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Organism
  Plantae
      Tracheophyta
             [Equisetophyta]
             [Pteridophyta]
        Lycopodiophytina
            Lycopodiopsida
              Isoetidae
                    Isoetales
                           [Isoeteae]
                            Isoetaceae
                                     Isoetes
                                           [Calamaria]
                                           [Cephaloceraton]
                                           [Isoetella]
                                           [Stylites]
                                           [Subularia]
                                             Isoetes abyssinica
                                             Isoetes aemulans
                                             Isoetes aequinoctialis
                                                   [Calamaria aequinoctialis]
                                                   [Isoetes erongoensis]
                                             Isoetes afloramientorum
                                             Isoetes alcalophila
                                             Isoetes alpina
                                                   [Calamaria alpina]
                                                   [Isoetes kirkii var. alpina]
                                                   [Isoetes multiangularis]
                                             Isoetes alstonii
                                             Isoetes amazonica
                                                   [Calamaria amazonica]
                                             Isoetes anatolica
                                             Isoetes andicola
                                                   [Isoetes andicola var. gemmifera]
                                                   [Stylites andicola]
                                                   [Stylites gemmifera]
                                             Isoetes andina
                                                   [Calamaria triquetra]
                                                   [Isoetes lechleri var. triquetra]
                                                   [Isoetes triquetra]
                                             Isoetes appalachiana
                                                   [Isoetes engelmannii f. fontana]
                                                   [Isoetes engelmannii f. georgiana]
                                                   [Isoetes engelmannii var. fontana]
                                                   [Isoetes engelmannii var. georgiana]
                                             Isoetes araucaniana
                                                   [Isoetes favulata]
                                             Isoetes asiatica
                                                   [Isoetes echinospora subsp. asiatica]
                                                   [Isoetes echinospora var. asiatica]
                                                   [Isoetes muricata subsp. asiatica]
                                                   [Isoetes setacea subsp. asiatica]
                                             Isoetes attenuata
                                             Isoetes australis
                                             Isoetes azorica
                                                   [Calamaria azorica]
                                             Isoetes baculata
                                             Isoetes biafrana
                                             Isoetes bischlerae
                                             Isoetes bolanderi
                                                   [Calamaria bolanderi]
                                                   [Calamaria pygmaea]
                                                   [Isoetes bolanderi f. pygmaea]
                                                   [Isoetes bolanderi var. parryi]
                                                   [Isoetes bolanderi var. pygmaea]
                                                   [Isoetes bolanderi var. sonnei]
                                                   [Isoetes californica]
                                                   [Isoetes parryi]
                                                   [Isoetes pygmaea]
                                               Isoetes bolanderi var. bolanderi
                                             Isoetes boliviensis
                                             Isoetes boomii
                                             Isoetes boryana
                                                   [Calamaria boryana]
                                                   [Isoetes boryana subsp. brevis]
                                                   [Isoetes boryana subsp. condensata]
                                                   [Isoetes boryana subsp. frigida]
                                                   [Isoetes boryana subsp. gredensis]
                                                   [Isoetes boryana subsp. legitima]
                                                   [Isoetes boryana subsp. praetervisa]
                                                   [Isoetes variabilis subsp. boryana]
                                                   [Isoetes velata var. boryana]
                                             Isoetes boyacensis
                                             Isoetes bradei
                                             Isoetes brasiliensis
                                                   [Isoetes reitzii]
                                             Isoetes brevicula
                                             Isoetes brittonii
                                             Isoetes bruntonii
                                             Isoetes butleri
                                                   [Calamaria butleri]
                                                   [Isoetes butleri f. immaculata]
                                                   [Isoetes butleri var. immaculata]
                                             Isoetes cangae
                                             Isoetes capensis
                                             Isoetes caroli
                                             Isoetes caroliniana
                                                   [Isoetes engelmannii var. caroliniana]
                                             Isoetes chubutiana
                                                   [Isoetes meyeri]
                                                   [Isoetes savatieri subsp. valdiviensis]
                                                   [Isoetes valdiviensis]
                                             Isoetes coreana
