Page authors: Don Knoke, David Giblin
Agoseris heterophylla
annual agoseris

Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to Idaho, Montana, Utah, and Arizona.

Habitat: Dry, open areas at low to mid-elevations.

Flowers: April-July

Origin: Native

Growth Duration: Annual

Conservation Status: Not of concern

Pollination: Bees, flies, beetles


Scapose, slender annual, usually glabrous, often with several scapes from the base, 3-40 cm. tall, with milky juice.


Leaves oblanceolate, toothed or pinnatifid to entire, up to 15 cm. long and 1.5 cm. wide, mostly basal, but a few on the base of the stem.


Heads solitary, small; involucre 5-13 mm. high in flower, elongating in fruit, with a few soft hairs; corollas all ligulate, yellow.


Achene body 2-5 mm. long, prominently ribbed or winged, tapering to a slender beak 2-3 times as long.

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

Synonyms & Misapplications:
Agoseris heterophylla (Nutt.) Greene ssp. heterophylla
Additional Resources:

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

WA Flora Checklist: Agoseris heterophylla checklist entry.

OregonFlora: Agoseris heterophylla information.

E-Flora BC: Agoseris heterophylla atlas page.

CalPhotos: Agoseris heterophylla photos.

USDA Plants: Agoseris heterophylla information.

64 photographs:
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