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Organism
  Plantae
   Viridiplantae
     Streptophyta
     Embryophyta
      Tracheophyta
        Spermatophytina
            Magnoliopsida
                  Lilianae
                         [Liliopsida]
                    Alismatales
                            Potamogetonaceae
                                     Althenia
                                           [Lepilaena]
                                             Althenia australis
                                                   [Lepilaena australis]
                                     Coleogeton
                                     Groenlandia
                                             Groenlandia densa
                                                   [Potamogeton pauciflorus]
                                     Pelta
                                     Potamogeton
                                             Potamogeton acutifolius
                                             Potamogeton alpinus
                                                   [Potamogeton alpinus subsp. tenuifolius]
                                                   [Potamogeton alpinus var. subellipticus]
                                                   [Potamogeton alpinus var. tenuifolius]
                                             Potamogeton amplifolius
                                             Potamogeton angustifolius
                                             Potamogeton berchtoldii
                                                   [Potamogeton pusillus subsp. tenuissimus]
                                                   [Potamogeton pusillus var. berchtoldii]
                                                   [Potamogeton pusillus var. tenuissimus]
                                               Potamogeton berchtoldii subsp. berchtoldii
                                                     [Potamogeton pusillus subsp. tenuissimus]
                                                     [Potamogeton pusillus var. tenuissimus]
                                               Potamogeton berchtoldii subsp. clystocarpus
                                                     [Potamogeton clystocarpus]
                                               Potamogeton pusillus var. major
                                             Potamogeton bicupulatus
                                                   [Potamogeton diversifolius var. trichophyllus]
                                             Potamogeton coloratus
                                             Potamogeton compressus
                                                   [Potamogeton zosterifolius]
                                             Potamogeton crispus
                                             Potamogeton distinctus
                                             Potamogeton diversifolius
                                             Potamogeton epihydrus
                                                   [Potamogeton epihydrus subsp. nuttallii]
                                                   [Potamogeton epihydrus var. nuttallii]
                                                   [Potamogeton epihydrus var. ramosus]
                                                   [Potamogeton epihydrus var. typicus]
                                             Potamogeton foliosus
                                                   [Potamogeton foliosus var. genuinus]
                                               Potamogeton foliosus subsp. fibrillosus
                                                     [Potamogeton fibrillosus]
                                                     [Potamogeton foliosus var. fibrillosus]
                                               Potamogeton foliosus subsp. foliosus
                                                     [Potamogeton foliosus var. foliosus]
                                                     [Potamogeton foliosus var. macellus]
                                             Potamogeton friesii
                                             Potamogeton gramineus
                                                   [Potamogeton gramineus var. gramineus]
                                                   [Potamogeton gramineus var. graminifolius]
                                                   [Potamogeton gramineus var. maximus]
                                                   [Potamogeton gramineus var. typicus]
                                                   [Potamogeton heterophyllus]
                                                   [Potamogeton latifolius]
                                                   [Potamogeton lonchites]
                                             Potamogeton hillii
                                             Potamogeton illinoensis
                                             Potamogeton lucens
                                                   [Potamogeton americanus]
                                             Potamogeton natans
                                                   [Spirillus natans]
                                             Potamogeton nodosus
                                             Potamogeton obtusifolius
                                             Potamogeton perfoliatus
                                                   [Potamogeton amplexicaulis]
                                                   [Potamogeton perfoliatus var. bupleuroides]
                                             Potamogeton praelongus
                                             Potamogeton pulcher
                                             Potamogeton pusillus
                                                   [Potamogeton pusillus subsp. pusillus]
                                                   [Potamogeton pusillus var. pusillus]
                                                   [Potamogeton pusillus var. vulgaris]
                                             Potamogeton richardii
                                             Potamogeton richardsonii
                                                   [Potamogeton perfoliatus subsp. richardsonii]
                                                   [Potamogeton perfoliatus var. richardsonii]
                                             Potamogeton robbinsii
                                             Potamogeton spirillus
                                             Potamogeton strictifolius
                                             Potamogeton tricarinatus
                                             Potamogeton vaseyi
                                             Potamogeton zosteriformis
                                     Spirillus
                                     Stuckenia
                                             Stuckenia filiformis
                                                   [Coleogeton filiformis]
                                                   [Potamogeton filiformis var. occidentalis]
                                                   [Potamogeton filiformis]
                                                   [Potamogeton pectinatus subsp. filiformis]
                                                   [Potamogeton pectinatus var. marinus]
                                                   [Stuckenia filiformis subsp. occidentalis]
                                                   [Stuckenia filiformis var. occidentalis]
                                               Stuckenia filiformis subsp. alpina
                                                     [Coleogeton filiformis subsp. alpinus]
                                                     [Potamogeton filiformis var. alpinus]
                                                     [Potamogeton filiformis var. macounii]
                                                     [Stuckenia filiformis var. alpina]
                                               Stuckenia filiformis subsp. filiformis
                                             Stuckenia pectinata
                                                   [Coleogeton pectinatus]
                                                   [Potamogeton diffusus]
                                                   [Potamogeton filiformis var. borealis]
                                                   [Potamogeton marinus]
                                                   [Potamogeton pectinatum]
                                                   [Potamogeton pectinatus]
                                                   [Spirillus pectiniformis]
                                             Stuckenia striata
                                                   [Coleogeton striatus]
                                                   [Potamogeton filiformis var. latifolius]
                                                   [Potamogeton latifolius]
                                                   [Potamogeton latior]
                                                   [Potamogeton pectinatus var. latifolius]
                                                   [Potamogeton pectinatus var. striatus]
                                                   [Potamogeton striatus]
                                             Stuckenia vaginata
                                                   [Potamogeton vaginalis]
                                                   [Potamogeton vaginatus]
                                     Zannichellia
                                             Zannichellia palustris
                                                   [Pelta palustris]