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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 | |
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horseweed, richweed, horse balm, stoneroot, stone-root, stone root, Collinsonia canadensis | erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers; the eastern United States |