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Knotweed vs. Smartweed

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Knotweednoun

Any of several plants of the genus Polygonum, with jointed stems and inconspicuous flowers

Smartweednoun

Any of a number of plants in the genus Persicaria (formerly Polygonum).

Knotweednoun

See Knotgrass.

Smartweednoun

An acrid plant of the genus Polygonum (P. Hydropiper), which produces smarting if applied where the skin is tender.

Knotweed

Knotweed is a common name for plants in several genera in the family Polygonaceae.

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