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 Cycadophyta Bessey (1907) see Subclass Cycadidae Pax (1894)
             Class Cycadopsida Brongn. (1843)
               Subclass Cycadidae Pax (1894) [monotypic] - cycads
                 Order Cycadales Pers. ex Bercht. & J.Presl (1820) - cycads
                   Family †Crossozamiaceae Doweld (2001) [monotypic]
                     Genus †Crossozamia Pomel (1849)