                                                   [Isoetes sinensis var. coreana]
                                             Isoetes coromandeliana
                                             Isoetes coromandelina
                                               Isoetes coromandelina subsp. coromandelina
                                                     [Calamaria coromandelina]
                                                     [Isoetes brachyglossa]
                                                     [Isoetes capsularis]
                                                     [Isoetes coromandeliana subsp. thanensis]
                                                     [Isoetes coromandelina subsp. brachyglossa]
                                                     [Isoetes coromandelina var. raipurensis]
                                                     [Isoetes debii]
                                                     [Isoetes fuchsii]
                                                     [Isoetes indica var. harotiensis]
                                                     [Isoetes indica]
                                                     [Isoetes mirzapurensis]
                                                     [Isoetes pantii]
                                                     [Isoetes semilocularis]
                                                     [Isoetes tuberculata]
                                                     [Isoetes unilocularis]
                                               Isoetes coromandelina subsp. macrotuberculata
                                             Isoetes creussensis
                                             Isoetes cristata
                                             Isoetes cubana
                                                   [Calamaria cubana]
                                             Isoetes delilei
                                                   [Isoetes palustris var. setacea]
                                                   [Isoetes setacea var. delilei]
                                             Isoetes dispora
                                             Isoetes dixitii
                                                   [Isoetes bilaspurensis]
                                             Isoetes drummondii
                                               Isoetes drummondii subsp. anomala
                                               Isoetes drummondii subsp. drummondii
                                                     [Calamaria drummondii]
                                             Isoetes duriei
                                                   [Calamaria durieui]
                                                   [Isoetella duriei]
                                                   [Isoetes duriaei subsp. balearica]
                                                   [Isoetes duriaei subsp. felix]
                                                   [Isoetes duriaei subsp. insularis]
                                                   [Isoetes duriaei subsp. kabylica]
                                                   [Isoetes duriaei subsp. leptophylla]
                                                   [Isoetes duriaei subsp. ligustica]
                                                   [Isoetes duriaei subsp. litorea]
                                                   [Isoetes duriaei subsp. lusitanica]
                                                   [Isoetes duriaei subsp. maritima]
                                                   [Isoetes duriaei subsp. sardoa]
                                                   [Isoetes ligustica]
                                                   [Isoetes tridentata]
                                             Isoetes eatonii
                                                   [Isoetes eatoni f. gravesii]
                                                   [Isoetes eatoni var. gravesii]
                                                   [Isoetes eatoni]
                                                   [Isoetes gravesii]
                                                   [Isoetes valida var. gravesii]
                                             Isoetes echinospora
                                                   [Calamaria echinospora]
                                                   [Isoetes ambigua]
                                                   [Isoetes boottii]
                                                   [Isoetes braunii f. astoma]
                                                   [Isoetes braunii f. oligostoma]
                                                   [Isoetes braunii f. polystoma]
                                                   [Isoetes braunii f. robusta]
                                                   [Isoetes braunii]
                                                   [Isoetes echinospora f. astoma]
                                                   [Isoetes echinospora f. boottii]
                                                   [Isoetes echinospora f. oligostoma]
                                                   [Isoetes echinospora f. polystoma]
                                                   [Isoetes echinospora f. robusta]
                                                   [Isoetes echinospora subsp. admixta]
                                                   [Isoetes echinospora subsp. belgica]
                                                   [Isoetes echinospora subsp. borealis]
                                                   [Isoetes echinospora subsp. centralis]
                                                   [Isoetes echinospora subsp. discedens]
                                                   [Isoetes echinospora subsp. echinospora]
                                                   [Isoetes echinospora subsp. fennica]
                                                   [Isoetes echinospora subsp. gothica]
                                                   [Isoetes echinospora subsp. montana]
                                                   [Isoetes echinospora subsp. muricata]
                                                   [Isoetes echinospora subsp. oligophylla]
                                                   [Isoetes echinospora subsp. petropolitana]
                                                   [Isoetes echinospora subsp. praebens]
                                                   [Isoetes echinospora subsp. pulchella]
                                                   [Isoetes echinospora subsp. pygmaea]
                                                   [Isoetes echinospora subsp. remissa]
                                                   [Isoetes echinospora subsp. vogesiaca]
                                                   [Isoetes echinospora var. boothii]
