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• n  erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers; the eastern United States
• n  common North American weed with linear leaves and small discoid heads of yellowish flowers; widely naturalized throughout temperate regions; sometimes placed in genus Erigeron

• horse balm
• stoneroot
• stone-root
• richweed
• stone root
• Collinsonia canadensis
• Canadian fleabane
• fleabane
• Conyza canadensis
• Erigeron canadensis

News & Articles

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• Fall herbicides to control marestail
  URBANA — Widespread and often very dense populations of marestail (horseweed) in soybean fields last spring caught the attention of farmers and other weed management practitioners, with many c…
  Oct. 26, 2013 - Journal Gazette & Times-Courier