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 Gnetales Mart. (1835)
         1 Family Gnetaceae Blume (1833), nom. cons. - Gnetum family