| Isoetes acadiensis Kott | Accepted |  | TRO |  | 
	
		| Isoetes adspersa A. Braun | Synonym |  | TRO |  | 
	
		| Isoetes aequinoctialis A. Braun | Accepted |  | TRO |  | 
	
		| Isoetes alata Small | Synonym |  | TRO |  | 
	
		| Isoetes alcalophila Halloy | Unresolved |  | TRO |  | 
	
		| Isoetes alpina Kirk | Unresolved |  | TRO |  | 
	
		| Isoetes alstonii C.F. Reed & Verdc. | Synonym |  | TRO |  | 
	
		| Isoetes × altonharvillii Musselman & R.D. Bray | Unresolved |  | TRO |  | 
	
		| Isoetes altonharvillii Musselman & R.D. Bray | Unresolved |  | TRO |  | 
	
		| Isoetes amazonica A. Braun | Accepted |  | TRO |  | 
	
		| Isoetes andicola (Amstutz) L.D. Gómez | Accepted |  | TRO |  | 
	
		| Isoetes andicola var. gemmifera (Rauh) L.D. Gómez | Synonym |  | TRO |  | 
	
		| Isoetes andina Spruce ex Hook. | Accepted |  | TRO |  | 
	
		| Isoetes appalachiana D.F. Brunt. & D.M. Britton | Accepted |  | TRO |  | 
	
		| Isoetes asiatica Makino | Accepted |  | TRO |  | 
	
		| Isoetes australis R.O. Williams | Unresolved |  | TRO |  | 
	
		| Isoetes azorica Durieu ex Milde | Unresolved |  | TRO |  | 
	
		| Isoetes baculata Hickey & H.P. Fuchs | Accepted |  | TRO |  | 
	
		| Isoetes beringensis Kom. | Synonym |  | TRO |  | 
	
		| Isoetes biafrana Alston | Accepted |  | TRO |  | 
	
		| Isoetes bischlerae H.P. Fuchs | Accepted |  | TRO |  | 
	
		| Isoetes bolanderi Engelm. | Accepted |  | TRO |  | 
	
		| Isoetes bolanderi var. bolanderi | Synonym |  | TRO |  | 
	
		| Isoetes bolanderi var. parryi Engelm. | Synonym |  | TRO |  | 
	
		| Isoetes bolanderi var. pygmaea (Engelm.) Clute | Accepted |  | TRO |  | 
	
		| Isoetes boliviensis U. Weber | Accepted |  | TRO |  | 
	
		| Isoetes boomii Luebke | Accepted |  | TRO |  | 
	
		| Isoetes boryana Durieu | Unresolved |  | TRO |  | 
	
		| Isoetes boyacensis H.P. Fuchs | Accepted |  | TRO |  | 
	
		| Isoetes brachyglossa A. Braun | Unresolved |  | TRO |  | 
	
		| Isoetes bradei Herter | Accepted |  | TRO |  | 
	
		| Isoetes braunii Unger | Unresolved |  | TRO |  | 
	
		| Isoetes braunii var. maritima (Underw.) N. Pfeiff. | Synonym |  | TRO |  | 
	
		| Isoetes brittonii D.F. Brunt. & W.C. Taylor | Unresolved |  | TRO |  | 
	
		| Isoetes brochoni Motelay | Unresolved |  | TRO |  | 
	
		| Isoetes bruntonii D. A. Knepper & Musselman | Unresolved |  | TRO |  | 
	
		| Isoetes butleri Engelm. | Accepted |  | TRO |  | 
	
		| Isoetes californica Engelm. | Synonym |  | TRO |  | 
	
		| Isoetes canadensis (Engelm.) A.A. Eaton | Synonym |  | TRO |  | 
	
		| Isoetes capensis var. stephansenii Schelpe | Unresolved |  | TRO |  | 
	
		| Isoetes carltaylori Musselman | Unresolved |  | TRO |  | 
	
