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. 1 Genus Ulmus L. (1753) - elms 2 Genus Holoptelea Planch. (1848) 3 Genus Hemiptelea Planch. (1872) 4 Genus Zelkova Spach (1841), nom. cons. 5 Genus Planera J.F. Gmelin (1791) 6 Genus Phyllostylon Capanema ex Bentham & Hook.f. (1880)