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 Gnetophyta Bessey (1907) [monotypic] Class Gnetopsida Eichler ex Kirpot. (1884) a Order Gnetales Mart. (1835) [monotypic] b Order Ephedrales Dumort. (1829) [monotypic] c Order Welwitschiales Skottsb. ex Reveal (1993) [monotypic]