penstemon leucanthus Greene Unresolved L WCSP (in review)
Penstemon lewisii Benth. Unresolved L WCSP (in review)
Penstemon linarioides A. Gray Accepted M TRO
Penstemon linarioides var. californicus Munz & I.M. Johnst. Synonym L TRO
Penstemon linarioides subsp. coloradoensis (A. Nelson) D.D. Keck Accepted L TRO
Penstemon linarioides var. seorsus A. Nelson Synonym L TRO
Penstemon linarioides subsp. sileri (A. Gray) D.D. Keck Accepted L TRO
Penstemon linarioides subsp. taosensis D.D. Keck Synonym L TRO
Penstemon linearifolius J.M.Coult. & Fisher Unresolved L WCSP (in review)
Penstemon lineolatus Greene Unresolved L WCSP (in review)
Penstemon lobbii Lem. Unresolved L WCSP (in review)
Penstemon longiflorus (Pennell) S.L. Clark Accepted M TRO
Penstemon longifolius Scheele Unresolved L WCSP (in review)
Penstemon luteus G.L. Nesom Accepted M TRO
Penstemon lyallii A. Gray Accepted M TRO
Penstemon macbridei A.Nelson Unresolved L WCSP (in review)
Penstemon × macewanii Paxton Unresolved L WCSP (in review)
Penstemon mackayanus Knowles & Westc. Unresolved L WCSP (in review)
Penstemon macranthus Eastw. Synonym M TRO
Penstemon magnus Pennell Synonym M TRO
Penstemon maguirei Crosswh. Unresolved L WCSP (in review)
Penstemon marcusii (D.D. Keck) N.H. Holmgren Accepted M TRO
Penstemon mensarum Pennell Accepted M TRO
Penstemon menziesii Hook. Unresolved L WCSP (in review)
Penstemon menziesii subsp. davidsonii (Greene) Piper Unresolved L TRO
Penstemon menziesii var. davidsonii (Greene) Piper Synonym L TRO
Penstemon metcalfei Wooton & Standl. Unresolved L WCSP (in review)
Penstemon mexicanus Benth. Unresolved L WCSP (in review)
Penstemon micranthus Nutt. Unresolved L WCSP (in review)
Penstemon micranthus Torr. Unresolved L WCSP (in review)
Penstemon microphyllus A. Gray Synonym M TRO
Penstemon militaris Greene Synonym M TRO
Penstemon miniatus Lindl. Accepted M TRO
Penstemon miniatus subsp. miniatus Synonym L TRO
Penstemon miniatus var. townsendianus (Straw) C.C.Freeman Accepted L TRO
Penstemon minidokanus A.Nelson & J.F.Macbr. Unresolved L WCSP (in review)
Penstemon minor (A. Gray) D.D. Keck Accepted M TRO
Penstemon minutifolius Straw Accepted M TRO
Penstemon × mirus A. Nelson Accepted M TRO
Penstemon miser A. Gray Accepted M TRO
Penstemon modestus Greene Synonym M TRO
Penstemon moffatii Eastw. Accepted M TRO
Penstemon moffatii subsp. marcusii D.D. Keck Synonym L TRO
Penstemon moffatii subsp. paysonii (Pennell) D.D. Keck Accepted L TRO
Penstemon mohinoranus Straw Accepted M TRO
Penstemon monoensis A. Heller Accepted M TRO
Penstemon montanus Greene Accepted M TRO
Penstemon montanus var. montanus Synonym L TRO
Penstemon moriahensis N.H. Holmgren Accepted M TRO
Penstemon moronensis Crosswh. Unresolved L WCSP (in review)
Penstemon mucronatus N.H. Holmgren Accepted M TRO
Penstemon multicaulis Pennell Accepted M TRO
Penstemon multiflorus (Benth.) Chapm. ex Small Accepted M TRO
Penstemon munzii I.M.Johnst. Unresolved L WCSP (in review)
Penstemon murrayanus Hook. Accepted M TRO
Penstemon nanus D.D. Keck Accepted M TRO
Penstemon navajoa N.H. Holmgren Accepted M TRO
Penstemon nelsoniae D.D.Keck & Thomps. Unresolved L WCSP (in review)
Penstemon nemorosus (Douglas ex Lindl.) Trautv. Synonym M WCSP (in review)
Penstemon neomexicanus Wooton & Standl. Accepted M TRO
Penstemon neotericus D.D. Keck Accepted M TRO
Penstemon newberryi A. Gray Accepted M TRO
Penstemon newberryi var. berryi (Eastw.) N.H. Holmgren Accepted L TRO