                                                   [Isoetes echinospora var. boottii]
                                                   [Isoetes echinospora var. braunii]
                                                   [Isoetes echinospora var. brittoni]
                                                   [Isoetes echinospora var. elatior]
                                                   [Isoetes echinospora var. hesperia]
                                                   [Isoetes echinospora var. muricata]
                                                   [Isoetes echinospora var. robusta]
                                                   [Isoetes lacustris subsp. curvifolia]
                                                   [Isoetes lacustris subsp. echinospora]
                                                   [Isoetes lacustris var. crassa]
                                                   [Isoetes lacustris var. elatior]
                                                   [Isoetes lacustris var. longifolia]
                                                   [Isoetes lacustris var. minor]
                                                   [Isoetes lacustris var. recurvata]
                                                   [Isoetes muricata f. robusta]
                                                   [Isoetes muricata var. braunii]
                                                   [Isoetes muricata var. hesperia]
                                                   [Isoetes muricata]
                                                   [Isoetes setacea subsp. monspeliensis]
                                                   [Isoetes setacea subsp. muricata]
                                                   [Isoetes setacea subsp. normalis]
                                                   [Isoetes setacea subsp. stricta]
                                                   [Isoetes setacea subsp. turgida]
                                                   [Isoetes setacea subsp. valida]
                                                   [Isoetes setacea subsp. vicina]
                                                   [Isoetes tenella f. astoma]
                                                   [Isoetes tenella f. iversenii]
                                                   [Isoetes tenella f. lativelata]
                                                   [Isoetes tenella f. oligostoma]
                                                   [Isoetes tenella f. polystoma]
                                                   [Isoetes tenella f. robusta]
                                                   [Isoetes tenella var. braunii]
                                                   [Isoetes tenella var. oligostoma]
                                               Isoetes echinospora var. echinospora
                                             Isoetes ecuadoriensis
                                                   [Isoetes keeleyorum]
                                             Isoetes ekmanii
                                             Isoetes elatior
                                                   [Calamaria elatior]
                                                   [Isoetes tasmanica]
                                             Isoetes eludens
                                             Isoetes engelmannii
                                                   [Calamaria engelmannii]
                                                   [Isoetes engelmannii var. gracilis]
                                                   [Isoetes fairbrothersii]
                                                   [Isoetes lacustris var. microspora]
                                               Isoetes engelmannii var. engelmannii
                                             Isoetes escondidensis
                                                   [Isoetes castillonii]
                                                   [Isoetes filipovichii]
                                                   [Isoetes halloyi]
                                             Isoetes eshbaughii
                                             Isoetes flaccida
                                                   [Calamaria flaccida]
                                                   [Isoetes alata]
                                                   [Isoetes flaccida f. rigida]
                                                   [Isoetes flaccida var. alata]
                                                   [Isoetes flaccida var. rigida]
                                               Isoetes flaccida var. chapmanii
                                                     [Isoetes chapmanii]
                                                     [Isoetes flaccida f. chapmanii]
                                               Isoetes flaccida var. flaccida
                                             Isoetes fluitans
                                             Isoetes foveolata
                                             Isoetes fuliginosa
                                             Isoetes fuscomarginata
                                             Isoetes gardneriana
                                                   [Calamaria gardneriana]
                                             Isoetes georgiana
                                             Isoetes giessii
                                             Isoetes gigantea
                                             Isoetes graniticola
                                             Isoetes gunnii
                                                   [Calamaria gunnii]
                                             Isoetes gymnocarpa
                                                   [Cephaloceraton gymnocarpum]
                                                   [Cephaloceraton hystrix var. subinermis]
                                                   [Isoetes histrix f. subinermis]
                                                   [Isoetes histrix var. subinermis]
                                                   [Isoetes hystrix var. subinermis]
                                                   [Isoetes sicula]
                                                   [Isoetes subinermis]
                                             Isoetes habbemensis
                                             Isoetes hallasanensis
                                             Isoetes harveyi
                                                   [Isoetes tuckermanii var. harveyi]
                                             Isoetes haussknechtii
                                             Isoetes hawaiiensis
                                             Isoetes heldreichii
                                             Isoetes hemivelata
                                             Isoetes herzogii
