Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [[crown] organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           [Domain Eucaryota]
             [Subdomain Chlorota Doweld (2001)]
               [Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants] see Subkingdom Viridiplantae Caval.-Sm. (1981)
                 [Subkingdom Pteridobiotina Britton & A. Br. (1896)]
                   Superphylum Cycadophytanae Doweld (2001)
                     [Phylum Gnetophyta Bessey (1907)] see Subclass Gnetidae Pax (1894)
                       2 [Class Ephedropsida Reveal (1996) [monotypic]]
                       3 [Class Welwitschiopsida Boivin (1956) [monotypic]]