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  Plantae
    Viridiplantae
     Streptophyta
     Embryophyta
      Tracheophyta
        Spermatophytina
            Magnoliopsida
                  Lilianae
                         [Monocotyledoneae]
                    Alismatales
                           [Aponogetonales]
                           [Arales]
                           [Butomales]
                           [Cymodoceales]
                           [Elodeales]
                           [Hydrocharitales]
                           [Juncaginales]
                           [Lemnales]
                           [Najadales]
                           [Orontiales]
                           [Pistiales]
                           [Posidoniales]
                           [Potamogetonales]
                           [Ruppiales]
                           [Scheuchzeriales]
                           [Tofieldiales]
                           [Vallisneriales]
                           [Zosterales]
                            Ruppiaceae
                                     Ruppia
                                             Ruppia cirrhosa
                                                   [Ruppia cirrhosa ssp. occidentalis]
                                                   [Ruppia maritima var. occidentalis]
                                                   [Ruppia maritima var. spiralis]
                                                   [Ruppia occidentalis]
                                                   [Ruppia spiralis]
                                             Ruppia didyma
                                                   [Ruppia anomala]
                                             Ruppia maritima
                                                   [Ruppia maritima var. brevirostris]
                                                   [Ruppia maritima var. exigua]
                                                   [Ruppia maritima var. intermedia]
                                                   [Ruppia maritima var. longipes]
                                                   [Ruppia maritima var. maritima]
                                                   [Ruppia maritima var. obliqua]
                                                   [Ruppia maritima var. pacifica]
                                                   [Ruppia maritima var. rostrata]
                                                   [Ruppia maritima var. subcapitata]
                                                   [Ruppia pectinata]