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Organism
  Plantae
      Tracheophyta
            Lycopodiopsida
                    Isoetales
                            Isoetaceae
                                     Isoetes
                                             Isoetes altonharvillii
                                             Isoetes appalachiana
                                                   [Isoetes engelmannii f. georgiana]
                                                   [Isoetes engelmannii var. georgiana]
                                             Isoetes asiatica
                                                   [Isoetes echinospora subsp. asiatica]
                                                   [Isoetes echinospora var. asiatica]
                                             Isoetes bolanderi
                                                   [Isoetes bolanderi f. pygmaea]
                                                   [Isoetes bolanderi var. pygmaea]
                                                   [Isoetes pygmaea]
                                             Isoetes boomii
                                             Isoetes brittonii
                                             Isoetes bruntonii
                                             Isoetes butleri
                                             Isoetes carltaylorii
                                                   [Isoetes carltaylori]
                                             Isoetes caroliniana
                                                   [Isoetes engelmannii var. caroliniana]
                                             Isoetes dodgei
                                                   [Isoetes canadensis]
                                                   [Isoetes riparia f. canadensis]
                                                   [Isoetes riparia var. canadensis]
                                             Isoetes eatonii
                                                   [Isoetes eatonii var. gravesii]
                                                   [Isoetes gravesii]
                                             Isoetes echinospora
                                                   [Isoetes braunii]
                                                   [Isoetes echinospora f. robusta]
                                                   [Isoetes echinospora subsp. muricata]
                                                   [Isoetes echinospora var. braunii]
                                                   [Isoetes echinospora var. hesperia]
                                                   [Isoetes echinospora var. muricata]
                                                   [Isoetes echinospora var. robusta]
                                                   [Isoetes muricata var. braunii]
                                                   [Isoetes muricata var. hesperia]
                                                   [Isoetes muricata]
                                                   [Isoetes setacea subsp. muricata]
                                             Isoetes echtuckeri
                                             Isoetes engelmannii
                                                   [Isoetes engelmannii var. gracilis]
                                             Isoetes fairbrothersii
                                             Isoetes flaccida
                                                   [Isoetes flaccida var. alata]
                                               Isoetes flaccida var. chapmanii
                                               Isoetes flaccida var. flaccida
                                             Isoetes foveolata
                                             Isoetes georgiana
                                             Isoetes harveyi
                                                   [Isoetes tuckermanii var. harveyi]
                                             Isoetes hawaiiensis
                                             Isoetes herb-wagneri
                                             Isoetes heterospora
                                                   [Isoetes tuckermanii var. heterospora]
                                             Isoetes hickeyi
                                             Isoetes histrix
                                                   [Isoetes setacea]
                                             Isoetes howellii
                                             Isoetes hyemalis
                                             Isoetes junciformis
                                             Isoetes lacustris
                                                   [Isoetes hieroglyphica]
                                                   [Isoetes macrospora]
                                                   [Isoetes tenella]
                                             Isoetes lithophila
                                             Isoetes louisianensis
                                             Isoetes maritima
                                                   [Isoetes echinospora f. maritima]
                                                   [Isoetes echinospora subsp. maritima]
                                                   [Isoetes echinospora var. maritima]
                                                   [Isoetes echinospora var. savilei]
                                                   [Isoetes muricata subsp. maritima]
                                             Isoetes mattaponica
                                             Isoetes melanopoda
                                             Isoetes melanospora
                                             Isoetes microvela
                                             Isoetes minima
                                                   [Isoetes howellii var. minima]
                                             Isoetes novae-angliae
                                                   [Isoetes riparia var. robbinsii]
                                             Isoetes nuttallii
                                             Isoetes occidentalis
                                                   [Isoetes flettii]
                                                   [Isoetes lacustris subsp. paupercula]
                                                   [Isoetes lacustris var. paupercula]
                                                   [Isoetes paupercula]
                                                   [Isoetes piperi]
                                             Isoetes orcuttii
                                                   [Isoetes nuttallii var. orcuttii]
                                             Isoetes prototypus
                                             Isoetes pseudotruncata
                                             Isoetes riparia
                                                   [Isoetes riparia var. amesii]
                                                   [Isoetes riparia var. palmeri]
                                                   [Isoetes riparia var. reticulata]
                                                   [Isoetes saccharata var. amesii]
                                               Isoetes riparia var. riparia
                                                     [Isoetes canadensis]
                                                     [Isoetes riparia var. canadensis]
                                                     [Isoetes riparia var. palmeri]
                                                     [Isoetes riparia var. robbinsii]
                                             Isoetes saccharata
                                                   [Calamaria saccharata]
                                             Isoetes tegetiformans
                                             Isoetes tennesseensis
                                             Isoetes texana
                                             Isoetes truncata
                                             Isoetes tuckermanii
                                                   [Isoetes acadiensis]
                                             Isoetes valida
                                                   [Isoetes engelmannii var. caroliniana]
                                                   [Isoetes engelmannii var. valida]
                                             Isoetes virginica
                                                   [Isoetes piedmontana]
                                                   [Isoetes virginica var. piedmontana]