Distribution: British Columbia to California, esat to Idaho, Wyoming, Colorado, and New Mexico.
Habitat: Moist, usually saline soil, often along the shores of lakes and ponds, or in vernally moist, alkaline bottoms.
Growth Duration: Annual, Perennial
Conservation Status: Not of concern
Glabrous, branching annual, the stem 0.5-14 dm. tall.
Leaves alternate, linear and sessile to oblanceolate and short-petiolate, the blade up to 6 cm. long and 1 cm. wide.
Heads several in a paniculate inflorescence; involucre 5-9 mm. high, its bracts herbaceous, somewhat imbricate; pistillate ray flowers more numerous than the disk flowers, the rays pinkish, about 2 mm. long, erect and narrow, longer than the style, barely surpassing the disk flowers; capillary pappus soft and copious, longer than the disk flowers.
PNW Herbaria: Specimen records of Symphyotrichum frondosum in the Consortium of Pacific Northwest Herbaria database.
WA Flora Checklist: Symphyotrichum frondosum checklist entry.
OregonFlora: Symphyotrichum frondosum information.
E-Flora BC: Symphyotrichum frondosum atlas page.
CalPhotos: Symphyotrichum frondosum photos.
USDA Plants: Symphyotrichum frondosum information.