                                             Isoetes heterospora
                                                   [Isoetes macrospora f. heterospora]
                                                   [Isoetes macrospora var. heterospora]
                                                   [Isoetes tuckermani var. heterospora]
                                             Isoetes hewitsonii
                                             Isoetes hieronymi
                                                   [Isoetes argentina]
                                             Isoetes histrix
                                                   [Calamaria hystrix]
                                                   [Cephaloceraton hystrix]
                                                   [Cephaloceraton pseudohystrix]
                                                   [Isoetes chaeturetii]
                                                   [Isoetes delalandei]
                                                   [Isoetes duriaei]
                                                   [Isoetes histrix subsp. delalandei]
                                                   [Isoetes histrix subsp. sicula]
                                                   [Isoetes histrix var. desquamata]
                                                   [Isoetes histrix var. grandis]
                                                   [Isoetes histrix var. lacunosa]
                                                   [Isoetes histrix var. loricata]
                                                   [Isoetes histrix var. scutellata]
                                                   [Isoetes histrix var. submersa]
                                                   [Isoetes hystrix subsp. algarbiensis]
                                                   [Isoetes hystrix subsp. arcuata]
                                                   [Isoetes hystrix subsp. cesatii]
                                                   [Isoetes hystrix subsp. collina]
                                                   [Isoetes hystrix subsp. corsica]
                                                   [Isoetes hystrix subsp. hispanica]
                                                   [Isoetes hystrix subsp. horridula]
                                                   [Isoetes hystrix subsp. longiseta]
                                                   [Isoetes hystrix subsp. numidica]
                                                   [Isoetes hystrix subsp. oceanica]
                                                   [Isoetes hystrix subsp. oranensis]
                                                   [Isoetes hystrix subsp. phrygia]
                                                   [Isoetes hystrix subsp. todaroi]
                                                   [Isoetes hystrix subsp. transiens]
                                                   [Isoetes hystrix]
                                                   [Isoetes pseudohystrix]
                                             Isoetes hopei
                                             Isoetes howellii
                                                   [Isoetes melanopoda f. californica]
                                                   [Isoetes melanopoda var. californica]
                                                   [Isoetes nuda]
                                                   [Isoetes underwoodii]
                                             Isoetes humilior
                                                   [Calamaria humilior]
                                                   [Isoetes hookeri]
                                             Isoetes hyemalis
                                             Isoetes hypsophila
                                             Isoetes inflata
                                             Isoetes jaegeri
                                             Isoetes jamaicensis
                                             Isoetes japonica
                                                   [Calamaria japonica]
                                                   [Isoetes edulis]
                                             Isoetes jejuensis
                                             Isoetes junciformis
                                             Isoetes karstenii
                                                   [Isoetes colombiana]
                                                   [Isoetes lechleri var. colombiana]
                                                   [Isoetes steyermarkii]
                                               Isoetes karstenii var. anomala
                                                     [Isoetes lechleri var. anomala]
                                                     [Isoetes rimbachiana]
                                             Isoetes killipii
                                                   [Isoetes roncadorensis]
                                                   [Isoetes roraimensis]
                                             Isoetes kirkii
                                                   [Calamaria kirkii]
                                             Isoetes labri-draconis
                                             Isoetes lacustris
                                                   [Calamaria lacustris]
                                                   [Calamaria setacea]
                                                   [Isoetes atrovirens]
                                                   [Isoetes brochonii]
                                                   [Isoetes hieroglyphica]
                                                   [Isoetes lacustris subsp. abbreviata]
                                                   [Isoetes lacustris subsp. arvernensis]
                                                   [Isoetes lacustris subsp. cambrica]
                                                   [Isoetes lacustris subsp. editorum]
                                                   [Isoetes lacustris subsp. errabunda]
                                                   [Isoetes lacustris subsp. lacustris]
                                                   [Isoetes lacustris subsp. lamottei]
                                                   [Isoetes lacustris subsp. langei]
                                                   [Isoetes lacustris subsp. latifolia]
                                                   [Isoetes lacustris subsp. noltei]
                                                   [Isoetes lacustris subsp. obscura]
                                                   [Isoetes lacustris subsp. pervaga]
                                                   [Isoetes lacustris subsp. rivalis]
