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

Distribution: Occurring chiefly east of the Cascades crest in Washington, where widely distributed; British Columbia to California, east to the Great Plains and Great Lakes region.

Habitat: Meadows and seasonally moist open areas from low elevations to the subalpine.

Flowers: May-August

Origin: Native

Growth Duration: Perennial

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, lambs-tongue groundsel, tall western groundsel    Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
var. ochroleucus – white western groundsel    Occurring chiefly east of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to California, east to Montana.
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.

149 photographs:
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