smartweed

[smahrt-weed]
noun
any of several weeds of the genus Polygonum, having a smarting, acrid juice.

Origin:
1780–90; smart + weed1

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Too many others can justifiably go by the clan's common names, knotweed or smartweed.
The marshes are drained in spring and summer to promote growth of vegetation such as wild millet, sedges, and smartweed.
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