- September elm, red elm, Ulmus serotina - autumn-flowering elm of southeastern United States
--1 is a kind of elm, elm tree
--1 is a member of Ulmus, genus Ulmus - slippery elm, red elm, Ulmus rubra - North American elm having rough leaves that are red when opening; yields a hard wood
--2 is a kind of elm, elm tree
--2 is a member of Ulmus, genus Ulmus