Phylum Magnoliophyta Cronquist, Takht. & Zimmerm. ex Reveal (1996) see Infraphylum Angiospermae auct. Class Liliopsida Batsch (1802) see Class Magnoliopsida Brongn. (1843) Subclass Alismatidae Takht. (1967) see Order Alismatales R.Br. ex Bercht. & J.Presl (1820) Superorder Alismatanae Takht. (1967) see Order Alismatales R.Br. ex Bercht. & J.Presl (1820) Order Potamogetonales Dumort. (1829) see Order Alismatales R.Br. ex Bercht. & J.Presl (1820) Family Ruppiaceae Horan. (1834), nom. cons. - ditch-grass family Genus Ruppia L. (1753)