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  Plantae

      Charophyta

        Streptophytina

            Equisetopsida

              Magnoliidae

                    Alismatales

                            Hydrocharitaceae

                                     Anacharis

                                     Apalanthe

                                     Blyxa

                                             Blyxa aubertii

                                     Egeria

                                             Egeria densa

                                                   [Anacharis densa]

                                                   [Elodea densa]

                                     Elodea

                                             Elodea bifoliata

                                                   [Elodea longivaginata]

                                                   [Elodea nevadensis]

                                             Elodea callitrichoides

                                                   [Elodea ernstiae]

                                             Elodea canadensis

                                                   [Anacharis canadensis var. planchonii]

                                                   [Anacharis canadensis]

                                                   [Elodea brandegeeae]

                                                   [Elodea ioensis]

                                                   [Elodea linearis]

                                                   [Elodea planchonii]

                                             Elodea granatensis

                                             Elodea nuttallii

                                                   [Anacharis nuttallii]

                                                   [Anacharis occidentalis]

                                                   [Elodea columbiana]

                                                   [Elodea minor]

                                                   [Elodea occidentalis]

                                             Elodea schweinitzii

                                                   [Apalanthe schweinitzii]

                                             Elodes petiolata

                                     Halophila

                                             Halophila decipiens

                                             Halophila engelmannii

                                             Halophila johnsonii

                                     Hydrilla

                                             Hydrilla verticillata

                                     Hydrocharis

                                             Hydrocharis morsus-ranae

                                     Hydromystria

                                     Limnobium

                                             Limnobium laevigatum

                                                   [Hydromystria laevigata]

                                                   [Hydromystria stolonifera]

                                                   [Limnobium spongia ssp. laevigatum]

                                                   [Limnobium stoloniferum]

                                                   [Salvinia laevigata]

                                             Limnobium spongia

                                                   [Hydrocharis cordifolia]

                                                   [Hydrocharis spongia]

                                     Najas

                                             Najas affinis

                                             Najas arguta

                                               Najas arguta var. conferta

                                             Najas canadensis

                                             Najas filifolia

                                             Najas flexilis

                                                   [Caulinia flexilis]

                                                   [Najas caespitosa]

                                                   [Najas flexilis ssp. caespitosa]

                                               Najas flexilis var. congesta

                                               Najas flexilis var. robusta

                                             Najas gracillima

                                             Najas graminea

                                                   [Caulinia graminea]

                                             Najas guadalupensis

                                               Najas guadalupensis var. floridana

                                               Najas guadalupensis var. muenscheri

                                               Najas guadalupensis var. olivacea

                                               Najas guadalupensis ssp. floridana

                                               Najas guadalupensis ssp. guadalupensis

                                                     [Caulinia guadalupensis]

                                               Najas guadalupensis ssp. muenscheri

                                                     [Najas muenscheri]

                                               Najas guadalupensis ssp. olivacea

                                                     [Najas olivacea]

                                             Najas horrida

                                             Najas indica

                                             Najas marina

                                                   [Najas gracilis]

                                                   [Najas major var. angustifolia]

                                                   [Najas major]

                                               Najas marina subsp. marina

                                                     [Najas marina var. angustissima]

                                               Najas marina var. recurvata

                                             Najas minor

                                                   [Caulinia minor]

                                               Najas minor var. tenuissima

                                             Najas tenuissima

                                             Najas wrightiana

                                                   [Najas conferta]

                                                   [Najas wrightiana ssp. multidentata]

                                     Ottelia

                                             Ottelia alismoides

                                                   [Stratiotes alismoides]

                                     Philotria

                                             Philotria angustifolia

                                             Philotria canadensis

                                     Stratiotes

                                             Stratiotes aloides

                                     Thalassia

                                             Thalassia testudinum

                                     Vallisneria

                                             Vallisneria americana

                                                   [Vallisneria asiatica]

                                                   [Vallisneria neotropicalis]

                                             Vallisneria spiralis

                                               Vallisneria spiralis var. asiatica