Althenia Petit Coleogeton Les & Haynes = Potamogeton L. Groenlandia J. Gay Hydrogeton Loureiro = Potamogeton L. Hydrogetones Link = Potamogeton L. Lepilaena Harvey = Althenia Petit Potamogeton L. Pseudoalthenia Nakai Stuckenia Börner = Potamogeton L. Vleisia Tomlinson & Posluszny = Pseudoalthenia Nakai Zannichellia L.
For genera, see Haynes et al. (1998) and Ito et al. (2016); Lindqvist et al. (2006) prefer to recognize Stuckenia as a genus, it is sister to Potamogeton.