Pflanzenreich Haeckel (1866) - plants
   Division Embryophyta siphonogama
     Subdivision Gymnospermae see Infraphylum Gymnospermae auct.
       1 Class Cycadales Dumort. (1829) see Order Cycadales Pers. ex Bercht. & J.Presl (1820)
       2 Class †Bennettitales Engl. (1892), orth. inval. see Class Bennettitopsida Engl. (1892)
       3 Class †Cordaitales Scott (1909)
       4 Class Ginkgoales Goroschankin (1904)
       5 Class Coniferae Juss. (1789) see Class Pinopsida Burnett (1835)
       6 Class Gnetales Martius (1835)