[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 Hydrocharitaceae Juss. (1789), nom. cons. - tape-grass family
                 1 Genus Appertiella C.D.K. Cook & L. Triest, in J.J. Symoens et al. (1982)
                 2.1 Genus Lagarosiphon Harv. (1841)
                 2.2 Genus Nechamandra Planchon (1849)
                 3 Subfamily Hydrocharitoideae
                 4 Subfamily Stratioideae
                 5 Subfamily Anacharidioideae nom. null. see Subfamily Anacharidoideae (Endl.) Thomé (1886)
                 6 Subfamily Hydrilloideae