Phylum Magnoliophyta Cronquist, Takht. & Zimmerm. ex Reveal (1996) see Infraphylum Angiospermae auct.
   Class Magnoliopsida Brongn. (1843)
     Subclass Dilleniidae Takht. ex Reveal & Tahkt. (1993) see Order Dilleniales DC. ex Bercht. & J.Presl (1820)
       Superorder Urticanae Takht. ex Reveal (1992) see Order Rosales Bercht. & J.Presl (1820)
         Order Urticales Dumort. (1829) see Order Rosales Bercht. & J.Presl (1820)
           Family Ulmaceae Mirb. (1815), nom. cons. - elm family
             Subfamily Ulmoideae see Family Ulmaceae Mirb. (1815), nom. cons.
               Genus Zelkova Spach (1841), nom. cons.