[Angiospermae] J. Lindley (1830) see Infraphylum Angiospermae auct.
   Monocotyledones see Class Liliopsida Batsch (1802)
     Superorder Alismatanae Takht. (1967) see Order Alismatales R.Br. ex Bercht. & J.Presl (1820)
       Order Najadales Bercht. & J.Presl (1820) see Order Alismatales R.Br. ex Bercht. & J.Presl (1820)
         Family Posidoniaceae Vines (1895), nom. cons.