		| Isoetes caroliniana (A.A. Eaton) Luebke | Accepted |  | TRO |  | 
	
		| Isoetes chapmanii (Engelm.) Small | Accepted |  | TRO |  | 
	
		| Isoetes cleefii H.P. Fuchs | Accepted |  | TRO |  | 
	
		| Isoetes colombiana (T.C. Palmer) H.P. Fuchs | Accepted |  | TRO |  | 
	
		| Isoetes coromandeliana L. f. | Synonym |  | TRO |  | 
	
		| Isoetes cubana Engelm. ex Baker | Accepted |  | TRO |  | 
	
		| Isoetes delilei Rothm. | Unresolved |  | TRO |  | 
	
		| Isoetes dichotoma L.E. Mora & W. Hagemann | Synonym |  | TRO |  | 
	
		| Isoetes dispora Hickey | Accepted |  | TRO |  | 
	
		| Isoetes divyadarshanii P.K. Shukla, G.K. Srivast. & S.K. Shukla | Unresolved |  | TRO |  | 
	
		| Isoetes dodgei A.A. Eaton | Unresolved |  | TRO |  | 
	
		| Isoetes dodgei B. & B. | Unresolved |  | TRO |  | 
	
		| Isoetes drummondii A. Braun | Unresolved |  | TRO |  | 
	
		| Isoetes duriei Bory | Synonym |  | TRO |  | 
	
		| Isoetes × eatonii R. Dodge (pro. sp.) | Unresolved |  | TRO |  | 
	
		| Isoetes eatonii R. Dodge | Unresolved |  | TRO |  | 
	
		| Isoetes echinospora Durieu | Accepted |  | TRO |  | 
	
		| Isoetes echinospora subsp. asiatica Á. Löve | Synonym |  | TRO |  | 
	
		| Isoetes echinospora var. bootii Engelm. | Synonym |  | TRO |  | 
	
		| Isoetes echinospora var. braunii Engelm. | Synonym |  | TRO |  | 
	
		| Isoetes echinospora var. echinospora | Synonym |  | TRO |  | 
	
		| Isoetes echinospora var. flettii A.A. Eaton | Synonym |  | TRO |  | 
	
		| Isoetes echinospora var. maritima (Underw.) A.A. Eaton | Synonym |  | TRO |  | 
	
		| Isoetes echinospora subsp. maritima (Underw.) Á. Löve | Synonym |  | TRO |  | 
	
		| Isoetes echinospora subsp. muricata (Durieu) Á. Löve & D. Löve | Synonym |  | TRO |  | 
	
		| Isoetes echinospora var. muricata (Durieu) Engelm. | Synonym |  | TRO |  | 
	
		| Isoetes echinospora var. robusta Engelm. | Synonym |  | TRO |  | 
	
		| Isoetes echinospora var. truncata A.A. Eaton | Synonym |  | TRO |  | 
	
		| Isoetes echtuckeri D.F. Brunt. & D.M. Britton | Unresolved |  | TRO |  | 
	
		| Isoetes ecuadoriensis Aspl. | Accepted |  | TRO |  | 
	
		| Isoetes ekmanii U. Weber | Unresolved |  | TRO |  | 
	
		| Isoetes elatior A. Braun | Unresolved |  | TRO |  | 
	
		| Isoetes engelmannii A. Braun | Accepted |  | TRO |  | 
	
		| Isoetes engelmannii var. caroliniana A.A. Eaton | Synonym |  | TRO |  | 
	
		| Isoetes engelmannii var. engelmannii | Synonym |  | TRO |  | 
	
		| Isoetes engelmannii var. valida Engelm. | Synonym |  | TRO |  | 
	
		| Isoetes erongoensis Wanntorp | Synonym |  | TRO |  | 
	
		| Isoetes eshbaughii Hickey | Accepted |  | TRO |  | 
	
		| Isoetes fairbrothersii J. D. Montgomery & W.C. Taylor | Unresolved |  | TRO |  | 
	
