Domain Eucaryota
   Subdomain Chlorota Doweld (2001)
     Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
       Subkingdom Pteridobiotina Britton & A. Br. (1896)
         Superphylum Cycadophytanae Doweld (2001)
           Phylum Magnoliophyta Cronquist, Takht. & Zimmerm. ex Reveal (1996) see Infraphylum Angiospermae auct.
             Subphylum Magnoliophytina Reveal (1996)
               Class Magnoliopsida Brongn. (1843)
                 Subclass Rosidae Takht. (1967) see Superorder Rosanae Takht. (1967)
                   Superorder Casuarinanae Takht. ex Reveal & Doweld (1999) see Order Fagales Engl. (1892)
                     Order Betulales Mart. (1835) see Order Fagales Engl. (1892)
                       1 Family Ticodendraceae Gómez-Laur. & L.D.Gómez (1991)
                       2 Family Betulaceae Gray (1822), nom. cons. - birch family