                                                   [Isoetes lacustris subsp. rossica]
                                                   [Isoetes lacustris subsp. scanica]
                                                   [Isoetes lacustris subsp. scotica]
                                                   [Isoetes lacustris subsp. septentrionalis]
                                                   [Isoetes lacustris subsp. spreta]
                                                   [Isoetes lacustris subsp. succedanea]
                                                   [Isoetes lacustris subsp. suecica]
                                                   [Isoetes lacustris var. curvifolia]
                                                   [Isoetes lacustris var. falcata]
                                                   [Isoetes lacustris var. humilior]
                                                   [Isoetes lacustris var. humilis]
                                                   [Isoetes lacustris var. intermedia]
                                                   [Isoetes lacustris var. leiospora]
                                                   [Isoetes lacustris var. moorei]
                                                   [Isoetes lacustris var. morei]
                                                   [Isoetes lacustris var. rectifolia]
                                                   [Isoetes lacustris var. recurva]
                                                   [Isoetes lacustris var. setacea]
                                                   [Isoetes lacustris var. stricta]
                                                   [Isoetes lacustris var. tenella]
                                                   [Isoetes lacustris var. tenuifolia]
                                                   [Isoetes lacustris var. terrestris]
                                                   [Isoetes lacustris var. vulgaris]
                                                   [Isoetes leiospora]
                                                   [Isoetes macrospora f. hieroglyphica]
                                                   [Isoetes macrospora]
                                                   [Isoetes moorei]
                                                   [Isoetes tenella]
                                                   [Isoetes tuckermani var. harveyi]
                                             Isoetes laosiensis
                                             Isoetes laurentiana
                                             Isoetes lechleri
                                                   [Calamaria lechleri]
                                                   [Isoetes arumiana]
                                                   [Isoetes glacialis]
                                                   [Isoetes laevis]
                                                   [Isoetes peruviana]
                                                   [Isoetes socia]
                                             Isoetes libanotica
                                             Isoetes lithophila
                                             Isoetes longissima
                                               Isoetes longissima subsp. adspersa
                                                     [Calamaria adspersa]
                                                     [Isoetes adspersa var. perreymondii]
                                                     [Isoetes adspersa]
                                                     [Isoetes aspersum]
                                                     [Isoetes capillacea]
                                                     [Isoetes lineolata]
                                                     [Isoetes perreymondii]
                                                     [Isoetes setacea var. perreymondii]
                                                     [Isoetes setacea]
                                                     [Isoetes velata subsp. adspersa]
                                                     [Isoetes velata var. perrymondii]
                                               Isoetes longissima subsp. asturicensis
                                                     [Isoetes asturicensis]
                                                     [Isoetes boryana subsp. asturicensis]
                                                     [Isoetes velata subsp. asturicensis]
                                                     [Isoetes velata var. asturicense]
                                               Isoetes longissima subsp. intermedia
                                                     [Isoetes velata f. immaculata]
                                                     [Isoetes velata subsp. intermedia]
                                                     [Isoetes velata var. intermedia]
                                                     [Isoetes velata]
                                                     [Isöetes velata subsp. velata]
                                               Isoetes longissima subsp. longissima
                                                     [Calamaria longissima]
                                                     [Isoetes baetica]
                                                     [Isoetes boryana var. lereschii]
                                                     [Isoetes chaboissaei]
                                                     [Isoetes decipiens]
                                                     [Isoetes dubia var. emersa]
                                                     [Isoetes dubia var. maculosa]
                                                     [Isoetes grammontii]
                                                     [Isoetes iluliana]
                                                     [Isoetes setacea subsp. longissima]
                                                     [Isoetes tenuissima var. chaboissaei]
                                                     [Isoetes tenuissima var. tenuissima]
                                                     [Isoetes tenuissima]
                                                     [Isoetes variabilis]
                                                     [Isoetes velata f. baetica]
                                                     [Isoetes velata f. lereschii]
                                                     [Isoetes velata subsp. algeriensis]
                                                     [Isoetes velata subsp. australis]
                                                     [Isoetes velata subsp. barbara]
                                                     [Isoetes velata subsp. calaostiensis]
                                                     [Isoetes velata subsp. divergens]
