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  Plantae

      Charophyta

        Streptophytina

            Equisetopsida

              Lycopodiidae

                    Isoetales

                            Isoetaceae

                                     Calamaria

                                     Isoetes

                                             Isoetes acadiensis

                                             Isoetes altonharvillii

                                             Isoetes andicola

                                             Isoetes appalachiana

                                             Isoetes bolanderi

                                                   [Isoetes bolanderi var. parryi]

                                                   [Isoetes pygmaea]

                                               Isoetes bolanderi var. pygmaea

                                             Isoetes boomii

                                             Isoetes brittonii

                                             Isoetes bruntonii

                                             Isoetes butleri

                                                   [Isoetes butleri var. immaculata]

                                             Isoetes dodgei

                                             Isoetes eatonii

                                                   [Isoetes gravesii]

                                               Isoetes eatonii var. gravesii

                                             Isoetes echtuckeri

                                             Isoetes engelmannii

                                               Isoetes engelmannii var. caroliniana

                                               Isoetes engelmannii var. georgiana

                                               Isoetes engelmannii var. gracilis

                                               Isoetes engelmannii var. valida

                                             Isoetes fairbrothersii

                                             Isoetes flaccida

                                               Isoetes flaccida var. alata

                                               Isoetes flaccida var. chapmanii

                                               Isoetes flaccida var. flaccida

                                             Isoetes foveolata

                                             Isoetes georgiana

                                             Isoetes harveyi

                                             Isoetes heterospora

                                             Isoetes hickeyi

                                             Isoetes howellii

                                                   [Isoetes nuda]

                                               Isoetes howellii var. minima

                                             Isoetes hyemalis

                                             Isoetes junciformis

                                             Isoetes karstenii

                                                   [Isoetes lechleri var. colombiana]

                                             Isoetes lacustris

                                                   [Isoetes hieroglyphica]

                                               Isoetes lacustris var. paupercula

                                             Isoetes lithophila

                                             Isoetes louisianensis

                                             Isoetes macrospora

                                             Isoetes malinverniana

                                             Isoetes maritima

                                                   [Isoetes echinospora ssp. maritima]

                                                   [Isoetes echinospora var. maritima]

                                                   [Isoetes muricata ssp. maritima]

                                             Isoetes mattaponica

                                             Isoetes melanopoda

                                             Isoetes melanospora

                                             Isoetes microvela

                                             Isoetes minima

                                             Isoetes montezumae

                                             Isoetes nuttallii

                                                   [Isoetes opaca]

                                                   [Isoetes suksdorfii]

                                               Isoetes nuttallii var. orcuttii

                                             Isoetes occidentalis

                                                   [Isoetes flettii]

                                                   [Isoetes lacustris ssp. paupercula]

                                                   [Isoetes paupercula]

                                                   [Isoetes piperi]

                                             Isoetes orcuttii

                                             Isoetes piedmontana

                                             Isoetes pringlei

                                             Isoetes prototypus

                                             Isoetes riparia

                                               Isoetes riparia var. canadensis

                                               Isoetes riparia var. palmeri

                                               Isoetes riparia var. reticulata

                                               Isoetes riparia var. robbinsii

                                               Isoetes riparia var. amesii

                                               Isoetes riparia var. riparia

                                                     [Isoetes canadensis]

                                             Isoetes saccharata

                                                   [Calamaria saccharata]

                                               Isoetes saccharata var. amesii

                                             Isoetes tegetiformans

                                             Isoetes tenella

                                                   [Isoetes braunii]

                                                   [Isoetes echinospora ssp. asiatica]

                                                   [Isoetes echinospora ssp. muricata]

                                                   [Isoetes echinospora var. asiatica]

                                                   [Isoetes echinospora var. braunii]

                                                   [Isoetes echinospora var. hesperia]

                                                   [Isoetes echinospora var. muricata]

                                                   [Isoetes echinospora var. robusta]

                                                   [Isoetes echinospora var. savilei]

                                                   [Isoetes echinospora]

                                                   [Isoetes muricata var. braunii]

                                                   [Isoetes muricata var. hesperia]

                                                   [Isoetes muricata]

                                                   [Isoetes setacea ssp. muricata]

                                                   [Isoetes setacea]

                                             Isoetes tuckermanii

                                               Isoetes tuckermanii var. borealis

                                               Isoetes tuckermanii var. harveyi

                                               Isoetes tuckermanii var. heterospora

                                             Isoetes valida

                                                   [Isoetes caroliniana]

                                             Isoetes virginica

                                               Isoetes virginica var. piedmontana

                                             Isoetes ×

                                             Isoetes ×eatonii

                                             Isoetes ×truncata