American elm

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A North American deciduous tree (Ulmus americana) having double serrate leaves and winged fruits. It is grown chiefly as an ornamental shade tree but often dies from Dutch elm disease.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun large ornamental tree with graceful gradually spreading branches common in eastern North America