Class Equisetopsida C.Agardh (1825) - horsetails see Subclass Equisetidae Warm. (1883)
   gymnosperms see Class Spermatopsida
     Subclass Pinidae Cronquist, Takht. & Zimmerm. (1966) - conifers
       Order Cupressales Link (1829)
         Family Cupressaceae Gray (1822), nom. cons. - cypress family
           Genus Metasequoia Hu & W.C.Cheng (1948), nom. cons.