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  Plantae
      Magnoliophyta
            Liliopsida
                    Najadales
                            Potamogetonaceae
                                     Buccaferrea
                                     Coleogeton
                                     Hydrogeton
                                     Pelta
                                     Peltopsis
                                     Posidonia
                                             Posidonia australis
                                     Potamogeton
                                             Potamogeton acutifolius
                                             Potamogeton alpinus
                                                   [Buccaferrea rufescens]
                                                   [Potamogeton alpinonatans]
                                                   [Potamogeton alpinus subsp. tenuifolius]
                                                   [Potamogeton alpinus var. angustifolius]
                                                   [Potamogeton alpinus var. faxonii]
                                                   [Potamogeton alpinus var. obscurus]
                                                   [Potamogeton alpinus var. subellipticus]
                                                   [Potamogeton alpinus var. tenuifolius]
                                                   [Potamogeton annulatus]
                                                   [Potamogeton caricifolius]
                                                   [Potamogeton casparii]
                                                   [Potamogeton microstachys var. subellipticus]
                                                   [Potamogeton microstachys]
                                                   [Potamogeton nigrescens]
                                                   [Potamogeton obrutus]
                                                   [Potamogeton obscurus]
                                                   [Potamogeton obtusus]
                                                   [Potamogeton purpurascens]
                                                   [Potamogeton rigidus]
                                                   [Potamogeton rufescens subsp. nigrescens]
                                                   [Potamogeton rufescens subsp. rigidus]
                                                   [Potamogeton rufescens]
                                                   [Potamogeton semipellucidus]
                                                   [Potamogeton stylatus]
                                                   [Potamogeton tenuifolius var. subellipticus]
                                                   [Potamogeton tenuifolius]
                                                   [Potamogeton thomasii]
                                             Potamogeton angustifolius
                                             Potamogeton aschersonii
                                             Potamogeton berchtoldii
                                                   [Potamogeton pusillus var. berchtoldii]
                                             Potamogeton compressus
                                                   [Potamogeton complanatus]
                                                   [Potamogeton compressus var. acutus]
                                                   [Potamogeton compressus var. dimidius]
                                                   [Potamogeton compressus var. obtusus]
                                                   [Potamogeton cuspidatus]
                                                   [Potamogeton reflexus]
                                                   [Potamogeton zosterifolius f. selenocarpus]
                                                   [Potamogeton zosterifolius subsp. zosteriformis]
                                                   [Potamogeton zosterifolius var. americanus]
                                                   [Potamogeton zosterifolius var. minor]
                                                   [Potamogeton zosterifolius]
                                                   [Potamogeton zosteriformis]
                                                   [Potamogeton zosterophyllus]
                                                   [Spirillus zizii]
                                                   [Spirillus zosterifolius]
                                             Potamogeton crispus
                                                   [Buccaferrea crispata]
                                                   [Potamogeton concinnitus]
                                                   [Potamogeton crenulatus]
                                                   [Potamogeton crispatus]
                                                   [Potamogeton crispus var. gemmifer]
                                                   [Potamogeton crispus var. najadoides]
                                                   [Potamogeton crispus var. phialiensis]
                                                   [Potamogeton crispus var. serrulatus]
                                                   [Potamogeton lactucaceum]
                                                   [Potamogeton macrorrhynchus]
                                                   [Potamogeton tuberosus]
                                             Potamogeton cristatus
                                                   [Potamogeton iriomotensis]
                                                   [Potamogeton iwatensis]
                                             Potamogeton dentatus
                                                   [Potamogeton lucens var. teganumensis]
                                                   [Potamogeton teganumensis]
                                             Potamogeton distinctus
                                                   [Potamogeton alatus]
                                                   [Potamogeton distinctus var. tonkinensis]
                                                   [Potamogeton fontigenus]
                                                   [Potamogeton franchetii]
                                                   [Potamogeton longipetiolatus]
                                                   [Potamogeton malaianus var. tenuior]
                                                   [Potamogeton natans f. indicus]
                                                   [Potamogeton perversus]
                                                   [Potamogeton polygonifolius]
                                                   [Potamogeton tepperi]
                                                   [Potamogeton tonkinensis]
