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) Order Gnetales Mart. (1835) [monotypic] Family Gnetaceae Blume (1833), nom. cons. - Gnetum family Genus †Palaeognetaleana Z.-Q. Wang (2004)