any of several weeds of the genus Polygonum, having a smarting, acrid juice.

1780–90; smart + weed1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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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