Page authors: Don Knoke, David Giblin
Symphyotrichum hallii
Hall's aster

Distribution: Occurring west of the Cascades crest in Washington; Washington to Oregon.

Habitat: Dry, open places in the valleys and plains.

Flowers: July-October

Origin: Native

Growth Duration: Perennial

Conservation Status: Threatened in Washington (WANHP)


Fibrous-rooted perennial from a rhizome or branched base, the stems 2-10 dm. tall, pubescent at least above.


Lower leaves linear, petiolate, entire, pubescent, early-deciduous; middle and upper leaves linear, sessile, entire, usually pubescent, 2-10 cm. long.


Heads few to many in an open inflorescence, with numerous spreading, obtuse bracts 2-4 times as long as wide below the heads; involucre 4-6 mm. high, the bracts imbricate, papery below and green above, the outer rounded, the inner pointed; disk flowers numerous, yellow; ray flowers 15-35, pistillate, white, 5-13 mm. long; pappus of numerous capillary bristles.


Fruit an achene.

Accepted Name:
Symphyotrichum hallii (A. Gray) G.L. Nesom
Publication: Phytologia. 77: 283. 1995.

Synonyms & Misapplications:
Aster chilensis Nees ssp. hallii (A. Gray) Cronquist [HC]
Aster hallii A. Gray
Additional Resources:

PNW Herbaria: Specimen records of Symphyotrichum hallii in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Symphyotrichum hallii checklist entry.

E-Flora BC: Symphyotrichum hallii atlas page.

CalPhotos: Symphyotrichum hallii photos.

USDA Plants: Symphyotrichum hallii information.

22 photographs:
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