| Isoetaceae | |
Isoetes abyssinica
| Chiov. | Atti Soc. Naturalisti Mat. Modena 64: 45, 1 | 1933 |
| Isoetaceae | |
Isoetes acadiensis
| Kott | Canad. J. Bot. 59: 2592–2594 | 1981 |
| Isoetaceae | |
Isoetes adspersa
| A. Braun | Expl. Sci. Algérie pl. 37, f. 3 | 1846 |
| Isoetaceae | |
Isoetes aemulans
| J.P. Roux | Lycopods Ferns Drakensberg Lesotho 92–93 | 2016 |
| Isoetaceae | |
Isoetes aequinoctialis
| A. Braun | Filic. Afr. 195 | 1868 |
| Isoetaceae | |
Isoetes afloramientorum
| D.F. Brunt. & J.B.S. Pereira | Phytotaxa 451(3): 215–222 | 2020 |
| Isoetaceae | |
Isoetes alata
| Small | Ferns Florida 22 | 1932 |
| Isoetaceae | |
Isoetes alcalophila
| Halloy | Lilloa 35(2): 68 | 1980 |
| Isoetaceae | |
Isoetes alpina
| Kirk | Trans. & Proc. New Zealand Inst. 7: 377, t. 25 | 1875 |
| Isoetaceae | |
Isoetes alstonii
| C.F. Reed & Verdc. | Kirkia 5: 19, t. | 1965 |
| Isoetaceae | |
Isoetes altonharvillii
| Musselman & R.D. Bray | | |
| Isoetaceae | |
Isoetes × altonharvillii
| Musselman & R.D. Bray | Castanea 60(3): 246–254, f. 2, 8–10 | 1995 |
| Isoetaceae | |
Isoetes amazonica
| A. Braun ex Kuhn | Fl. Bras. 1(2): 647, pl. 79, f. 5–6 | 1884 |
| Isoetaceae | |
Isoetes amazonica
| A. Braun | J. Bot. 18: 109 | 1880 |
| Isoetaceae | |
Isoetes andicola
| (Amstutz) L.D. Gómez | Brenesia 18: 4 | 1980 |
| Isoetaceae | |
Isoetes andina
| Spruce ex Hook. | Brit. Ferns ad t. 55 | 1861 |
| Isoetaceae | |
Isoetes appalachiana
| D.F. Brunt. & D.M. Britton | Rhodora 99(898): 129, f. 1, 2, 3a–3d | 1997 |
| Isoetaceae | |
Isoetes araucaniana
| Macluf & Hickey | Amer. Fern J. 97(4): 220–224, f. 1–10 | 2007 [2008] |
| Isoetaceae | |
Isoetes asiatica
| Makino | Bot. Mag. (Tokyo) 28: 184 | 1914 |
| Isoetaceae | |
Isoetes australis
| R.O. Williams | | |
| Isoetaceae | |
Isoetes azorica
| Durieu ex Milde | Fil. Eur. Atlan. 278 | 1867 |
| Isoetaceae | |
Isoetes baculata
| Hickey & H.P. Fuchs | Syst. Bot. 11(2): 310, f. 1 | 1986 |
| Isoetaceae | |
Isoetes beringensis
| Kom. | | |
| Isoetaceae | |
Isoetes biafrana
| Alston | | |
| Isoetaceae | |
Isoetes bilaspurensis
| Panigrahi | Biol. Mem. 6(2): 135 | 1981 |
| Isoetaceae | |
Isoetes bischlerae
| H.P. Fuchs | Proc. Kon. Ned. Akad. Wetensch., C 85(1): 113 | 1982 |
| Isoetaceae | |
Isoetes × blondeaui
| D.F. Brunt. & P. Sokoloff | Bot. (Ottawa) 98(10): 558 | 2020 |
| Isoetaceae | |
Isoetes bolanderi
| Engelm. | Amer. Naturalist 8(4): 214 | 1874 |
| Isoetaceae | |
Isoetes boliviensis
| U. Weber | Hedwigia 63: 247 | 1922 |
| Isoetaceae | |
Isoetes boomii
| Luebke | Amer. Fern J. 82(1): 23–24, f. 1–2 | 1992 |
| Isoetaceae | |
Isoetes boryana
| Durieu | Bull. Soc. Bot. France 8: 164 | 1861 |
| Isoetaceae | |
Isoetes boyacensis
| H.P. Fuchs | Proc. Kon. Ned. Akad. Wetensch., C 85(1): 107 | 1982 |
| Isoetaceae | |
Isoetes brachyglossa
| A. Braun | Verh. Bot. Vereins Prov. Brandenburg 4: 327 | 1862 |