                                                     [Isoetes velata subsp. gallica]
                                                     [Isoetes velata subsp. longissima]
                                                     [Isoetes velata subsp. redux]
                                                     [Isoetes velata subsp. robusta]
                                                     [Isoetes velata subsp. tenuicula]
                                                     [Isoetes velata subsp. trinacria]
                                                     [Isoetes velata var. brevifolia]
                                                     [Isoetes velata var. humilior]
                                                     [Isoetes velata var. lereschii]
                                                     [Isoetes velata var. longissima]
                                                     [Isoetes velata var. sicula]
                                                     [Isoetes vellata var. boryana]
                                               Isoetes longissima subsp. perralderiana
                                                     [Calamaria perralderiana]
                                                     [Isoetes perralderiana]
                                                     [Isoetes velata subsp. perralderiana]
                                                     [Isoetes velata var. perralderiana]
                                               Isoetes longissima subsp. tenuissima
                                                     [Calamaria tenuissima]
                                                     [Isoetes tenuissima var. capillifolia]
                                                     [Isoetes tenuissima var. latifolia]
                                                     [Isoetes tenuissima var. longifolia]
                                                     [Isoetes velata subsp. tenuissima]
                                                     [Isoetes viollaei]
                                             Isoetes louisianensis
                                             Isoetes luetzelburgii
                                             Isoetes malinverniana
                                                   [Calamaria malinverniana]
                                             Isoetes maritima
                                                   [Isoetes beringensis]
                                                   [Isoetes braunii var. maritima]
                                                   [Isoetes echinospora subsp. maritima]
                                                   [Isoetes echinospora var. maritima]
                                                   [Isoetes echinospora var. savilei]
                                                   [Isoetes macounii]
                                                   [Isoetes muricata subsp. maritima]
                                                   [Isoetes setacea subsp. maritima]
                                             Isoetes martii
                                                   [Calamaria martii]
                                             Isoetes mattaponica
                                             Isoetes maxima
                                             Isoetes melanopoda
                                               Isoetes melanopoda subsp. melanopoda
                                                     [Calamaria melanopoda]
                                                     [Isoetes melanopoda f. pallida]
                                                     [Isoetes melanopoda var. pallida]
                                               Isoetes melanopoda subsp. silvatica
                                               Isoëtes melanopoda var. melanopoda
                                             Isoetes melanospora
                                                   [Calamaria melanospora]
                                             Isoetes melanotheca
                                             Isoetes mexicana
                                                   [Isoetes montezumae]
                                             Isoetes microvela
                                             Isoetes minima
                                                   [Isoetes howellii var. minima]
                                             Isoetes mississippiensis
                                             Isoetes mongerensis
                                             Isoetes mourabaptistae
                                             Isoetes muelleri
                                                   [Calamaria muelleri]
                                                   [Isoetes stuartii]
                                             Isoetes naipiana
                                             Isoetes nana
                                             Isoetes neoguineensis
                                                   [Isoetes neoguineensis var. rheophila]
                                               Isoetes neoguineensis var. neoguineensis
                                             Isoetes nigritiana
                                                   [Calamaria nigritiana]
                                                   [Isoetes garnieri]
                                             Isoetes nigroreticulata
                                             Isoetes novae-angliae
                                                   [Isoetes canadensis var. robbinsii]
                                                   [Isoetes chapmanii var. robbinsii]
                                                   [Isoetes dodgei var. robbinsii]
                                                   [Isoetes riparia var. robbinsii]
                                             Isoetes novogranadensis
                                                   [Isoetes dichotoma]
                                                   [Isoetes hagemannii]
                                                   [Isoetes leistii]
                                                   [Isoetes narinensis]
                                                   [Isoetes pichichensis]
                                                   [Isoetes quilindanensis]
                                             Isoetes nuttallii
                                                   [Calamaria nuttallii]
                                                   [Calamaria suksdorfii]
                                                   [Isoetes opaca]
                                                   [Isoetes suksdorfii]
                                               Isoetes nuttallii var. nuttallii
                                             Isoetes occidentalis
                                                   [Isoetes echinospora f. flettii]
