Page author: David Giblin
Agoseris grandiflora
large-flowered agoseris

Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Montana, Idaho and Nevada.

Habitat: Prairies, balds, meadows, and forest openings, often where seasonally dry, from low to middle elevations in the mountains.

Flowers: May-August

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Bees, flies, beetles


Scapose, stout perennial, 2-7 dm. tall, somewhat hairy when young, the juice milky.


Leaves all basal, oblanceolate to broadly linear, entire to deeply pinnatifid, 10-25 cm. long and 1-3 cm. wide.


Head solitary, large and many-flowered; involucre 1.5-4 cm. high, its outer bracts broad and short, the inner narrower and elongate; corollas all ligulate, yellow.


Achene body 4-7 mm. long, tapering to a slender beak 2-4 times as long.

Accepted Name:
Agoseris grandiflora (Nutt.) Greene
Publication: Pittonia. 2: 178. 1891.

Synonyms & Misapplications:
Stylopappus grandiflorus Nutt.
Additional Resources:

PNW Herbaria: Specimen records of Agoseris grandiflora in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Agoseris grandiflora checklist entry

OregonFlora: Agoseris grandiflora information

E-Flora BC: Agoseris grandiflora atlas page

CalPhotos: Agoseris grandiflora photos

76 photographs:
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