		| Isoetes flaccida A. Braun | Accepted |  | TRO |  | 
	
		| Isoetes flaccida var. alata (Small) N. Pfeiff. | Accepted |  | TRO |  | 
	
		| Isoetes flaccida var. flaccida | Synonym |  | TRO |  | 
	
		| Isoetes flettii (A.A. Eaton) N. Pfeiff. | Synonym |  | TRO |  | 
	
		| Isoetes foveolata A.A. Eaton ex R. Dodge | Accepted |  | TRO |  | 
	
		| Isoetes fuliginosa R.L. Small & Hickey | Unresolved |  | TRO |  | 
	
		| Isoetes gardneriana Kunze ex Mett. | Accepted |  | TRO |  | 
	
		| Isoetes georgiana Luebke | Accepted |  | TRO |  | 
	
		| Isoetes giessii Launert | Synonym |  | TRO |  | 
	
		| Isoetes gigantea U. Weber | Accepted |  | TRO |  | 
	
		| Isoetes glacialis Aspl. | Synonym |  | TRO |  | 
	
		| Isoetes goebelii U. Weber | Unresolved |  | TRO |  | 
	
		| Isoetes gravesii A.A. Eaton | Unresolved |  | TRO |  | 
	
		| Isoetes gunnii A. Braun | Unresolved |  | TRO |  | 
	
		| Isoetes habbemensis Alston | Unresolved |  | TRO |  | 
	
		| Isoetes × harveyi A.A. Eaton | Unresolved |  | TRO |  | 
	
		| Isoetes heldreichii Wettst. | Unresolved |  | TRO |  | 
	
		| Isoetes herzogii U. Weber | Accepted |  | TRO |  | 
	
		| Isoetes heterospora A.A. Eaton | Synonym |  | TRO |  | 
	
		| Isoetes hewitsonii Hickey | Accepted |  | TRO |  | 
	
		| Isoetes × hickeyi W.C. Taylor & Luebke | Unresolved |  | TRO |  | 
	
		| Isoetes hickeyi W.C. Taylor & Luebke | Unresolved |  | TRO |  | 
	
		| Isoetes hieroglyphica A.A. Eaton | Accepted |  | TRO |  | 
	
		| Isoetes hieronymii Weber | Unresolved |  | TRO |  | 
	
		| Isoetes histrix Bory & Durieu | Synonym |  | TRO |  | 
	
		| Isoetes hopei J.R. Croft | Unresolved |  | TRO |  | 
	
		| Isoetes howellii Engelm. | Accepted |  | TRO |  | 
	
		| Isoetes humilior A. Braun | Unresolved |  | TRO |  | 
	
		| Isoetes hyemalis D.F. Brunt. | Accepted |  | TRO |  | 
	
		| Isoetes hypsophila Hand.-Mazz. | Accepted |  | TRO |  | 
	
		| Isoetes hystrix Bory & Durieu | Unresolved |  | TRO |  | 
	
		| Isoetes indica Pant & Srivastava | Unresolved |  | TRO |  | 
	
		| Isoetes inflata E.R.L. Johnson | Unresolved |  | TRO |  | 
	
		| Isoetes jamaicensis Hickey | Unresolved |  | TRO |  | 
	
		| Isoetes japonica A. Br. | Unresolved |  | TRO |  | 
	
		| Isoetes jeffreyi D. M. Britton & D. F. Brunton | Unresolved |  | TRO |  | 
	
		| Isoetes junciformis D.F. Brunt. & D.M. Britton | Unresolved |  | TRO |  | 
	
		| Isoetes karstenii A. Braun | Accepted |  | TRO |  | 
	
		| Isoetes karstenii var. anomala (T.C. Palmer) R.L. Small & Hickey | Accepted |  | TRO |  | 
	
		| Isoetes karstenii var. karstenii | Synonym |  | TRO |  | 
	
		| Isoetes kersii Wanntorp | Synonym |  | TRO |  | 
	
		| Isoetes killipii C.V. Morton | Accepted |  | TRO |  | 
	
		| Isoetes kirkii A. Braun | Unresolved |  | TRO |  | 
	
		| Isoetes labri-draconis N.R. Crouch | Unresolved |  | TRO |  | 
	
		| Isoetes lacustris L. | Accepted |  | TRO |  | 
	
		| Isoetes lacustris subsp. hieroglyphica (A.A. Eaton) Taylor & Luebke | Synonym |  | TRO |  | 
	