| Isoetaceae | |
Isoetes bradei
| Herter | Revista Sudamer. Bot. 8: 19 | 1949 |
| Isoetaceae | |
Isoetes brasiliensis
| H.P. Fuchs | Fl. Il. Catarin. 1: 27 | 1986 |
| Isoetaceae | |
Isoetes braunii
| Unger | Gen. Sp. Pl. Foss. 597 | 1850 |
| Isoetaceae | * |
Isoetes braunii
| Durieu | Bull. Soc. Bot. France 11: 101 | 1864 |
| Isoetaceae | * |
Isoetes braunii
| Hultén | | |
| Isoetaceae | |
Isoetes brittonii
| D.F. Brunt. & W.C. Taylor | Amer. Fern J. 80: 82–89 | 1990 |
| Isoetaceae | |
Isoetes brochoni
| Motelay | Actes Soc. Linn. Bordeaux 45: 45–48 | 1893 |
| Isoetaceae | |
Isoetes bruntonii
| D. A. Knepper & Musselman | | |
| Isoetaceae | |
Isoetes butleri
| Engelm. | Bot. Gaz. 3(1): 1 | 1878 |
| Isoetaceae | |
Isoetes californica
| Engelm. | Manual (ed. 5) 677 | 1867 |
| Isoetaceae | |
Isoetes canadensis
| (Engelm.) A.A. Eaton | Proc. U.S. Natl. Mus. 23(1226): 650 | 1901 |
| Isoetaceae | |
Isoetes cangae
| J.B.S. Pereira, Salino & Stützel | Phytotaxa 272(2): 145, Figs. 2E–H, 4 | 2016 |
| Isoetaceae | |
Isoetes caparaoensis
| J.B.S. Pereira | Bot. J. Linn. Soc. 189(1): 15 | 2018 |
| Isoetaceae | |
Isoetes capensis
| | | |
| Isoetaceae | |
Isoetes capillacea
| Bory | Compt. Rend. Hebd. Séances Acad. Sci. 23: 620 | 1846 |
| Isoetaceae | |
Isoetes carltaylori
| Musselman | | |
| Isoetaceae | |
Isoetes caroliniana
| (A.A. Eaton) Luebke | Amer. Fern J. 82(1): 26 | 1992 |
| Isoetaceae | |
Isoetes chapmanii
| (Engelm.) Small | Ferns Florida 22 | 1932 |
| Isoetaceae | |
Isoetes chubutiana
| Hickey, Macluf & W.C. Taylor | Amer. Fern J. 93(3): 130 | 2003 |
| Isoetaceae | |
Isoetes cipoensis
| J.B.S. Pereira | Syst. Bot. 47(2): 301, f. 1 A-B, 2, 3, 4 A-B | 2022 |
| Isoetaceae | |
Isoetes cleefii
| H.P. Fuchs | Proc. Kon. Ned. Akad. Wetensch., C 84(2): 177–181 | 1981 |
| Isoetaceae | |
Isoetes colombiana
| (T.C. Palmer) H.P. Fuchs | Proc. Kon. Ned. Akad. Wetensch., C 85(2): 259 | 1982 |
| Isoetaceae | |
Isoetes coromandeliana
| L. f. | Suppl. Pl. 447 | 1781 [1782] |
| Isoetaceae | |
Isoetes cubana
| Engelm. ex Baker | J. Bot. 18: 110 | 1880 |
| Isoetaceae | |
Isoetes delalandei
| J. Lloyd | Fl. Ouest France 28–30 | 1852 |
| Isoetaceae | |
Isoetes delilei
| Rothm. | Feddes Repert. Spec. Nov. Regni Veg. 54: 72 | 1944 |
| Isoetaceae | |
Isoetes dichotoma
| L.E. Mora & W. Hagemann | Mutisia 43: 5 | 1977 |
| Isoetaceae | |
Isoetes dispora
| Hickey | Fieldiana, Bot. 34: 93, f. 10f, p. 90 | 1994 |
| Isoetaceae | |
Isoetes divyadarshanii
| P.K. Shukla, G.K. Srivast. & S.K. Shukla | Taxon 54(1): 113–114, f. 3, 4B,D,F, 5B,D | 2005 |
| Isoetaceae | |
Isoetes dixitii
| Shende | J. Univ. Bombay 14: 50 | 1945 |
| Isoetaceae | |
Isoetes dodgei
| A.A. Eaton | Fern Bull. 6: 6 | 1898 |
| Isoetaceae | |
Isoetes drummondii
| A. Braun | | |
| Isoetaceae | |
Isoetes dubsii
