Class Equisetopsida C.Agardh (1825) - horsetails see Subclass Equisetidae Warm. (1883)
   gymnosperms see Class Spermatopsida
     Subclass Cycadidae Pax (1894) - cycads
       Order Cycadales Pers. ex Bercht. & J.Presl (1820) - cycads
         Family Zamiaceae Horan. (1834)
           1 Genus Dioon Lindl. (1843), nom. cons., orth. cons.
           2 Genus Bowenia Hook.f. (1863)
           3 Genus Macrozamia Miq. (1842)
           4 Genus Lepidozamia Regel (1857)
           5 Genus Encephalartos Lehm. (1834)
           6 Genus Stangeria T.Moore (1853)
           7 Genus Ceratozamia Brongn. (1846)
           8 Genus Microcycas (Miq.) A.DC. (1868)
           9 Genus Zamia L. (1763), nom. cons.