Class Equisetopsida C.Agardh (1825) - horsetails see Subclass Equisetidae Warm. (1883)
   gymnosperms see Class Spermatopsida
     Subclass Gnetidae Pax (1894) see Class Gnetopsida Eichler ex Kirpot. (1884)
       Order Welwitschiales Skottsb. ex Reveal (1993)
         Family Welwitschiaceae Caruel (1879), nom. cons.
           1 Genus Welwitschia Hook.f. (1862), nom. cons.