Page authors: Don Knoke, David Giblin
Senecio integerrimus
one-stemmed butterweed, western groundsel
WTU specimens
Other herbaria

Distribution: Widely distributed throughout most of Washington; British Columbia south to California, east to the central regions of Canada and the U.S.

Habitat: Open areas from the valleys to near timberline.

Flowers: May-July

Origin: Native

Conservation Status: Not of concern


Stout, fibrous-rooted perennial from a very short crown; stems solitary, 2-7 dm. tall; plants covered with white, loose hairs when young, but these missing in older plants except in the leaf axils.


Usually entire, elliptic to broadly lanceolate, the basal ones petiolate, the blade and petiole 6-25 cm. long and 1-6 cm wide; cauline leaves progressively reduced upward, becoming sessile toward the top of the stem.


Heads several to numerous in a rather congested inflorescence; involucre 5-10 mm. long; rays 6-15 mm. long, usually yellow, occasionally cream.

Identification Notes:

A Senecio growing on dry ground, with a fairly tall, single, upright stem and large, entire leaves is probably this species, especially if the leaves are lightly covered with white, tangled hairs.

Accepted Name:
Senecio integerrimus Nutt.
Publication: Gen. N. Amer. Pl. 2: 165. 1818.

Synonyms & Misapplications:
(none provided)
var. exaltatus – one-stemmed butterweed, western groundsel    Common east of the Cascade crest in Washington and Oregon, to Colorado
var. ochroleucus – one-stemmed butterweed, western groundsel    Uncommon east of the Cascade crest in Washington and Oregon, to Montana and northern California
Additional Resources:

PNW Herbaria: Specimen records of Senecio integerrimus in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Senecio integerrimus checklist entry.

E-Flora BC: Senecio integerrimus atlas page.

CalPhotos: Senecio integerrimus photos.

USDA Plants: Senecio integerrimus information.

108 photographs:
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