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San Diego Natural History Museum. SDNHM. Year: 2015.   cc-by-nc-sa-3.0

Polygonum douglasii (Douglas' knotweed) is a species of annual herb in the family Polygonaceae. It has a self-supporting growth form. It is native to Canada and the contiguous United States. It has simple, broad leaves. It is a photoautotroph. Individuals can grow to 0.11 m.

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EOL has data for 19 attributes, including:

Known occurrences, collected specimens and observations of Douglas' knotweed