                                                   [Isoetes echinospora subsp. flettii]
                                                   [Isoetes echinospora var. flettii]
                                                   [Isoetes flettii]
                                                   [Isoetes howellii f. piperi]
                                                   [Isoetes howellii var. piperi]
                                                   [Isoetes lacustris subsp. paupercula]
                                                   [Isoetes lacustris var. paupercula]
                                                   [Isoetes macrospora f. paupercula]
                                                   [Isoetes maritima var. flettii]
                                                   [Isoetes occidentalis subsp. paupercula]
                                                   [Isoetes occidentalis var. piperi]
                                                   [Isoetes paupercula]
                                                   [Isoetes piperi]
                                             Isoetes olympica
                                                   [Calamaria olympica]
                                             Isoetes orcuttii
                                                   [Isoetes nuttallii var. orcuttii]
                                             Isoetes organensis
                                             Isoetes orientalis
                                             Isoetes ovata
                                                   [Isoetes clavata]
                                             Isoetes pallida
                                             Isoetes palmeri
                                                   [Isoetes cleeffii]
                                             Isoetes palustris
                                             Isoetes panamensis
                                                   [Isoetes pacifica]
                                                   [Isoetes savannarum]
                                             Isoetes parvula
                                             Isoetes pedersenii
                                             Isoetes perrieriana
                                             Isoetes philippinensis
                                             Isoetes phrygia
                                                   [Isoetes histrix var. phrygia]
                                             Isoetes pitotii
                                             Isoetes precocia
                                             Isoetes pringlei
                                             Isoetes prototypus
                                             Isoetes pseudojaponica
                                             Isoetes pusilla
                                             Isoetes quiririensis
                                             Isoetes ramboi
                                             Isoetes riparia
                                                   [Calamaria riparia]
                                                   [Isoetes amesii]
                                                   [Isoetes canadensis var. amesii]
                                                   [Isoetes dodgei]
                                                   [Isoetes foveolata var. plenospora]
                                                   [Isoetes riparia f. saccharata]
                                                   [Isoetes riparia var. amesii]
                                                   [Isoetes riparia var. palmeri]
                                                   [Isoetes riparia var. reticulata]
                                                   [Isoetes riparia var. riparia]
                                                   [Isoetes saccharata f. palmeri]
                                                   [Isoetes saccharata f. reticulata]
                                                   [Isoetes saccharata var. amesii]
                                                   [Isoetes saccharata var. palmeri]
                                                   [Isoetes saccharata var. reticulata]
                                             Isoetes sabatina
                                             Isoetes saccharata
                                                   [Calamaria saccharata]
                                             Isoetes sahyadrii
                                                   [Isoetes mahadevensis]
                                                   [Isoetes panchananii var. panchmarhiensis]
                                                   [Isoetes panchananii]
                                                   [Isoetes panchganiensis var. kemangundiensis]
                                                   [Isoetes panchganiensis]
                                                   [Isoetes rajasthanensis]
                                                   [Isoetes reticulata]
                                                   [Isoetes sampathkumarnii]
                                             Isoetes santacruzensis
                                             Isoetes saracochensis
                                             Isoetes savatieri
                                                   [Calamaria savatieri]
                                                   [Isoetes chilensis]
                                                   [Isoetes lechleri var. savatieri]
                                               Isoetes savatieri subsp. savatieri
                                             Isoetes schweinfurthii
                                                   [Calamaria schweinfurthii]
                                                   [Isoetes kersii]
                                                   [Isoetes rhodesiana]
                                             Isoetes sehnemii
                                             Isoetes septentrionalis
                                             Isoetes serracarajensis
                                             Isoetes sinensis
                                             Isoetes smithii
                                             Isoetes spannagelii
                                             Isoetes spinulospora
                                             Isoetes stellenbossiensis
                                             Isoetes stephanseniae
                                                   [Isoetes capensis var. stephansenii]
                                             Isoetes stevensii
                                             Isoetes storkii
                                                   [Isoetes montana]
                                                   [Isoetes tryoniana]