                                             Potamogeton friesii
                                                   [Potamogeton mucronatus]
                                                   [Potamogeton pusillus subsp. friesii]
                                             Potamogeton fryeri
                                                   [Potamogeton subsessilifolius]
                                                   [Potamogeton torquatus]
                                             Potamogeton gramineus
                                                   [Potamogeton gramineus var. heterophyllus]
                                                   [Potamogeton heterocaulis]
                                                   [Potamogeton heterophyllus]
                                             Potamogeton helveticus
                                             Potamogeton lateralis
                                             Potamogeton lucens
                                                   [Buccaferrea lucida]
                                                   [Potamogeton acuminatus]
                                                   [Potamogeton americanus]
                                                   [Potamogeton caudatus]
                                                   [Potamogeton coriaceus]
                                                   [Potamogeton corniculatus]
                                                   [Potamogeton cornutus]
                                                   [Potamogeton gaudichaudii]
                                                   [Potamogeton gramineus subsp. zizii]
                                                   [Potamogeton lindenbergii]
                                                   [Potamogeton longifolius]
                                                   [Potamogeton lucens f. longifolius]
                                                   [Potamogeton lucens subsp. brasiliensis]
                                                   [Potamogeton lucens subsp. macrophyllus]
                                                   [Potamogeton lucens subsp. sinicus]
                                                   [Potamogeton lucens subsp. vaginans]
                                                   [Potamogeton lucens subsp. zizii]
                                                   [Potamogeton lucens var. acuminatus]
                                                   [Potamogeton lucens var. coriaceus]
                                                   [Potamogeton lucens var. fluitans]
                                                   [Potamogeton lucens var. longifolius]
                                                   [Potamogeton lucens var. zizii]
                                                   [Potamogeton macrophyllus]
                                                   [Potamogeton proteus]
                                                   [Potamogeton sinicus]
                                                   [Potamogeton volhynicus]
                                                   [Potamogeton zizii f. pulcherrimus]
                                                   [Potamogeton zizii var. gracilis]
                                                   [Potamogeton zizii var. porrectifolius]
                                                   [Potamogeton zizii]
                                                   [Spirillus lucens]
                                             Potamogeton maackianus
                                                   [Potamogeton robbinsii var. japonicus]
                                                   [Potamogeton serrulatus]
                                                   [Potamogeton surrulatus]
                                             Potamogeton mandschuriensis
                                             Potamogeton manschuriensis
                                                   [Potamogeton acutifolius subsp. mandschuriensis]
                                             Potamogeton natans
                                                   [Buccaferrea natans]
                                                   [Buccaferrea variifolia]
                                                   [Potamogeton affinis]
                                                   [Potamogeton besseri]
                                                   [Potamogeton gramineus subsp. variifolius]
                                                   [Potamogeton kirkii]
                                                   [Potamogeton morongii]
                                                   [Potamogeton natans subsp. kirkii]
                                                   [Potamogeton natans subsp. petiolatus]
                                                   [Potamogeton natans var. major]
                                                   [Potamogeton natans var. petiolaris]
                                                   [Potamogeton paludosus]
                                                   [Potamogeton petiolatus]
                                                   [Potamogeton plantago]
                                                   [Potamogeton polygonifolius var. parnassiifolius]
                                                   [Potamogeton samariformis]
                                                   [Potamogeton uliginosus]
                                                   [Spirillus natans]
                                             Potamogeton nodosus
                                                   [Potamogeton indicus]
                                                   [Potamogeton malaianus]
                                             Potamogeton nomotoensis
                                             Potamogeton obtusifolius
                                             Potamogeton octandrus
                                                   [Hydrogeton heterophyllus]
                                                   [Potamogeton asiaticus]
                                                   [Potamogeton hubeiensis]
                                                   [Potamogeton huillensis]
                                                   [Potamogeton javanicus var. major]
                                                   [Potamogeton javanicus]
                                                   [Potamogeton ligulatus]
                                                   [Potamogeton limosellifolius]
                                                   [Potamogeton miduhikimo]
                                                   [Potamogeton mizuhikimo]
                                                   [Potamogeton numasakianus]
                                                   [Potamogeton octandrus subsp. limosellifolius]
