organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Kingdom Plantae Haeckel (1866) - plants
     Phylum Cycadophyta Bessey (1907) see Subclass Cycadidae Pax (1894)
       Genus Dioon Lindl. (1843), nom. cons., orth. cons.