Polygonum douglasii
Douglas' Knotweed, Douglas's Knotweed
Also known as: Polygonella douglasi Author +16 more
- Polygonella douglasi Author
- Polygonum buxiforme f. montanum Brenckle
- Polygonum buxiforme var. montanum (Brenckle) R.J.Davis
- Polygonum commixtum Greene
- Polygonum crassum var. angustifolium Lojac.
- Polygonum crassum var. magnum Lojac.
- Polygonum douglasii subsp. douglasii
- Polygonum douglasii var. douglasii
- Polygonum douglasii var. latifolium (Engelm.) Greene
- Polygonum douglasii var. montanum Small
- Polygonum howellii Greene
- Polygonum montanum (Small) Greene
- Polygonum montanum Small
- Polygonum pannosum S.S.Sharp ex A.Nelson
- Polygonum tenue var. commune Engelm.
- Polygonum tenue var. latifolium Engelm.
- Polygonum vagans Greene
Botanical Data
- Taxonomic Rank: Species
- Botanical Family: Polygonaceae
- WCVP Morphological Data: Recorded natively as a annual.
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Polygonum douglasii (commonly known as Douglas' Knotweed or Douglas's Knotweed) is an annual within the Polygonaceae family. It is found natively in North America. In its natural range, this species typically occurs in temperate conditions.
Macro Climate
Temperate
Plant Type
Annual
Native Range
Continents (WGSRPD)
NORTHERN AMERICA
Regions (WGSRPD)
Eastern Canada, Mexico, North-Central U.S.A., Northeastern U.S.A., Northwestern U.S.A., South-Central U.S.A., Southeastern U.S.A., Southwestern U.S.A., Subarctic America, Western Canada
Botanical Countries (WGSRPD L3)
Alberta, Arizona, British Columbia, California, Colorado, Idaho, Iowa, Manitoba, Mexico Northwest, Michigan, Minnesota, Montana, Nebraska, Nevada, New Brunswick, New Hampshire, New Mexico, New York, Ontario, Oregon, Québec, Saskatchewan, South Dakota, Utah, Vermont, Virginia, Washington, Wyoming, Yukon
Introduced Range
Plants flagged as 'Introduced' have been transported outside their native historical range by human activity. While many are common ornamentals, some may become naturalized or invasive in local environments. Local ecological guidelines require verification prior to planting.
Botanical Countries (Non-Native)
Maryland