"horseweeds" in the noun sense
1. horse balm, horseweed, stoneroot, stone-root, richweed, stone root, Collinsonia canadensis
erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers the eastern United States
2. horseweed, Canadian fleabane, fleabane, Conyza canadensis, Erigeron canadensis
common North American weed with linear leaves and small discoid heads of yellowish flowers widely naturalized throughout temperate regions sometimes placed in genus Erigeron
Source: WordNet® (An amazing lexical database of English)
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