Meaning: common North American weed with linear leaves and small discoid heads of yellowish flowers Examples: widely naturalized throughout temperate regions. sometimes placed in genus Erigeron Synonyms: horseweed,Canadian_fleabane,fleabane,Conyza_canadensis,Erigeron_canadensis
Meaning: erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers Examples: the eastern United States Synonyms: horse_balm,horseweed,stoneroot,stone-root,richweed,stone_root,Collinsonia_canadensis
