horseweed

noun

1. common North American weed with linear leaves and small discoid heads of yellowish flowers

   Synonym:    Canadian fleabanefleabaneConyza canadensisErigeron canadensis

2. erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers

   Synonym:    horse balmstonerootstone-rootrichweedstone rootCollinsonia canadensis