Page authors: Don Knoke, David Giblin
Tetradymia canescens
gray horsebrush, spineless horsebrush

Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to California, east to the Rocky Mountains.

Habitat: Dry, open places in sagebrush.

Flowers: June-September

Origin: Native

Conservation Status: Not of concern


Unarmed, much-branched shrubs, 2-6 dm. tall, closely grey-woolly throughout.


Primary leaves linear to oblanceolate, entire, 1-3 cm. long, often with shorter and broader leaves in the primary leaf axils.


Heads in small, flat-topped clusters terminating the numerous branches; involucre 7-10 mm. high, cylindric, the bracts 4-5, erect and equal; corollas 4 in each head, yellow, all tubular, the lobes longer than the throat; pappus of numerous whitish, capillary bristles.


Achenes terete, usually densely hairy.

Accepted Name:
Tetradymia canescens DC.
Publication: Prodr. 6: 440. 1838.

Synonyms & Misapplications:
Tetradymia inermis Nutt.
Additional Resources:

PNW Herbaria: Specimen records of Tetradymia canescens in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Tetradymia canescens checklist entry.

E-Flora BC: Tetradymia canescens atlas page.

CalPhotos: Tetradymia canescens photos.

USDA Plants: Tetradymia canescens information.

20 photographs:
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