                                                   [Potamogeton octandrus var. asiaticus]
                                                   [Potamogeton octandrus var. limosellifolius]
                                                   [Potamogeton octandrus var. minduhikimo]
                                                   [Potamogeton octandrus var. mizuhikimo]
                                                   [Potamogeton parvifolius]
                                                   [Potamogeton preussii]
                                                   [Potamogeton subfuscus]
                                                   [Potamogeton tenuicaulis]
                                             Potamogeton oxyphyllus
                                                   [Potamogeton chongyongensis]
                                             Potamogeton perfoliatus
                                                   [Buccaferrea amplexicaulis]
                                                   [Peltopsis perfoliata]
                                                   [Potamogeton amplexicaulis]
                                                   [Potamogeton bupleuroides]
                                                   [Potamogeton juzepczukii]
                                                   [Potamogeton loeselii]
                                                   [Potamogeton perfoliatus subsp. bupleuroides]
                                                   [Potamogeton perfoliatus var. bupleuroides]
                                                   [Potamogeton perfoliatus var. lacustris]
                                                   [Potamogeton perfoliatus var. lanceolatus]
                                                   [Potamogeton perfoliatus var. mandschuriensis]
                                                   [Potamogeton perfoliatus var. mandshuriensis]
                                                   [Potamogeton perfoliatus var. minor]
                                                   [Potamogeton perfoliatus var. muelleri]
                                                   [Spirillus perfoliatus]
                                             Potamogeton praelongus
                                                   [Potamogeton flexuosus]
                                                   [Potamogeton praelongus f. pygmaeus]
                                                   [Spirillus praelongus]
                                             Potamogeton pusillus
                                                   [Buccaferrea pusilla]
                                                   [Potamogeton aschersonii f. pusilloides]
                                                   [Potamogeton aschersonii]
                                                   [Potamogeton berchtoldii f. ramosissimus]
                                                   [Potamogeton berchtoldii subsp. groenlandicus]
                                                   [Potamogeton berchtoldii subsp. tenuissimus]
                                                   [Potamogeton berchtoldii var. colpophilus]
                                                   [Potamogeton berchtoldii var. lacunatus]
                                                   [Potamogeton berchtoldii var. major]
                                                   [Potamogeton berchtoldii var. mucronatus]
                                                   [Potamogeton berchtoldii var. polyphyllus]
                                                   [Potamogeton berchtoldii var. tenuissimus]
                                                   [Potamogeton berteroanus]
                                                   [Potamogeton caespitosus]
                                                   [Potamogeton compressus var. elongatus]
                                                   [Potamogeton denticulatus]
                                                   [Potamogeton fieberi]
                                                   [Potamogeton groenlandicus]
                                                   [Potamogeton lacunatus]
                                                   [Potamogeton lateralis f. incompletus]
                                                   [Potamogeton lateralis f. subcompletus]
                                                   [Potamogeton lateralis]
                                                   [Potamogeton panormitanus var. major]
                                                   [Potamogeton panormitanus var. minor]
                                                   [Potamogeton panormitanus]
                                                   [Potamogeton pusillus f. tenuissimus]
                                                   [Potamogeton pusillus subsp. argentinus]
                                                   [Potamogeton pusillus subsp. groenlandicus]
                                                   [Potamogeton pusillus subsp. sturrockii]
                                                   [Potamogeton pusillus subsp. tenuissimus]
                                                   [Potamogeton pusillus var. africanus]
                                                   [Potamogeton pusillus var. capitatus]
                                                   [Potamogeton pusillus var. colpophilus]
                                                   [Potamogeton pusillus var. elongatus]
                                                   [Potamogeton pusillus var. lacunatus]
                                                   [Potamogeton pusillus var. longipedunculatus]
                                                   [Potamogeton pusillus var. minor]
                                                   [Potamogeton pusillus var. panormitanus]
                                                   [Potamogeton pusillus var. polyphyllus]
                                                   [Potamogeton pusillus var. pseudorutilus]
                                                   [Potamogeton pusillus var. sphaerocarpus]
                                                   [Potamogeton pusillus var. tenuifolius]
                                                   [Potamogeton pusillus var. tenuissimus]
                                                   [Potamogeton pusillus var. vulgaris]
                                                   [Potamogeton reichenbachii]
                                                   [Potamogeton rutilus subsp. caespitosus]
                                                   [Potamogeton sturrockii]
                                                   [Potamogeton subjavanicus]
                                                   [Potamogeton subtrichodes]
                                                   [Potamogeton tenuissimus]
