1. (noun) horse balm, horseweed, stoneroot, stone-root, richweed, stone root, Collinsonia canadensis
erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers; the eastern United States
Synonyms: stone root, richweed, fleabane, horse balm, dead nettle, clearweed, stoneroot, horseweed, stone-root
2. (noun) horseweed, Canadian fleabane, fleabane, Conyza canadensis, Erigeron canadensis
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: stone root, richweed, fleabane, horse balm, feabane mullet, stoneroot, horseweed, stone-root
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Synonyms for horseweed 
