[plants] Haeckel (1866) - plants
   vascular plants see Phylum Tracheophyta Sinnott ex Caval.-Sm. (1998)
     euphyllophytes see Clade Euphyllophyta Lecointre & Le Guyader 2006 [Cantino & Donoghue 2020]
       Spermatophyta Britton & Brown 1896 [Crane & Kenrick 1997], nom. cl. inval. - seed plants see Clade Spermatophyta Britton & Brown 1896 [Cantino, Doyle & Donoghue 2020]
         Class Magnoliopsida Brongn. (1843)
           Monocotyledons see Superorder Lilianae Takht. (1967)
             Order Alismatales R.Br. ex Bercht. & J.Presl (1820)
               Family Potamogetonaceae Bercht. & J.Presl (1823), nom. cons. - pondweed family
                 1 Genus Althenia Petit (1829)
                 2 Genus Groenlandia J. Gay (1854)
                 3 Genus Lepilaena J. Drummond ex Harv. (1855)
                 4 Genus Potamogeton L. (1753)
                 5 Genus Pseudalthenia
                 6 Genus Stuckenia
                 7 Genus Zannichellia L. (1753)