plants Haeckel (1866) - plants
   Division Charophyta Migula (1889) - charophyte algae and embryophytes see charophytes
     Subdivision [Streptophytina] see [unranked] Streptophytina Lewis & McCourt (2004)
       Class Equisetopsida C.Agardh (1825) - horsetails see Subclass Equisetidae Warm. (1883)
         Vascular Plants see Phylum Tracheophyta Sinnott ex Caval.-Sm. (1998)
           [Seed-Plants; Spermatophyta]
             Gymnosperms see Class Spermatopsida
               Subclass Gnetidae Pax (1894) [monotypic] see Class Gnetopsida Eichler ex Kirpot. (1884)
                 Order Gnetales Mart. (1835)
                   1 Family Gnetaceae Blume (1833), nom. cons. - Gnetum family
                   2 Family Ephedraceae Dumort. (1829), nom. cons. - Mormon-tea family
                   3 Family Welwitschiaceae Caruel (1879), nom. cons.