Domain Eucaryota Subdomain Chlorota Doweld (2001) Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981) Subkingdom Pteridobiotina Britton & A. Br. (1896) Superphylum Cycadophytanae Doweld (2001) Phylum Magnoliophyta Cronquist, Takht. & Zimmerm. ex Reveal (1996) see Infraphylum Angiospermae auct. Subphylum Magnoliophytina Reveal (1996) Class Liliopsida Batsch (1802) see Class Magnoliopsida Brongn. (1843) Subclass Alismatidae Takht. (1967) see Order Alismatales R.Br. ex Bercht. & J.Presl (1820) Superorder Zosteranae Doweld (2001) Order Potamogetonales Dumort. (1829) see Order Alismatales R.Br. ex Bercht. & J.Presl (1820) 1 Family Potamogetonaceae Bercht. & J.Presl (1823), nom. cons. - pondweed family 2 Family Ruppiaceae Horan. (1834), nom. cons. - ditch-grass family