Phylum Magnoliophyta Cronquist, Takht. & Zimmerm. ex Reveal (1996) see Infraphylum Angiospermae auct.
   Class Magnoliopsida Brongn. (1843)
     Subclass Hamamelididae Takht. (1967)
       Superorder Faganae Takht. (1997) see Order Fagales Engl. (1892)
         Order Corylales Dumort. (1829)
           Family Corylaceae Mirb. (1815), nom. cons. see Subfamily Coryloideae (Mirb., 1815) Hook.f. (1870)
             Subfamily Carpinoideae (Vest, 1818) Rouy (1910) see Subfamily Coryloideae (Mirb., 1815) Hook.f. (1870)
               Genus Ostrya Scopoli (1760), nom. cons.