		| Isoetes lacustris var. lacustris | Synonym |  | TRO |  | 
	
		| Isoetes lacustris var. paupercula Engelm. | Synonym |  | TRO |  | 
	
		| Isoetes laevis U. Weber | Synonym |  | TRO |  | 
	
		| Isoetes lechleri Mett. | Accepted |  | TRO |  | 
	
		| Isoetes lechleri var. anomala T.C. Palmer | Synonym |  | TRO |  | 
	
		| Isoetes lechleri var. colombiana T.C. Palmer | Synonym |  | TRO |  | 
	
		| Isoetes lechleri var. triquetra (A. Braun) L.D. Gómez | Accepted |  | TRO |  | 
	
		| Isoetes lineolata Dur. ex Motel. & Vendr. | Unresolved |  | TRO |  | 
	
		| Isoetes lithophila N. Pfeiff. | Accepted |  | TRO |  | 
	
		| Isoetes longissima Bory & Dur. | Synonym |  | TRO |  | 
	
		| Isoetes × louisianensis Thieret (pro. sp.) | Unresolved |  | TRO |  | 
	
		| Isoetes louisianensis Thieret | Accepted |  | TRO |  | 
	
		| Isoetes macounii A.A. Eaton | Synonym |  | TRO |  | 
	
		| Isoetes macrospora Durieu | Synonym |  | TRO |  | 
	
		| Isoetes macrospora var. heterospora (A.A. Eaton) A.A. Eaton | Unresolved |  | TRO |  | 
	
		| Isoetes macrospora f. hieroglyphica (A.A. Eaton) N. Pfeiff. | Unresolved |  | TRO |  | 
	
		| Isoetes mahadevensis G.K. Srivast., D.D. Pant & P.K. Shukla | Unresolved |  | TRO |  | 
	
		| Isoetes malinverniana Ces. & De Not. | Synonym |  | TRO |  | 
	
		| Isoetes maritima Underw. | Accepted |  | TRO |  | 
	
		| Isoetes martii A. Braun | Accepted |  | TRO |  | 
	
		| Isoetes mattaponica Musselman & W.C. Taylor | Unresolved |  | TRO |  | 
	
		| Isoetes melanopoda Gay & Durieu | Accepted |  | TRO |  | 
	
		| Isoetes melanopoda var. californica A.A. Eaton | Synonym |  | TRO |  | 
	
		| Isoetes melanopoda f. melanopoda | Synonym |  | TRO |  | 
	
		| Isoetes melanopoda var. pallida Engelm. | Synonym |  | TRO |  | 
	
		| Isoetes melanopoda f. pallida (Engelm.) Fernald | Accepted |  | TRO |  | 
	
		| Isoetes melanospora Engelm. | Accepted |  | TRO |  | 
	
		| Isoetes mexicana Underw. | Accepted |  | TRO |  | 
	
		| Isoetes michinokuana M.Takamiya, Mits.Watan. & K.Ono | Unresolved |  | TRO |  | 
	
