orange hawkweed

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

• noun A weedy perennial plant (Hieracium aurantiacum) native to Europe and naturalized in North America, having hairy leaves and clusters of orange-red flower heads.

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

• noun European hawkweed having flower heads with bright orange-red rays; a troublesome weed especially as naturalized in northeastern North America; sometimes placed in genus Hieracium