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) A1 Subclass Cycadidae Pax (1894) [monotypic] - cycads A2 Subclass Zamiidae Doweld (2001)