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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; common North American weed with linear leaves and small discoid heads of yellowish flowers; widely naturalized throughout temperate regions; sometimes placed in genus Erigeron ❲Conyza canadensis, Erigeron canadensis❳ |