Page authors: Don Knoke, David Giblin
Polygonum austiniae
Austin's knotweed

Distribution: Central Oregon to northeast California, east to Idaho and southcentral Montana.

Habitat: Dry to moist banks and flats, from sagebrush plains to lower mountains, often with ponderosa pine.

Flowers: June - August

Origin: Native

Growth Duration: Annual

Conservation Status: Threatened in Washington (WANHP)

Identification Notes:

Achene 3-angled, black, smooth, shining, 2.5 mm. long, ovate in outline but tapered at both ends.

Accepted Name:
Polygonum austiniae Greene
Publication: Bull. Calif. Acad. Sci. 1: 212. 1885. (as austinae). 1885.

Synonyms & Misapplications:
Polygonum douglasii Greene ssp. austiniae (Greene) E. Murray [JPM, ILBC4]
Polygonum douglasii Greene var. austiniae (Greene) M.E. Jones
Additional Resources:

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

WA Flora Checklist: Polygonum austiniae checklist entry.

E-Flora BC: Polygonum austiniae atlas page.

CalPhotos: Polygonum austiniae photos.

USDA Plants: Polygonum austiniae information.

13 photographs:
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