horseweed

n 1: erect perennial strong-scented with serrate pointed leaves

and a loose panicle of yellowish flowers; the eastern

United States [syn: {horse balm}, {stoneroot}, {richweed},

{stone root}, {Collinsonia canadensis}]

2: common North American weed with linear leaves and small

discoid heads of yellowish flowers; widely naturalized

throughout temperate regions; sometimes placed in genus

Erigeron [syn: {Canadian fleabane}, {fleabane}, {Conyza

canadensis}, {Erigeron canadensis}]