black alder

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

• noun A Eurasian alder tree (Alnus glutinosa) that grows in wet soil and is naturalized in parts of North America.

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

• noun countable, uncountable A tree, Alnus glutinosa, of many practical uses, growing in moist circumstances in Europe.
• noun uncountable Wood or other product of the tree.
• noun An alternative name for the American winterberry, Ilex verticillata.