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Eukaryota
  Plantae
    Embryophyta
      Lycopodiophyta
            Lycopodiopsida
                    Isoetales
                            Isoetaceae
                                     Calamaria
                                     Isoetes
                                             Isoetes abyssinica
                                             Isoetes aemulans
                                             Isoetes aequinoctialis
                                                   [Calamaria aequinoctialis]
                                                   [Isoetes erongoensis]
                                             Isoetes alstonii
                                             Isoetes capensis
                                             Isoetes eludens
                                             Isoetes giessii
                                             Isoetes labri-draconis
                                             Isoetes schweinfurthii
                                                   [Calamaria schweinfurthii]
                                                   [Isoetes kersii]
                                                   [Isoetes rhodesiana]
                                             Isoetes stellenbossiensis
                                             Isoetes stephansenii
                                                   [Isoetes capensis var. stephanseniae]
                                             Isoetes toximontana
                                             Isoetes transvaalensis
                                             Isoetes welwitschii
                                                   [Calamaria natalensis]
                                                   [Calamaria welwitschii]
                                                   [Isoetes natalensis]
                                             Isoetes wormaldii