white poplar

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

• noun A poplar tree (Populus alba) native to Eurasia and naturalized in parts of North America, having lobed leaves with whitish undersides.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Populus alba, a poplar found in Central Europe.

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

• noun a poplar that is widely cultivated in the United States; has white bark and leaves with whitish undersurfaces
• noun light easily worked wood of a tulip tree; used for furniture and veneer