		| Isoetes microvela D.F. Brunt. | Unresolved |  | TRO |  | 
	
		| Isoetes minima A.A. Eaton | Synonym |  | TRO |  | 
	
		| Isoetes montana U. Weber | Unresolved |  | TRO |  | 
	
		| Isoetes montezumae A.A. Eaton | Accepted |  | TRO |  | 
	
		| Isoetes muelleri A. Braun | Unresolved |  | TRO |  | 
	
		| Isoetes muricata Durieu | Synonym |  | TRO |  | 
	
		| Isoetes muricata subsp. maritima (Underw.) Hultén | Synonym |  | TRO |  | 
	
		| Isoetes natalensis Baker | Synonym |  | TRO |  | 
	
		| Isoetes neoguineensis Baker | Unresolved |  | TRO |  | 
	
		| Isoetes nigritiana A. Braun | Synonym |  | TRO |  | 
	
		| Isoetes nigroreticulata Verdc. | Unresolved |  | TRO |  | 
	
		| Isoetes novo-granadensis H.P. Fuchs | Accepted |  | TRO |  | 
	
		| Isoetes nuda Engelm. | Synonym |  | TRO |  | 
	
		| Isoetes nuttallii A. Braun ex Engelm. | Accepted |  | TRO |  | 
	
		| Isoetes nuttallii var. orcuttii (A.A. Eaton) Clute | Synonym |  | TRO |  | 
	
		| Isoetes occidentalis L.F. Hend. | Accepted |  | TRO |  | 
	
		| Isoetes olympica A. Braun | Unresolved |  | TRO |  | 
	
		| Isoetes opaca Nutt. | Synonym |  | TRO |  | 
	
		| Isoetes orcuttii A.A. Eaton | Accepted |  | TRO |  | 
	
		| Isoetes orientalis Hong Liu & Wang Q.F. | Accepted |  | TRO |  | 
	
		| Isoetes ovata N. Pfeiff. | Accepted |  | TRO |  | 
	
		| Isoetes pacifica Svenson | Synonym |  | TRO |  | 
	
		| Isoetes pallida Hickey | Accepted |  | TRO |  | 
	
		| Isoetes palmeri H.P. Fuchs | Accepted |  | TRO |  | 
	
		| Isoetes panamensis Maxon & C.V. Morton | Accepted |  | TRO |  | 
	
		| Isoetes panchananii Pant & Srivast. | Unresolved |  | TRO |  | 
	
		| Isoetes pantii H.K.Goswami & B.S.Arya | Unresolved |  | TRO |  | 
	
		| Isoetes parvula Hickey | Accepted |  | TRO |  | 
	
		| Isoetes paupercula (Engelm.) A.A. Eaton | Synonym |  | TRO |  | 
	
		| Isoetes pedersenii H.P. Fuchs ex Hickey | Unresolved |  | TRO |  | 
	
		| Isoetes perralderiana Dur. & LeTourn. | Synonym |  | TRO |  | 
	
		| Isoetes perrieriana Iversen | Accepted |  | TRO |  | 
	
		| Isoetes peruviana U. Weber | Synonym |  | TRO |  | 
	
		| Isoetes petropolitana Gand. | Synonym |  | TRO |  | 
	
		| Isoetes philippinensis Merr. & R.H. Perry | Unresolved |  | TRO |  | 
	
		| Isoetes piedmontana (N. Pfeiff.) C.F. Reed | Synonym |  | TRO |  | 
	
		| Isoetes piperi A.A. Eaton | Synonym |  | TRO |  | 
	
		| Isoetes precocia R.L. Small & Hickey | Accepted |  | TRO |  | 
	
		| Isoetes pringlei Underw. | Accepted |  | TRO |  | 
	
		| Isoetes prototypus D.M. Britton | Accepted |  | TRO |  | 
	
		| Isoetes pseudojaponica M.Takamiya, Mits.Watan. & K.Ono | Unresolved |  | TRO |  | 
	
