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 1 Family Cycadaceae Pers. (1807), nom. cons. - Cycas family 2 Family Zamiaceae Horan. (1834)