Domain Eucaryota
   Subdomain Chlorota Doweld (2001)
     Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
       Subkingdom Pteridobiotina Britton & A. Br. (1896)
         Superphylum Cycadophytanae Doweld (2001)
           Phylum Magnoliophyta Cronquist, Takht. & Zimmerm. ex Reveal (1996) see Infraphylum Angiospermae auct.
             Subphylum Magnoliophytina Reveal (1996)
               Class Magnoliopsida Brongn. (1843)
                 Subclass Ceratophyllidae Doweld (2001) [monotypic]
                   Superorder Ceratophyllanae Takht. ex Reveal & Doweld (1999) [monotypic]
                     Order Ceratophyllales Link (1829) [monotypic]
                       Family Ceratophyllaceae Gray (1822), nom. cons. - hornwort family
                         1 Genus Ceratophyllum L. (1753)