		| Isoetes pseudotruncata Britton & D.F. Brunt. | Unresolved |  | TRO |  | 
	
		| Isoetes pygmaea Engelm. | Synonym |  | TRO |  | 
	
		| Isoetes rajasthanensis Gena & Bhardwaja | Unresolved |  | TRO |  | 
	
		| Isoetes ramboi Herter | Accepted |  | TRO |  | 
	
		| Isoetes reticulata Gena & Bhardwaja | Unresolved |  | TRO |  | 
	
		| Isoetes rhodesiana Alston | Synonym |  | TRO |  | 
	
		| Isoetes rimbachii H.P. Fuchs | Synonym |  | TRO |  | 
	
		| Isoetes riparia Engelm. ex A. Braun | Accepted |  | TRO |  | 
	
		| Isoetes riparia var. riparia | Synonym |  | TRO |  | 
	
		| Isoetes rossica Gand. | Synonym |  | TRO |  | 
	
		| Isoetes saccharata Engelm. | Synonym |  | TRO |  | 
	
		| Isoetes sampathkumarinii L.N. Rao | Unresolved |  | TRO |  | 
	
		| Isoetes saracochensis Hickey | Accepted |  | TRO |  | 
	
		| Isoetes savannarum L.D. Gómez | Synonym |  | TRO |  | 
	
		| Isoetes savatieri Franch. | Accepted |  | TRO |  | 
	
		| Isoetes schweinfurthii Baker | Accepted |  | TRO |  | 
	
		| Isoetes setacea Lam. | Accepted |  | TRO |  | 
	
		| Isoetes setacea subsp. asiatica Holub | Synonym |  | TRO |  | 
	
		| Isoetes setacea subsp. maritima Holub | Synonym |  | TRO |  | 
	
		| Isoetes sinensis Palmer | Accepted |  | TRO |  | 
	
		| Isoetes smithii H.P. Fuchs | Accepted |  | TRO |  | 
	
		| Isoetes socia A. Br. | Synonym |  | TRO |  | 
	
		| Isoetes stellenbossiensis A.V. Duthie | Accepted |  | TRO |  | 
	
		| Isoetes stephansenii A.V. Duthie | Synonym |  | TRO |  | 
	
		| Isoetes stevensii J.R. Croft | Unresolved |  | TRO |  | 
	
		| Isoetes storkii T.C. Palmer | Accepted |  | TRO |  | 
	
		| Isoetes subinermis Cesca | Unresolved |  | TRO |  | 
	
		| Isoetes suksdorfii Baker | Synonym |  | TRO |  | 
	
		| Isoetes taiwanensis De Vol | Accepted |  | TRO |  | 
	
		| Isoetes tegetiformans Rury | Accepted |  | TRO |  | 
	
		| Isoetes tenella Léman ex Desv. | Synonym |  | TRO |  | 
	
		| Isoetes tennesseensis Luebke & Budke | Unresolved |  | TRO |  | 
	
		| Isoetes texana Singhurst, Rushing & W.C. Holmes | Unresolved |  | TRO |  | 
	
		| Isoetes toximontana Musselman & J.P. Roux | Unresolved |  | TRO |  | 
	
		| Isoetes transvaalensis Jermy & Schelpe | Accepted |  | TRO |  | 
	
		| Isoetes triangula U. Weber | Accepted |  | TRO |  | 
	
		| Isoetes triquetra A. Braun | Synonym |  | TRO |  | 
	
		| Isoetes truncata (A.A. Eaton) Clute | Accepted |  | TRO |  | 
	
		| Isoetes tryoniana L.D. Gómez | Synonym |  | TRO |  | 
	
		| Isoetes tuberculata Gena & Bhardwaja | Unresolved |  | TRO |  | 
	
		| Isoetes tuckermanii A. Braun ex Engelm. | Accepted |  | TRO |  | 
	
		| Isoetes tuerckheimii Brause | Unresolved |  | TRO |  | 
	
		| Isoetes udupiensis P.K. Shukla, G.K. Srivast., S.K. Shukla & P.K. Rajagopal | Unresolved |  | TRO |  | 
	
		| Isoetes underwoodii L.F. Hend. | Synonym |  | TRO |  | 
	
		| Isoetes valida (Engelm.) Clute | Synonym |  | TRO |  | 
	
		| Isoetes velata A. Braun | Unresolved |  | TRO |  | 
	
		| Isoetes velata f. longissima (Bory & Dur.) N. Pfeiff. | Unresolved |  | TRO |  | 
	
		| Isoetes velata var. perralderiana (Dur. & LeTourn.) N. Pfeiff. | Unresolved |  | TRO |  | 
	
		| Isoetes vermiculata Hickey | Accepted |  | TRO |  | 
	
		| Isoetes virginica N. Pfeiff. | Accepted |  | TRO |  | 
	
		| Isoetes virginica var. piedmontana N. Pfeiff. | Synonym |  | TRO |  | 
	
		| Isoetes weberi Herter | Unresolved |  | TRO |  | 
	
		| Isoetes welwitschii A. Braun ex Kuhn | Accepted |  | TRO |  | 
	
		| Isoetes wormaldii R. Sim | Accepted |  | TRO |  | 
	
		| Isoetes yunguiensis Wang Q.F. & W.C. Taylor | Accepted |  | TRO |  |