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Image of <i>Polygonum douglasii</i> ssp. <i>johnstonii</i>
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Douglas' Knotweed

Polygonum douglasii Greene

2009 Barry Breckling   cc-by-nc-sa-3.0

Polygonum douglasii (Douglas' Knotweed) is a species of annual herb in the family Polygonaceae. They are native to The Contiguous United States and Canada.

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EOL has data for 10 attributes, including:

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