Penstemon newberryi subsp. newberryi Synonym L TRO
Penstemon newberryi var. newberryi Synonym L TRO
Penstemon newberryi var. rupicola Piper Synonym L TRO
Penstemon newberryi subsp. sonomensis (Greene) D.D. Keck Accepted L TRO
Penstemon nitidus Douglas ex Benth. Accepted M WCSP (in review)
Penstemon nitidus var. nitidus Synonym L TRO
Penstemon nudiflorus A. Gray Accepted M TRO
Penstemon nuttallii L.C.Beck Unresolved L WCSP (in review)
Penstemon nyeensis Crosswh. Unresolved L WCSP (in review)
Penstemon obtusifolius Pennell Synonym M TRO
Penstemon occiduus Straw Accepted M TRO
Penstemon oklahomensis Pennell Accepted M WCSP (in review)
Penstemon oliganthus Wooton & Standl. Accepted M TRO
Penstemon ophianthus Pennell Accepted M TRO
Penstemon oreganus (A. Gray) Howell Synonym M TRO
Penstemon oregonensis A.Murray bis Unresolved L WCSP (in review)
Penstemon oreocharis Greene Accepted M TRO
Penstemon oreophilus Rydb. Unresolved L WCSP (in review)
Penstemon osterhoutii Pennell Accepted M TRO
Penstemon ovatus Douglas Accepted M TRO
Penstemon ovatus var. ovatus Synonym L TRO
Penstemon owenii A.Nelson Unresolved L WCSP (in review)
Penstemon pachyphyllus A. Gray ex Rydb. Accepted M TRO
Penstemon pachyphyllus var. congestus (M.E. Jones) N.H. Holmgren Accepted L TRO
Penstemon pachyphyllus var. pachyphyllus Synonym L TRO
Penstemon pahutensis N.H. Holmgren Accepted M TRO
Penstemon pallescens Osterh. Unresolved L WCSP (in review)
Penstemon pallidus Small Accepted M TRO
Penstemon palmeri A. Gray Accepted M TRO
Penstemon palmeri var. bicolor Brandegee Synonym L TRO
Penstemon palmeri var. macranthus (Eastw.) N.H. Holmgren Accepted L TRO
Penstemon palmeri var. palmeri Synonym L TRO
Penstemon palustris Pennell Synonym M TRO
Penstemon pandus (A. Nelson & J.F. Macbr.) A. Nelson & J.F. Macbr. Accepted M TRO
Penstemon paniculatus Howell Unresolved L WCSP (in review)
Penstemon papillatus J.T. Howell Accepted M TRO
Penstemon parishii A. Gray Accepted M TRO
Penstemon × parishii A. Gray Unresolved L TRO
Penstemon parryi (A. Gray) A. Gray Accepted M TRO
Penstemon parviflorus Pennell Accepted M WCSP (in review)
Penstemon parvulus (A. Gray) Krautter Accepted M TRO
Penstemon parvus Pennell Accepted M TRO
Penstemon patens (M.E. Jones) N.H. Holmgren Accepted M TRO
Penstemon patricus N.H. Holmgren Accepted M TRO
Penstemon pauciflorus Buckley Accepted M TRO
Penstemon payettensis A. Nelson & J.F. Macbr. Accepted M TRO
Penstemon paysonii Pennell Synonym M TRO
Penstemon paysoniorum D.D. Keck Accepted M TRO
Penstemon peckii Pennell Accepted M TRO
Penstemon peduncularis Nutt. ex Benth. Unresolved L WCSP (in review)
Penstemon × peirsonii Munz & I.M. Johnst. Unresolved L TRO
Penstemon penlandii W.A. Weber Accepted M TRO
Penstemon pennellianus D.D. Keck Accepted M TRO
Penstemon pentstemon (L.) MacMill. Unresolved L WCSP (in review)
Penstemon perfoliatus Brongn. Accepted M TRO
Penstemon perpulcher A. Nelson Accepted M TRO
Penstemon perpulcher var. pandus A. Nelson & J.F. Macbr. Synonym L TRO
Penstemon personatus D.D. Keck Accepted M TRO
Penstemon petiolatus Brandegee Accepted M TRO
Penstemon phlogifolius Greene Unresolved L WCSP (in review)
Penstemon pickettii H.St.John Unresolved L WCSP (in review)
Penstemon pilifer A. Heller Synonym M TRO
Penstemon piliferus A.Heller Unresolved L WCSP (in review)
Penstemon pilosigulatus A.Nelson Unresolved L WCSP (in review)
Penstemon pinetorum Piper Unresolved L WCSP (in review)
Penstemon pinifolius Greene Accepted M TRO
