scrub oak

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

• noun Any of several oaks that form shrubby thickets, especially Quercus ilicifolia of eastern North America or Q. dumosa of western North America.

from The Century Dictionary.

• noun A name of three low American oaks.

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

• noun US the popular name of several dwarfish species of oak in the United States.

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

• noun any of various chiefly American small shrubby oaks often a dominant form on thin dry soils sometimes forming dense thickets