                                                   [Spirillus pusillus]
                                             Potamogeton richardsonii
                                                   [Potamogeton perfoliatus subsp. richardsonii]
                                                   [Potamogeton perfoliatus var. richardsonii]
                                                   [Potamogeton perfoliatus var. sachalinensis]
                                                   [Potamogeton sachalinensis]
                                                   [Spirillus perfoliatus var. richardsonii]
                                             Potamogeton robbinsii
                                             Potamogeton rufescens
                                             Potamogeton rutilus
                                             Potamogeton sibiricus
                                                   [Potamogeton subsibiricus]
                                             Potamogeton vaginatus
                                             Potamogeton wrightii
                                                   [Potamogeton intortusifolius]
                                                   [Potamogeton japonicus]
                                                   [Potamogeton malaianus var. latifolius]
                                                   [Potamogeton miyakozimensis]
                                                   [Potamogeton tretocarpus]
                                             Potamogeton zizii
                                     Spirillus
                                             Spirillus perfoliatus
                                     Stuckenia
                                             Stuckenia amblyophylla
                                                   [Potamogeton amblyophyllus]
                                             Stuckenia filiformis
                                                   [Potamogeton applanatus]
                                                   [Potamogeton filiformis var. applanatus]
                                                   [Potamogeton filiformis]
                                                   [Potamogeton rostratus]
                                             Stuckenia pamirica
                                                   [Potamogeton pamiricus]
                                                   [Potamogeton recurvatus]
                                             Stuckenia pectinata
                                                   [Buccaferrea pectinata]
                                                   [Coleogeton pectinatus]
                                                   [Potamogeton acifolius]
                                                   [Potamogeton angustifolius f. longipedunculatus]
                                                   [Potamogeton angustissimus]
                                                   [Potamogeton balatonicus]
                                                   [Potamogeton borealis]
                                                   [Potamogeton bracteatus]
                                                   [Potamogeton chakassiensis var. tenuior]
                                                   [Potamogeton chakassiensis]
                                                   [Potamogeton columbianus]
                                                   [Potamogeton diffusus]
                                                   [Potamogeton drupaceus]
                                                   [Potamogeton erhaiensis]
                                                   [Potamogeton exstipulatus]
                                                   [Potamogeton filicaulis]
                                                   [Potamogeton filiformis var. borealis]
                                                   [Potamogeton filiformis var. helveticus]
                                                   [Potamogeton filiformis var. latifolius]
                                                   [Potamogeton flabellatus]
                                                   [Potamogeton helveticus var. balatonicus]
                                                   [Potamogeton helveticus]
                                                   [Potamogeton interruptus]
                                                   [Potamogeton intramongolicus]
                                                   [Potamogeton latior]
                                                   [Potamogeton leptanthus]
                                                   [Potamogeton livingstonei]
                                                   [Potamogeton lucens f. longipedunculatus]
                                                   [Potamogeton marinus]
                                                   [Potamogeton miniatus]
                                                   [Potamogeton nanus]
                                                   [Potamogeton pectinatus f. brachypus]
                                                   [Potamogeton pectinatus f. coronatus]
                                                   [Potamogeton pectinatus f. dichotomus]
                                                   [Potamogeton pectinatus f. geminatus]
                                                   [Potamogeton pectinatus f. glaucescens]
                                                   [Potamogeton pectinatus f. interruptus]
                                                   [Potamogeton pectinatus f. potensus]
                                                   [Potamogeton pectinatus f. scoparius]
                                                   [Potamogeton pectinatus f. subdrupaceus]
                                                   [Potamogeton pectinatus f. vulgaris]
                                                   [Potamogeton pectinatus f. zosteraceus]
                                                   [Potamogeton pectinatus f. zosteroides]
                                                   [Potamogeton pectinatus subsp. balatonicus]
                                                   [Potamogeton pectinatus subsp. chakassiensis]
                                                   [Potamogeton pectinatus subsp. flabellatus]
                                                   [Potamogeton pectinatus subsp. helveticus]
                                                   [Potamogeton pectinatus subsp. mongolicus]
                                                   [Potamogeton pectinatus var. caespitosus]
                                                   [Potamogeton pectinatus var. coronatus]
                                                   [Potamogeton pectinatus var. dichotomus]
                                                   [Potamogeton pectinatus var. diffusus]
