Class Equisetopsida C.Agardh (1825) - horsetails see Subclass Equisetidae Warm. (1883)
   gymnosperms see Class Spermatopsida
     Subclass Pinidae Cronquist, Takht. & Zimmerm. (1966) - conifers
       1 Order Pinales Dumort. (1829) - conifers
       2 Order Araucariales Gorozh. (1904)
       3 Order Cupressales Link (1829)