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  Plantae
      Charophyta
        Streptophytina
            Equisetopsida
              Magnoliidae
                    Commelinales
                            Pontederiaceae
                                     Eichhornia
                                             Eichhornia azurea
                                             Eichhornia crassipes
                                                   [Eichhornia speciosa]
                                                   [Piaropus crassipes]
                                             Eichhornia paniculata
                                                   [Piaropus paniculatus]
                                     Eurystemon
                                     Heteranthera
                                           [Leptanthus]
                                             Heteranthera dubia
                                                   [Heteranthera graminea]
                                                   [Heteranthera liebmannii]
                                                   [Leptanthus gramineus]
                                                   [Zosterella dubia]
                                                   [Zosterella longituba]
                                             Heteranthera limosa
                                                   [Pontederia limosa]
                                             Heteranthera mexicana
                                                   [Eurystemon mexicanus]
                                             Heteranthera multiflora
                                             Heteranthera peduncularis
                                             Heteranthera reniformis
                                               Heteranthera reniformis var. multiflora
                                             Heteranthera rotundifolia
                                     Monochoria
                                             Monochoria vaginalis
                                                   [Pontederia vaginalis]
                                               Monochoria vaginalis var. pauciflora
                                     Piaropus
                                     Pontederia
                                             Pontederia cordata
                                                   [Pontederia lanceolata]
                                                   Pontederia cordata f. taenia
                                               Pontederia cordata var. angustifolia
                                               Pontederia cordata var. lanceolata
                                               Pontederia cordata var. lancifolia
                                             Pontederia cordifolia
                                     Schollera
                                             Schollera graminea
                                     Zosterella
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