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 Ginkgophyta Bessey (1907) [monotypic] see Phylum Ginkgophyta Bessey (1907)
         Class Ginkgoopsida Engl. (1897)
           Order †Karkeniales Doweld (2001)
             Family †Karkeniaceae Krassilov (1972)
               Genus †Sphenobaieroanthus X.H.Yang (1986), nom. inval.