[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 Cymodoceaceae Vines (1895), nom. cons. - Cymodocea family
                 1 Genus Amphibolis C.Agardh (1823)
                 2 Genus Cymodocea K.D.Koenig (1805), nom. cons.
                 3 Genus Halodule Endl. (1841)
                 4 Genus Syringodium Kuetzing, in Hohenacker (1860)
                 5 Genus Thalassodendron C. den Hartog (1970)