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
               Family †Crossozamiaceae Doweld (2001)
                 1 Genus †Crossozamia Pomel (1849)
                 2 Genus †Taeniopteris Brongn. (1828)
                 3 Genus †Tianbaolinia Z. Gao & B.A.Thomas (1989)
                 4 Genus †Yuania H.C.Sze (1953)