[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)
           Order Nymphaeales Salisb. ex Bercht. & J.Presl (1820)
             1.1 Family Nymphaeaceae Salisb. (1805), nom. cons. - water lilies
             1.2 Family Cabombaceae Rich. ex A.Rich. (1822), nom. cons. - water-shield family
             2 Family Hydatellaceae U.Hamann (1976)