Page author: David Giblin
Polygonum californicum
California knotweed

Distribution: Occurring in the east end of the Columbia River Gorge in Washington; south-central Washington to California.

Habitat: Dry rocky slopes, gravelly ground at low elevations.

Flowers: May-July

Origin: Native

Growth Duration: Annual

Conservation Status: Review Group 1 in Washington (WANHP)


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Accepted Name:
Polygonum californicum Meisn.
Publication: Prodr. 14: 100. 1856.

Synonyms & Misapplications:
Duravia californica (Meisn.) Greene
Polygonum greenii S. Watson
Additional Resources:

PNW Herbaria: Specimen records of Polygonum californicum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Polygonum californicum checklist entry.

E-Flora BC: Polygonum californicum atlas page.

CalPhotos: Polygonum californicum photos.

USDA Plants: Polygonum californicum information.

5 photographs:
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