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HORSEWEED

Definition:

[noun] erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers; the eastern United States
Synonyms: horse balm, stoneroot, stone-root, richweed, stone root, Collinsonia canadensis
[noun] common North American weed with linear leaves and small discoid heads of yellowish flowers; widely naturalized throughout temperate regions; sometimes placed in genus Erigeron
Synonyms: Canadian fleabane, fleabane, Conyza canadensis, Erigeron canadensis