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  Plantae
    Viridiplantae
     Streptophyta
     Embryophyta
      Tracheophyta
        Spermatophytina
            Magnoliopsida
                  Lilianae
                         [Monocotyledoneae]
                    Commelinales
                           [Haemodorales]
                           [Hanguanales]
                           [Philydrales]
                           [Pontederiales]
                            Pontederiaceae
                                   [Heterantheraceae]
                                   [Unisemataceae]
                                     Eichhornia
                                           [Piaropus]
                                             Eichhornia azurea
                                             Eichhornia crassipes
                                                   [Eichhornia speciosa]
                                                   [Piaropus crassipes]
                                             Eichhornia diversifolia
                                                   [Piaropus diversifolius]
                                             Eichhornia paniculata
                                                   [Piaropus paniculatus]
                                     Heteranthera
                                           [Eurystemon]
                                           [Zosterella]
                                             Heteranthera dubia
                                                   [Heteranthera graminea]
                                                   [Heteranthera liebmannii]
                                                   [Zosterella dubia]
                                                   [Zosterella longituba]
                                             Heteranthera limosa
                                                   [Pontederia limosa]
                                             Heteranthera mexicana
                                                   [Eurystemon mexicanum]
                                                   [Eurystemon mexicanus]
                                             Heteranthera multiflora
                                                   [Heteranthera reniformis var. multiflora]
                                             Heteranthera peduncularis
                                             Heteranthera reniformis
                                             Heteranthera rotundifolia
                                     Monochoria
                                             Monochoria hastata
                                             Monochoria vaginalis
                                                   [Monochoria vaginalis var. pauciflora]
                                                   [Pontederia vaginalis]
                                     Pontederia
                                           [Reussia]
                                             Pontederia cordata
                                                   [Pontederia cordata var. angustifolia]
                                                   [Pontederia cordata var. cordata]
                                                   [Pontederia cordata var. lanceolata]
                                                   [Pontederia cordata var. lancifolia]
                                                   [Pontederia lanceolata]
                                             Pontederia rotundifolia
                                                   [Reussia rotundifolia]