Penstemon pinorum L. Shultz & J. Shultz Accepted M TRO
Penstemon plagapineus Straw Accepted M TRO
Penstemon platyphyllus Rydb. Accepted M TRO
Penstemon plummerae Abrams Unresolved L WCSP (in review)
Penstemon pononii auct. Unresolved L WCSP (in review)
Penstemon potosinus Straw Accepted M TRO
Penstemon pratensis Greene Accepted M TRO
Penstemon pringlei S.Watson Unresolved L WCSP (in review)
Penstemon procerus Douglas ex Graham Accepted M TRO
Penstemon procerus subsp. aberrans (M.E. Jones) D.D. Keck Accepted L TRO
Penstemon procerus var. brachyanthus (Pennell) Cronquist Accepted L TRO
Penstemon procerus var. formosus (A. Nelson) Cronquist Accepted L TRO
Penstemon procerus f. genuiculatus (Greene) L. Clark Synonym L TRO
Penstemon procerus var. modestus (Greene) N.H. Holmgren Accepted L TRO
Penstemon procerus var. procerus Synonym L TRO
Penstemon procerus f. procerus Synonym L TRO
Penstemon procerus var. tolmiei (Hook.) Cronquist Accepted L TRO
Penstemon procerus subsp. tolmiei (Hook.) D.D. Keck Synonym L TRO
Penstemon procumbens Greene Synonym M TRO
Penstemon productus Greene Unresolved L WCSP (in review)
Penstemon propinquus Greene Unresolved L WCSP (in review)
Penstemon pruinosus Douglas ex Lindl. Accepted M TRO
Penstemon pseudohumilis M.E.Jones Unresolved L WCSP (in review)
Penstemon pseudohumilis Rydb. Unresolved L WCSP (in review)
Penstemon pseudoparvus Crosswh. Unresolved L WCSP (in review)
Penstemon pseudoprocerus Rydb. Synonym M TRO
Penstemon pseudoputus (Crosswh.) N.H. Holmgren Accepted M TRO
Penstemon pseudospectabilis M.E. Jones Accepted M TRO
Penstemon pseudospectabilis subsp. bicolor (Brandegee) D.D. Keck Synonym L TRO
Penstemon pseudospectabilis subsp. clutei (A. Nelson) D.D. Keck Accepted L TRO
Penstemon pseudospectabilis subsp. connatifolius (A. Nelson) D.D. Keck Accepted L TRO
Penstemon pseudospectabilis subsp. pseudospectabilis Synonym L TRO
Penstemon puberulentus Rydb. Unresolved L WCSP (in review)
Penstemon puberulus Wooton & Standl. Unresolved L WCSP (in review)
Penstemon puberulus M.E.Jones Unresolved L WCSP (in review)
Penstemon pubescens Aiton Unresolved L WCSP (in review)
Penstemon pubescens var. gracilis (Nutt.) A. Gray Synonym L TRO
Penstemon pubescens var. multiflorus Benth. Synonym L TRO
Penstemon pudicus Reveal & Beatley Accepted M TRO
Penstemon pulchellus Lindl. Synonym M WCSP (in review)
Penstemon pumilus Nutt. Accepted M TRO
Penstemon pumilus var. incanus A. Gray Synonym L TRO
Penstemon pumilus var. thompsoniae A. Gray Synonym L TRO
Penstemon punctatus Brandegee Accepted M TRO
Penstemon puniceus Lilja Unresolved L WCSP (in review)
Penstemon puniceus A.Gray Unresolved L WCSP (in review)
Penstemon puniceus var. parryi A. Gray Synonym L TRO
Penstemon purpusii Brandegee Accepted M TRO
Penstemon putus A. Nelson Accepted M TRO
Penstemon radicosus A. Nelson Accepted M TRO
Penstemon ramaleyi A.Nelson Unresolved L WCSP (in review)
Penstemon ramosus Crosswh. Unresolved L WCSP (in review)
Penstemon rattanii A. Gray Accepted M TRO
Penstemon rattanii subsp. kleei (Greene) D.D. Keck Accepted L TRO
Penstemon rattanii var. minor A. Gray Synonym L TRO
Penstemon rattanii subsp. rattanii Synonym L TRO
Penstemon rattanii var. rattanii Synonym L TRO
Penstemon recurvatus A.Heller Unresolved L WCSP (in review)
Penstemon regalis A. Nelson Synonym M TRO
Penstemon retrorsoides Crosswh. Unresolved L TRO
Penstemon retrorsus Payson ex Pennell Accepted M TRO
Penstemon rex A.Nelson & J.F.Macbr. Unresolved L WCSP (in review)
