Page author: David Giblin
Agoseris grandiflora
large-flowered agoseris
WTU specimens
Other herbaria

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

Habitat: Meadows and other open places in the lowlands and at moderate elevations in the mountains, often in dry areas.

Flowers: May-August

Origin: Native

Conservation Status: Not of concern


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.
var. grandiflora – large-flowered agoseris
var. leptophylla – large-flowered agoseris
Additional Resources:

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

WA Flora Checklist: Agoseris grandiflora checklist entry.

E-Flora BC: Agoseris grandiflora atlas page.

CalPhotos: Agoseris grandiflora photos.

USDA Plants: Agoseris grandiflora information.

62 photographs:
Group by