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Polygonum (Knotweed) is a genus of herb in the family Polygonaceae. They are native to Saint-Pierre Et Miquelon, Canada, Alaska, Pacific Basin excluding Hawaii, North America, The Contiguous United States, Greenland, and Puerto Rico.

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EOL has data for 5 attributes, including:

Known occurrences, collected specimens and observations of knotweed. View this species on GBIF