Smartweed meaning

smärtwēd
Any of various plants of the genera Persicaria and Polygonum, having sheathlike stipules and small, densely clustered pink, white, or green flowers.
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Any of various knotgrasses (genus Polygonum) whose acrid juice may cause skin irritation.
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Any of more than a dozen species of the genus Polygonum.
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Origin of smartweed