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Organism
  Plantae
   Viridiplantae
     Streptophyta
     Embryophyta
      Tracheophyta
        Spermatophytina
            Magnoliopsida
                  Lilianae
                         [Liliopsida]
                    Alismatales
                            Hydrocharitaceae
                                     Anacharis
                                     Blyxa
                                             Blyxa aubertii
                                     Caulinia
                                     Egeria
                                             Egeria densa
                                                   [Anacharis densa]
                                                   [Elodea densa]
                                                   [Philotria densa]
                                             Egeria najas
                                     Elodea
                                             Elodea bifoliata
                                                   [Elodea longivaginata]
                                                   [Elodea nevadensis]
                                             Elodea callitrichoides
                                                   [Elodea ernstiae]
                                             Elodea canadensis
                                                   [Anacharis canadensis]
                                                   [Elodea brandegeeae]
                                                   [Elodea occidentalis]
                                                   [Hydora canadensis]
                                                   [Philotria linearis]
                                                   [Serpicula canadensis]
                                                   [Udora canadensis]
                                             Elodea nuttallii
                                                   [Anacharis nuttallii]
                                                   [Elodea columbiana]
                                                   [Philotria nuttallii]
                                     Enhalus
                                             Enhalus acoroides
                                     Fluvialis
                                     Halophila
                                             Halophila baillonis
                                             Halophila engelmannii
                                             Halophila hawaiiana
                                             Halophila ovalis
                                               Halophila ovalis subsp. bullosa
                                                     [Halophila ovalis var. bullosa]
                                     Hydora
                                     Hydrilla
                                             Hydrilla verticillata
                                     Hydrocharis
                                             Hydrocharis dubia
                                             Hydrocharis morsus-ranae
                                     Hydromystria
                                     Lagarosiphon
                                             Lagarosiphon cordofanus
                                                   [Lagarosiphon crispus]
                                             Lagarosiphon madagascariensis
                                             Lagarosiphon major
                                             Lagarosiphon verticillifolius
                                     Limnobium
                                             Limnobium laevigatum
                                                   [Hydromystria laevigata]
                                                   [Limnobium spongia subsp. laevigatum]
                                                   [Salvinia laevigata]
                                             Limnobium spongia
                                                   [Hydrocharis spongia]
                                               Limnobium spongia subsp. spongia
                                     Najas
                                             Najas flexilis
                                                   [Caulinia flexilis]
                                                   [Fluvialis flexilis]
                                                   [Najas flexilis subsp. caespitosus]
                                             Najas gracillima
                                                   [Najas indica var. gracillima]
                                             Najas graminea
                                                   [Caulinia graminea]
                                                   [Najas graminea var. delilei]
                                             Najas guadalupensis
                                               Najas guadalupensis subsp. guadalupensis
                                                     [Najas guadalupensis var. guadalupensis]
                                               Najas guadalupensis subsp. olivacea
                                                     [Najas olivacea]
                                             Najas indica
                                             Najas marina
                                                   [Najas marina subsp. marina]
                                                   [Najas marina var. marina]
                                             Najas minor
                                     Nechamandra
                                             Nechamandra alternifolia
                                                   [Vallisneria alternifolia]
                                     Ottelia
                                             Ottelia alismoides
                                                   [Damasonium alismoides]
                                                   [Stratiotes alismoides]
                                     Philotria
                                     Serpicula
                                     Stratiotes
                                     Thalassia
                                             Thalassia testudinum
                                     Udora
                                     Vallisneria
                                           [Maidenia]
                                             Vallisneria americana
                                             Vallisneria australis
                                             Vallisneria natans
                                             Vallisneria rubra
                                                   [Maidenia rubra]
                                             Vallisneria spiralis