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  Plantae
      Magnoliophyta
             [Angiospermae]
         Monocots
               Commelinids
                    Commelinales
                            Pontederiaceae
                                     Eichhornia
                                             Eichhornia azurea
                                             Eichhornia crassipes
                                             Eichhornia diversifolia
                                             Eichhornia heterosperma
                                             Eichhornia meyeri
                                             Eichhornia paniculata
                                                   [Eichhornia martiusiana]
                                             Eichhornia paradoxa
                                     Eurystemon
                                     Heteranthera
                                             Heteranthera dubia
                                                   [Heteranthera liebmannii]
                                             Heteranthera limosa
                                             Heteranthera mexicana
                                             Heteranthera multiflora
                                             Heteranthera oblongifolia
                                             Heteranthera peduncularis
                                             Heteranthera reniformis
                                               Heteranthera reniformis var. multiflora
                                             Heteranthera rotundifolia
                                             Heteranthera seubertiana
                                                   [Eichhornia graminea]
                                             Heteranthera spicata
                                             Heteranthera zosterifolia
                                     Hydrothrix
                                             Hydrothrix gardneri
                                     Monochoria
                                     Piaropus
                                     Pontederia
                                             Pontederia cordata
                                                   [Pontederia cordata var. lancifolia]
                                                   [Pontederia cordata var. ovalis]
                                                   [Pontederia lanceolata]
                                                   [Pontederia ovalis]
                                               Pontederia cordata var. cordata
                                             Pontederia parviflora
                                                   [Pontederia cordata var. parviflora]
                                             Pontederia rotundifolia
                                                   [Pontederia cordifolia]
                                             Pontederia sagittata
                                             Pontederia subovata
                                                   [Pontederia lagoensis]
                                             Pontederia triflora
                                     Reussia
                                     Zosterella
                                             Zosterella dubia