                                             Isoetes taiwanensis
                                               Isoetes taiwanensis var. kinmenensis
                                             Isoetes tamaulipana
                                             Isoetes tegetiformans
                                             Isoetes tennesseensis
                                             Isoetes tenuifolia
                                             Isoetes texana
                                             Isoetes tiguliana
                                                   [Calamaria dubia]
                                                   [Calamaria tegulensis]
                                                   [Isoetes dubia]
                                                   [Isoetes tegulensis f. submersa]
                                                   [Isoetes tegulensis f. terrestris]
                                                   [Isoetes tegulensis]
                                                   [Isoetes velata subsp. dubia]
                                                   [Isoetes velata subsp. tegulensis]
                                                   [Isoetes velata var. tegulensis]
                                             Isoetes todaroana
                                                   [Isoetes iapygia]
                                             Isoetes toximontana
                                             Isoetes transvaalensis
                                             Isoetes triangula
                                                   [Isoetes schinzii]
                                             Isoetes tripus
                                                   [Calamaria tripus]
                                                   [Isoetes phaeospora]
                                             Isoetes truncata
                                                   [Isoetes echinospora var. truncata]
                                                   [Isoetes muricata subsp. truncata]
                                             Isoetes tuckermani
                                             Isoetes tuckermanii
                                                   [Calamaria tuckermanii]
                                                   [Isoetes acadiensis]
                                                   [Isoetes tuckermanii var. borealis]
                                             Isoetes tuerckheimii
                                             Isoetes udupiensis
                                                   [Isoetes divyadarshanii]
                                             Isoetes ulei
                                                   [Isoetes goebelii]
                                             Isoetes valida
                                                   [Isoetes engelmannii var. valida]
                                             Isoetes vanensis
                                             Isoetes vellata
                                             Isoetes vermiculata
                                             Isoetes virginica
                                                   [Isoetes piedmontana]
                                                   [Isoetes virginica var. piedmontana]
                                               Isoetes virginica var. virginica
                                             Isoetes viridimontana
                                             Isoetes weberi
                                             Isoetes welwitschii
                                                   [Calamaria natalensis]
                                                   [Calamaria welwitschii]
                                                   [Isoetes natalensis]
                                             Isoetes wormaldii
                                             Isoetes x altonharvillii
                                             Isoetes x brittonii
                                             Isoetes x bruntonii
                                             Isoetes x carltaylori
                                             Isoetes x dodgei
                                                   [Isoetes canadensis]
                                                   [Isoetes riparia f. canadensis]
                                                   [Isoetes riparia var. canadensis]
                                             Isoetes x eatonii
                                             Isoetes x echtuckeri
                                             Isoetes x foveolata
                                             Isoetes x gopalkrishnae
                                             Isoetes x harveyi
                                             Isoetes x herb-wagneri
                                             Isoetes x heterospora
                                             Isoetes x hickeyi
                                             Isoetes x jeffreyi
                                             Isoetes x marensis
                                             Isoetes x michinokuana
                                             Isoetes x novae-angliae
                                             Isoetes x paratunica
                                             Isoetes x pseudotruncata
                                             Isoetes x truncata
                                             Isoetes yunguiensis
                                             † Isoetes horridus
                                             † Isoetes incerta
                                             † Isoetes subengelmanni
                                             † Isoetes trullata
                                     † Echinosporis
                                     † Isoetites
                                             † Isoetites bolandii
                                             † Isoetites brandneri
                                             † Isoetites horridus
                                             † Isoetites rolandii
                                             † Isoetites serratus
                                     † Paxillitriletes
                                             † Paxillitriletes alatus
                                             † Paxillitriletes fairlightensis
                                             † Paxillitriletes kachaikense
                                             † Paxillitriletes menendezii
                                     † Peromonolites
                                             † Peromonolites allenensis
                                             † Peromonolites vellosus
                                     † Tenellisporites
                                             † Tenellisporites coronatus