Penstemon rhizomatosus N.H.Holmgren Unresolved L WCSP (in review)
Penstemon richardsonii Douglas ex Lindl. Accepted M TRO
Penstemon richardsonii var. richardsonii Synonym L TRO
Penstemon riparius A. Nelson Synonym M TRO
Penstemon rivularis Douglas ex Trautv. Unresolved L WCSP (in review)
Penstemon roezlii Regel Accepted M TRO
Penstemon roezlii var. violaceus Brandegee Synonym L TRO
Penstemon roseus (Cerv. ex Sweet) G. Don Accepted L TRO
Penstemon rostriflorus Kellogg Accepted M TRO
Penstemon rothrockii A. Gray Synonym M TRO
Penstemon rothrockii var. jacintensis (Abrams) Munz & I.M. Johnst. Synonym L TRO
Penstemon rotundifolius A. Gray Accepted M TRO
Penstemon rubescens A.Gray Unresolved L WCSP (in review)
Penstemon rubicundus D.D. Keck Accepted M TRO
Penstemon rupicola (Piper) Howell Accepted M TRO
Penstemon rydbergii A. Nelson Accepted M TRO
Penstemon rydbergii var. aggregatus (Pennell) N.H. Holmgren Accepted L TRO
Penstemon rydbergii subsp. aggregatus (Pennell) D.D. Keck Synonym L TRO
Penstemon rydbergii var. rydbergii Synonym L TRO
Penstemon rydbergii var. varians (A. Nelson) Cronquist Accepted L TRO
Penstemon sagittatus (D.D.Keck) Pennell Unresolved L WCSP (in review)
Penstemon saliens Rydb. Synonym M TRO
Penstemon saltarius Crosswh. Unresolved L WCSP (in review)
Penstemon saxosorum Pennell Accepted M TRO
Penstemon scabridus Eastw. Unresolved L WCSP (in review)
Penstemon scapoides D.D. Keck Accepted M TRO
Penstemon scariosus Pennell Accepted M TRO
Penstemon scariosus var. garrettii (Pennell) N.H.Holmgren Accepted L WCSP (in review)
Penstemon scariosus var. scariosus Synonym L TRO
Penstemon schaffneri (Hemsl.) Straw Unresolved L WCSP (in review)
Penstemon scoparius A.Nelson Unresolved L WCSP (in review)
Penstemon scouleri Lindl. Synonym M TRO
Penstemon scrophularioides M.E. Jones Synonym M TRO
Penstemon secundiflorus Benth. Accepted M TRO
Penstemon seorsus (A. Nelson) D.D. Keck Accepted M TRO
Penstemon sepalulus A. Nelson Accepted M TRO
Penstemon serrulatus Menzies ex Sm. Accepted M TRO
Penstemon shantzii A.Nelson Unresolved L WCSP (in review)
Penstemon shastensis D.D. Keck Accepted M TRO
Penstemon shockleyi S.Watson Unresolved L WCSP (in review)
Penstemon similis A.Nelson Unresolved L WCSP (in review)
Penstemon skutchii Straw Synonym M WCSP (in review)
Penstemon smallii A. Heller Accepted M TRO
Penstemon sonomensis Greene Synonym M TRO
Penstemon spathulatus Eastw. ex C.F.Baker Unresolved L WCSP (in review)
Penstemon spatulatus Pennell Accepted M TRO
Penstemon speciosus Douglas ex Lindl. Accepted M TRO
Penstemon speciosus subsp. kennedyi (A. Nelson) D.D. Keck Accepted L TRO
Penstemon speciosus subsp. lemhiensis D.D. Keck Synonym L TRO
Penstemon speciosus var. piliferus (A. Heller) Munz & I.M. Johnst. Accepted L TRO
Penstemon speciosus subsp. speciosus Synonym L TRO
Penstemon spectabilis Thurb. ex A. Gray Accepted M TRO
Penstemon spectabilis subsp. spectabilis Synonym L TRO
Penstemon spectabilis var. spectabilis Synonym L TRO
Penstemon spicatus auct. Unresolved L WCSP (in review)
Penstemon spinulosus Wooton & Standl. Synonym M TRO
Penstemon staticifolius Lindl. Unresolved L WCSP (in review)
Penstemon stenophyllus A. Gray Accepted M TRO
Penstemon stenosepalus (A. Gray) Howell Accepted M TRO
Penstemon stephensii Brandegee Accepted M TRO
Penstemon strictiformis Rydb. Accepted M TRO
Penstemon strictus Benth. Accepted M TRO
Penstemon subglaber Rydb. Accepted M TRO
Penstemon subserratus Pennell Accepted M TRO
