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Organism
  Plantae
      Tracheophyta
            Liliopsida
                    Alismatales
                            Hydrocharitaceae
                                     Blyxa
                                             Blyxa aubertii
                                     Egeria
                                             Egeria densa
                                                   [Anacharis densa]
                                                   [Elodea densa]
                                                   [Philotria densa]
                                     Elodea
                                             Elodea bifoliata
                                                   [Elodea longivaginata]
                                                   [Elodea nevadensis]
                                             Elodea callitrichoides
                                                   [Elodea ernstiae]
                                             Elodea canadensis
                                                   [Anacharis canadensis var. planchonii]
                                                   [Anacharis canadensis]
                                                   [Anacharis occidentalis]
                                                   [Apalanthe schweinitzii]
                                                   [Elodea brandegeeae]
                                                   [Elodea ioensis]
                                                   [Elodea linearis]
                                                   [Elodea occidentalis]
                                                   [Elodea planchonii]
                                                   [Elodea schweinitzii]
                                                   [Philotria angustifolia]
                                                   [Philotria canadensis]
                                                   [Philotria linearis]
                                                   [Philotria occidentalis]
                                             Elodea granatensis
                                             Elodea nuttallii
                                                   [Anacharis nuttallii]
                                                   [Anacharis occidentalis]
                                                   [Elodea columbiana]
                                                   [Elodea minor]
                                                   [Elodea occidentalis]
                                                   [Philotria angustifolia]
                                                   [Philotria minor]
                                                   [Philotria nuttallii]
                                                   [Philotria occidentalis]
                                                   [Udora verticillata var. minor]
                                     Halophila
                                             Halophila baillonis
                                                   [Halophila aschersonii]
                                             Halophila decipiens
                                             Halophila engelmannii
                                             Halophila hawaiiana
                                                   [Halophila ovalis subsp. hawaiiana]
                                             Halophila ovalis
                                               Halophila ovalis subsp. ovalis
                                                     [Halophila johnsonii]
                                     Hydrilla
                                             Hydrilla verticillata
                                                   [Udora verticillata]
                                     Hydrocharis
                                             Hydrocharis morsus-ranae
                                     Limnobium
                                             Limnobium bestii
                                             Limnobium dilatatum
                                             Limnobium laevigatum
                                                   [Hydromystria laevigata]
                                                   [Hydromystria stolonifera]
                                                   [Limnobium spongia subsp. laevigatum]
                                                   [Limnobium stoloniferum]
                                                   [Salvinia laevigata]
                                             Limnobium molle
                                             Limnobium ochraceum
                                             Limnobium spongia
                                                   [Hydrocharis spongia]
                                     Najas
                                             Najas ancistrocarpa
                                             Najas arguta
                                             Najas chinensis
                                             Najas conferta
                                                   [Najas arguta var. conferta]
                                             Najas filifolia
                                             Najas flexilis
                                                   [Caulinia flexilis]
                                                   [Najas caespitosa]
                                                   [Najas flexilis subsp. caespitosa]
                                                   [Najas flexilis var. congesta]
                                                   [Najas flexilis var. robusta]
                                             Najas gracillima
                                                   [Najas indica var. gracillima]
                                             Najas graminea
                                                   [Caulinia graminea]
                                               Najas graminea var. graminea
                                             Najas guadalupensis
                                                   [Caulinia guadalupensis]
                                               Najas guadalupensis subsp. floridana
                                                     [Najas guadalupensis var. floridana]
                                               Najas guadalupensis subsp. guadalupensis
                                                     [Caulinia guadalupensis]
                                               Najas guadalupensis subsp. muenscheri
                                                     [Najas guadalupensis var. muenscheri]
                                                     [Najas muenscheri]
                                               Najas guadalupensis subsp. olivacea
                                                     [Najas guadalupensis var. olivacea]
                                                     [Najas olivacea]
                                             Najas indica
                                             Najas marina
                                                   [Najas major var. angustifolia]
                                                   [Najas major]
                                                   [Najas marina var. recurvata]
                                             Najas minor
                                                   [Caulinia minor]
                                             Najas wrightiana
                                                   [Najas arguta var. conferta]
                                                   [Najas wrightiana subsp. multidentata]
                                     Ottelia
                                             Ottelia alismoides
                                                   [Stratiotes alismoides]
                                     Stratiotes
                                     Thalassia
                                             Thalassia testudinum
                                     Thalesia
                                     Vallisneria
                                             Vallisneria americana
                                                   [Vallisneria asiatica]
                                                   [Vallisneria neotropicalis]
                                                   [Vallisneria spiralis var. asiatica]
                                             Vallisneria natans
                                                   [Vallisneria asiatica]
                                             Vallisneria spiralis
                                     Valota