organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020] Domain Eukaryota Chatton, 1925 - eukaryotes Kingdom Plantae Haeckel (1866) - plants Subkingdom Viridaeplantae Cavalier-Sm. (1981) - green plants see [unranked] Viridiplantae Cavalier-Smith, 1981 Land plants Phylum Cycadophyta Bessey (1907) see Subclass Cycadidae Pax (1894) Order †Bennettitales Bessey (1910) see Order Cycadeoideales E.W.Berry (1916) Family †Williamsoniaceae Nath. (1913)