Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
   Subkingdom Pteridobiotina Britton & A. Br. (1896)
     Superdivision Cycadophytanae Doweld (2001) see Superphylum Cycadophytanae Doweld (2001)
       Division Cycadophyta Bessey (1907)
         Class Cycadopsida Brongn. (1843)
           Subclass Cycadidae Pax (1894) [monotypic] - cycads
             Order Cycadales Pers. ex Bercht. & J.Presl (1820) - cycads
               1 Family †Crossozamiaceae Doweld (2001)
               2 Family Cycadaceae Pers. (1807), nom. cons. - Cycas family