Page authors: Ben Legler, David Giblin
Senecio hydrophiloides
sweet marsh butterweed, stout meadow groundsel

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

Habitat: Wet meadows in the mountains and foothills, but not in alkali.

Flowers: May-July

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Bumblebees, bees, butterflies, flies, beetles


Glabrous but scarcely glaucous, fibrous-rooted perennial from a short crown, 3-10 dm. tall, the stems solitary or more commonly clustered.


Somewhat succulent, sharply dentate, the basal and lowermost cauline ones petiolate, with elliptic or broadly oblanceolate blades 6-25 cm. long and 2-7 cm. wide; upper leaves few, strongly reduced, becoming sessile toward the upper stem.


Heads fairly numerous in a congested inflorescence; involucre 6-9 mm. high, the bracts often black-tipped; rays typically about 5, up to about 8 mm. long, frequently wanting.

Accepted Name:
Senecio hydrophiloides Rydb.
Publication: Mem. New York Bot. Gard. 1: 441. 1900.

Synonyms & Misapplications:
Senecio foetidus Howell [HC]
Senecio foetidus Howell var. foetidus [HC]
Senecio foetidus Howell var. hydrophiloides (Rydb.) T.M. Barkley ex Cronquist [HC]
Senecio oreganus Howell
Additional Resources:

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

WA Flora Checklist: Senecio hydrophiloides checklist entry.

OregonFlora: Senecio hydrophiloides information.

E-Flora BC: Senecio hydrophiloides atlas page.

CalPhotos: Senecio hydrophiloides photos.

USDA Plants: Senecio hydrophiloides information.

40 photographs:
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