WordNet sense 1 (erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers; the eastern United States):

horseweed, stoneroot, stone-root, horse balm, Collinsonia canadensis, stone root

WordNet sense 2 (a plants of the genus Pilea having drooping green flower clusters and smooth translucent stems and leaves):

clearweed, dead nettle, Pilea pumilla