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Anastasia Davydova   cc-by-nc-4.0

Polygonum bellardii (Narrowleaf Knotweed) is a species of annual herb in the family Polygonaceae. They are native to Canada.

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EOL has data for 13 attributes, including:

Known occurrences, collected specimens and observations of narrowleaf knotweed from the Global Biodiversity Information Facility   GBIF provides free and open access to biodiversity data. View this species on GBIF