                                                   [Potamogeton pectinatus var. flabellatus]
                                                   [Potamogeton pectinatus var. foliosus]
                                                   [Potamogeton pectinatus var. gracilis]
                                                   [Potamogeton pectinatus var. helveticus]
                                                   [Potamogeton pectinatus var. interruptus]
                                                   [Potamogeton pectinatus var. latifolius]
                                                   [Potamogeton pectinatus var. marinus]
                                                   [Potamogeton pectinatus var. mongolicus]
                                                   [Potamogeton pectinatus var. potensus]
                                                   [Potamogeton pectinatus var. protensis]
                                                   [Potamogeton pectinatus var. ramosissimus]
                                                   [Potamogeton pectinatus var. scoparius]
                                                   [Potamogeton pectinatus var. tenuis]
                                                   [Potamogeton pectinatus var. zosteraceus]
                                                   [Potamogeton pectinatus]
                                                   [Potamogeton pusillus subsp. flabellatus]
                                                   [Potamogeton pusillus var. interruptus]
                                                   [Potamogeton siculus]
                                                   [Potamogeton vaginatus f. helveticus]
                                                   [Potamogeton vaginatus subsp. helveticus]
                                                   [Potamogeton vaginatus var. helveticus]
                                                   [Potamogeton vaillantii]
                                                   [Potamogeton zosteraceus]
                                                   [Spirillus interruptus]
                                                   [Stuckenia chakassiensis]
                                                   [Stuckenia filiformis subsp. borealis]
                                                   [Stuckenia helvetica]
                                                   [Stuckenia marina]
                                                   [Stuckenia mongolica]
                                                   [Stuckenia zosteracea]
                                             Stuckenia vaginata
                                                   [Potamogeton moniliformis]
                                                   [Potamogeton pectinatus subsp. vaginatus]
                                                   [Potamogeton pectinatus var. vaginatus]
                                                   [Potamogeton subretusus]
                                                   [Potamogeton vaginatus var. canadensis]
                                                   [Potamogeton vaginatus]
                                                   [Stuckenia subretusa]
                                     Zannichellia
                                             Zannichellia palustris
                                                   [Zannichellia aculeata]
                                                   [Zannichellia brachystemon]
                                                   [Zannichellia clausii]
                                                   [Zannichellia cothenetii]
                                                   [Zannichellia echinata]
                                                   [Zannichellia geniculata]
                                                   [Zannichellia graminifolia]
                                                   [Zannichellia indica]
                                                   [Zannichellia intermedia]
                                                   [Zannichellia komarovii]
                                                   [Zannichellia laevis]
                                                   [Zannichellia lingulata]
                                                   [Zannichellia melitensis]
                                                   [Zannichellia palustris subsp. aculeata]
                                                   [Zannichellia palustris subsp. pedicellata]
                                                   [Zannichellia palustris subsp. polycarpa]
                                                   [Zannichellia palustris subsp. repens]
                                                   [Zannichellia palustris subsp. rosenii]
                                                   [Zannichellia palustris subsp. tenuis]
                                                   [Zannichellia palustris var. aculeata]
                                                   [Zannichellia palustris var. indica]
                                                   [Zannichellia palustris var. japonica]
                                                   [Zannichellia palustris var. minor]
                                                   [Zannichellia palustris var. muricata]
                                                   [Zannichellia palustris var. pedicellata]
                                                   [Zannichellia palustris var. pedunculata]
                                                   [Zannichellia palustris var. polycarpa]
                                                   [Zannichellia palustris var. radicans]
                                                   [Zannichellia palustris var. repens]
                                                   [Zannichellia palustris var. stipitata]
                                                   [Zannichellia pedicellata]
                                                   [Zannichellia pedunculata]
                                                   [Zannichellia polycarpa]
                                                   [Zannichellia prodanii]
                                                   [Zannichellia pumila]
                                                   [Zannichellia qinghaiensis]
                                                   [Zannichellia radicans]
                                                   [Zannichellia repens var. aerea]
                                                   [Zannichellia repens var. viridis]
                                                   [Zannichellia repens]
                                                   [Zannichellia rosenii]
                                                   [Zannichellia subulata]
                                                   [Zannichellia tenuis]