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Definition of 'horseweed'


  1. 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
  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
       Synonyms: Canadian fleabane fleabane Conyza canadensis Erigeron canadensis

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