hemp nettle

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

• noun Any of various Eurasian plants of the genus Galeopsis of the mint family, having bristly stems and white or reddish flowers with two lips.

from The Century Dictionary.

• noun A coarse, bristly annual weed, Galeopsis Tetrahit,of the labiate family, resembling hemp somewhat in appearance, the stiff hairs reminding one of the nettle.

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

• noun coarse bristly Eurasian plant with white or reddish flowers and foliage resembling that of a nettle; common as a weed in United States