1) Collinsonia canadensis 2) Herb 3) Herbaceous plant 4) Horse balm 5) Richweed 6) Stone root 7) Stoneroot 8) The eastern United States 1) Oxbalm 2) Richweed 3) Stoneroot 
• (n.) A composite plant (Erigeron Canadensis), which is a common weed.
Horse'weed` noun (Botany) A composite plant ( Erigeron Canadensis ), which is a common weed. 
[n] - common North American weed with linear leaves and small discoid heads of yellowish flowers
fleabane 3 Conyza canadensis noun common North American weed with linear leaves and small discoid heads of yellowish flowers; widely naturalized throughout temperate regions; sometimes placed in genus Erigeron
a North American composite weed, Erigeron canadensis, having narrow, hairy leaves and clusters of very small greenish-white flowers. · See · any of various other common weeds with small yellow flowers.