Native Plants
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Polygonum douglasii ssp. majus
Polygonum douglasii Greene ssp. majus (Meisn.) J.C. Hickman
Large Douglas' Knotweed, Large Knotweed, Wiry Knotweed
Polygonaceae (Buckwheat family)
Synonym(s): Polygonum coarctatum var. majus, Polygonum majus
USDA Symbol: PODOM2
USDA Native Status: L48 (N), CAN (N)
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Plant Characteristics
Duration: AnnualHabit: Herb
Fruit Type: Achene
Size Notes: Up to about 2 feet tall.
Bloom Information
Bloom Color: White , PinkBloom Time: May , Jun , Jul , Aug , Sep
Distribution
USA: CA , ID , MT , NV , OR , WA , WYCanada: BC
Native Habitat: Dry plains, meadows, sometimes on serpentine.
National Wetland Indicator Status
Region: | AGCP | AK | AW | CB | EMP | GP | HI | MW | NCNE | WMVE |
Status: | FACU | FACU |
Web Reference
Webref 30 - Calflora (2018) CalfloraWebref 3 - Flora of North America (2014) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter
Additional resources
USDA: Find Polygonum douglasii ssp. majus in USDA PlantsFNA: Find Polygonum douglasii ssp. majus in the Flora of North America (if available)
Google: Search Google for Polygonum douglasii ssp. majus
Metadata
Record Modified: 2020-11-12Research By: CBR