1. (noun) 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
Synonyms: stone root, richweed, fleabane, horse balm, dead nettle, clearweed, stoneroot, horseweed, stone-root
2. (noun) richweed, clearweed, dead nettle, Pilea pumilla
a plants of the genus Pilea having drooping green flower clusters and smooth translucent stems and leaves
Synonyms: stone root, richweed, horse balm, stoneroot, dead nettle, hedge nettle, clearweed, hemp nettle, horseweed, stone-root
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Synonyms for richweed 
