1. Erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers; the eastern United States
   - 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
   - Canadian fleabane, fleabane, Conyza canadensis, Erigeron canadensis

Derived forms: horseweeds

Type of: herb, herbaceous plant, weed

Part of: Collinsonia, Conyza, genus Collinsonia, genus Conyza

Encyclopedia: Horseweed

• horse mackerel
• horse manure
• horse mushroom
• horse nettle
• horse of the wood
• horse opera
• horse parsley
• horse racing
• horse sense
• horse thistle
• horse tick
• horse trader
• horse trading
• horse wrangler
• horse's foot
• horse-and-buggy
• horse-cart
• horse-chestnut family
• horse-drawn
• horse-drawn vehicle
• horse-pistol
• horse-race
• horse-trade
• horse-trail
• horseback