Penstemon subulatus M.E. Jones Accepted M TRO
Penstemon sudans M.E. Jones Accepted M TRO
Penstemon suffrutescens Rydb. Unresolved L WCSP (in review)
Penstemon suffruticosus Douglas ex Benth. Unresolved L WCSP (in review)
Penstemon superbus A.Nelson Unresolved L WCSP (in review)
Penstemon tenellus Kellogg Unresolved L WCSP (in review)
Penstemon tenuiflorus Pennell Accepted M TRO
Penstemon tenuifolius Benth. Accepted M TRO
Penstemon tenuis Small Accepted M TRO
Penstemon tepicensis Straw Accepted M TRO
Penstemon teretiflorus Nutt. Unresolved L WCSP (in review)
Penstemon ternatus Torr. ex A. Gray Synonym M TRO
Penstemon ternatus var. septentrionalis Munz & I.M. Johnst. Synonym L TRO
Penstemon teucrioides Greene Accepted M TRO
Penstemon themisteri Bailly Unresolved L WCSP (in review)
Penstemon thompsoniae (A. Gray) Rydb. Accepted M TRO
Penstemon thurberi Torr. Accepted M TRO
Penstemon tidestromii Pennell Accepted M TRO
Penstemon tiehmii N.H.Holmgren Unresolved L WCSP (in review)
Penstemon tinctus Pennell Unresolved L WCSP (in review)
Penstemon tolmiei Hook. Synonym M TRO
Penstemon tolmiei subsp. modestus (Greene) D.D. Keck Synonym L TRO
Penstemon torreyi Benth. Synonym M TRO
Penstemon tracyi D.D. Keck Accepted M TRO
Penstemon trichander (A. Gray) Rydb. Synonym M TRO
Penstemon triflorus A. Heller Accepted M TRO
Penstemon triphyllus Douglas Accepted M TRO
Penstemon truncatus Pennell Unresolved L WCSP (in review)
Penstemon tubaeflorus Nutt. Accepted M TRO
Penstemon tubaeflorus var. tubaeflorus Synonym L TRO
Penstemon tubiflorus Nutt. Unresolved L WCSP (in review)
Penstemon tusharensis N.H.Holmgren Unresolved L WCSP (in review)
Penstemon tweedyi Canby & Rose Synonym M TRO
Penstemon uintahensis Pennell Accepted M TRO
Penstemon unilateralis Rydb. Accepted M TRO
Penstemon utahensis Eastw. Accepted M TRO
Penstemon variabilis Suksd. Accepted M TRO
Penstemon vaseyanus Greene Accepted M TRO
Penstemon venosus (D.D. Keck) Reveal Synonym M TRO
Penstemon venustus Douglas ex Lindl. Accepted M TRO
Penstemon veronicifolius Greene Unresolved L WCSP (in review)
Penstemon versicolor Pennell Unresolved L WCSP (in review)
Penstemon verticillatus M.Martens & Galeotti Unresolved L WCSP (in review)
Penstemon violaceus (Brandegee) A. Nelson Accepted M TRO
Penstemon virens Pennell ex Rydb. Accepted M TRO
Penstemon virgatus A. Gray Accepted M TRO
Penstemon virgatus var. arizonicus (A. Gray) D.D. Keck Accepted L TRO
Penstemon virgatus subsp. pseudoputus Crosswh. Synonym L TRO
Penstemon viscidulus Nees Unresolved L WCSP (in review)
Penstemon vizcainensis Moran Unresolved L WCSP (in review)
Penstemon vulcanellus Crosswh. Unresolved L WCSP (in review)
Penstemon wardii A. Gray Accepted M TRO
Penstemon washingtonensis D.D. Keck Accepted M TRO
Penstemon washoensis Greene Unresolved L WCSP (in review)
Penstemon watsonii A. Gray Accepted M TRO
Penstemon wendtiorum B.L.Turner Unresolved L WCSP (in review)
Penstemon wherryi Pennell Accepted M TRO
Penstemon whippleanus A. Gray Accepted M TRO
Penstemon whitedii Piper Synonym M TRO
Penstemon whitedii subsp. dayanus (Howell) D.D. Keck Unresolved L TRO
Penstemon wilcoxii Rydb. Accepted M TRO
Penstemon wisconsinensis Pennell Synonym M TRO
Penstemon wislizeni (A. Gray) Straw Accepted M TRO
Penstemon woodsii A.Nelson Unresolved L WCSP (in review)
Penstemon wrightii Hook. Accepted M TRO
Penstemon xylus A.Nelson Unresolved L WCSP (in review)
Penstemon yampaensis Penland Accepted M TRO