| J.B.S. Pereira | PhytoKeys 131: 59, f. 1, 2, 3 (map) | 2019 |
| Isoetaceae | ** |
Isoetes duriei
| Bory | | |
| Isoetaceae | ! |
Isoetes durieui
| Bory | Compt. Rend. Hebd. Séances Acad. Sci. 18: 1166–1167 | 1846 |
| Isoetaceae | |
Isoetes eatonii
| R. Dodge | Bot. Gaz. 23(1): 36, pl. 4–5 | 1897 |
| Isoetaceae | |
Isoetes × eatonii
| R. Dodge | Bot. Gaz. 23(1): 36, pl. 4–5 | 1897 |
| Isoetaceae | |
Isoetes echinospora
| Durieu | Bull. Soc. Bot. France 8: 164 | 1861 |
| Isoetaceae | |
Isoetes echtuckeri
| D.F. Brunt. & D.M. Britton | | |
| Isoetaceae | |
Isoetes ecuadoriensis
| Aspl. | Bot. Not. 1925: 357, f. | 1925 |
| Isoetaceae | |
Isoetes ekmanii
| U. Weber | Hedwigia 63: 251, f. 26,27 | 1922 |
| Isoetaceae | |
Isoetes elatior
| A. Braun | Linnaea 25: | 1852 [1853] |
| Isoetaceae | |
Isoetes engelmannii
| A. Braun | Flora 29: 178 | 1846 |
| Isoetaceae | |
Isoetes erongoensis
| Wanntorp | | |
| Isoetaceae | |
Isoetes escondidensis
| Halloy | Lilloa 35(2): 67 | 1980 |
| Isoetaceae | |
Isoetes eshbaughii
| Hickey | Syst. Bot. 11(2): 310, f. 2–7 | 1986 |
| Isoetaceae | |
Isoetes fairbrothersii
| J. D. Montgomery & W.C. Taylor | | |
| Isoetaceae | |
Isoetes fengii
| Y.F. Gu & Y.H. Yan | Pl. Sci. J. 41(2): 166, f. 1-3 | 2023 |
| Isoetaceae | |
Isoetes × fernaldii
| D.F. Brunt. & P. Sokoloff | J. Pl. Taxon. & Geogr. (Webbia) 75(1): 44 | 2020 |
| Isoetaceae | |
Isoetes flaccida
| Shuttlew. ex A. Braun | Flora 29(12): 178 | 1846 |
| Isoetaceae | |
Isoetes flettii
| (A.A. Eaton) N. Pfeiff. | Ann. Missouri Bot. Gard. 9(2): 186 | 1922 |
| Isoetaceae | |
Isoetes foveolata
| A.A. Eaton | Ferns Fern Allies New England 38 | 1896 |
| Isoetaceae | |
Isoetes fuliginosa
| R.L. Small & Hickey | Amer. Fern J. 91(2): 55 | 2001 |
| Isoetaceae | |
Isoetes fuscomarginata
| H.P. Fuchs | Fl. Il. Catarin. 1: 12 | 1986 |
| Isoetaceae | |
Isoetes gardneriana
| Kunze ex Mett. | Fil. Lechl. 2: 36 | 1859 |
| Isoetaceae | * |
Isoetes gardneriana
| A. Br. | Verh. Bot. Vereins Prov. Brandenburg 4: 330 | 1862 |
| Isoetaceae | |
Isoetes georgiana
| Luebke | Amer. Fern J. 82(1): 24–26, f. 3–4 | 1992 |
| Isoetaceae | |
Isoetes giessii
| Launert | | |
| Isoetaceae | |
Isoetes gigantea
| U. Weber | Nova Hedwigia 63: 245 | 1922 |
| Isoetaceae | |
Isoetes glacialis
| Aspl. | Ark. Bot. 20A(7): 35, f. 7 | 1926 |
| Isoetaceae | |
Isoetes goebelii
| U. Weber | Hedwigia 63: 247, f. 16 | 1922 |
| Isoetaceae | |
Isoetes graniticola
| D.F. Brunt. | Rhodora 118(975): 269 | 2016 |
| Isoetaceae | |
Isoetes gravesii
| A.A. Eaton | Fernwort Papers 14 | 1900 |
| Isoetaceae | |
Isoetes gunnii
| A. Braun | Monatsber. Königl. Preuss. Akad. Wiss. Berlin 535 | 1868 |
| Isoetaceae | |
Isoetes habbemensis
| Alston | J. Arnold Arbor. 26(2): 180 | 1945 |
| Isoetaceae | |
Isoetes harveyi
| A.A. Eaton | Fernwort Papers 11 | 1900 |
| Isoetaceae | |
Isoetes × harveyi
| A.A. Eaton | | |