richweed

n.

(Bot.) An herb (Pilea pumila) of the Nettle family, having a smooth, juicy, pellucid stem; -- called also clearweed.

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IN BRIEF: n. - A plants of the genus Pilea having drooping green flower clusters and smooth translucent stems and leaves; Erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers.

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The noun has 2 meanings:

Meaning #1: erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers; the eastern United States
  Synonyms: horse balm, horseweed, stoneroot, stone root, Collinsonia canadensis

Meaning #2: a plants of the genus Pilea having drooping green flower clusters and smooth translucent stems and leaves
  Synonyms: clearweed, dead nettle, Pilea pumilla

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