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  Plantae
    Tracheophyta
           [Tracheobionta]
    Spermatophyta
      Magnoliophyta
             [Angiospermae]
         Monocots
                [Liliatae]
                [Liliopsida]
                [Monocotyledoneae]
                    Alismatales
                            Ruppiaceae
                                     Ruppia
                                             Ruppia anomala
                                             Ruppia cirrhosa
                                                   [Ruppia cirrhosa subsp. occidentalis]
                                                   [Ruppia lacustris]
                                                   [Ruppia maritima var. occidentalis]
                                                   [Ruppia maritima var. spiralis]
                                                   [Ruppia occidentalis]
                                                   [Ruppia spiralis]
                                             Ruppia didyma
                                             Ruppia drepanensis
                                             Ruppia maritima
                                                   [Ruppia brachypus]
                                                   [Ruppia curvicarpa]
                                                   [Ruppia maritima var. brevirostis]
                                                   [Ruppia maritima var. brevirostris]
                                                   [Ruppia maritima var. curvicarpa]
                                                   [Ruppia maritima var. exigua]
                                                   [Ruppia maritima var. intermedia]
                                                   [Ruppia maritima var. longipes]
                                                   [Ruppia maritima var. maritima]
                                                   [Ruppia maritima var. obliqua]
                                                   [Ruppia maritima var. onondagensis]
                                                   [Ruppia maritima var. pacifica]
                                                   [Ruppia maritima var. rostrata]
                                                   [Ruppia maritima var. subcapitata]
                                                   [Ruppia pectinata]
                                                   [Ruppia rostellata]
                                               Ruppia maritima subsp. rostellata
                                             Ruppia mexicana
                                             Ruppia polycarpa
                                             Ruppia tuberosa