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 Posidoniales Nakai (1943) see Order Alismatales R.Br. ex Bercht. & J.Presl (1820) Family Posidoniaceae Vines (1895), nom. cons. Genus Posidonia K.D.Koenig (1805)