Page authors: Don Knoke, David Giblin
Gnaphalium uliginosum
marsh cudweed

Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to Oregon, east across the northern Rocky Mountains and northern Great Plains to eastern North America.

Habitat: Lake and pond margins, ephemeral pools, and other wet areas, sometimes where disturbed, at low to middle elevations.

Flowers: July-October

Origin: Introduced

Growth Duration: Annual

Conservation Status: Not of concern


Annual, usually much branched, 3-15 cm. tall, covered throughout with close, white, woolly hairs.


Leaves linear to linear-oblanceolate, entire, 1-3.5 mm. long and 2-10 mm. wide.


Heads in small, leafy-bracted, tight clusters, in the leaf axils and at the ends of the branches; involucre 3-3.5 mm. high, woolly below, the bracts dark brown or greenish with papery tips; corollas all tubular, the outer ones numerous, slender and pistillate, the few inner ones coarser and perfect, all whitish; receptacle naked; pappus of capillary bristles, distinct to the base.


Achenes small, nerveless.

Accepted Name:
Gnaphalium uliginosum L.
Publication: Sp. Pl. 2: 856. 1753.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Gnaphalium uliginosum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Gnaphalium uliginosum checklist entry.

E-Flora BC: Gnaphalium uliginosum atlas page.

CalPhotos: Gnaphalium uliginosum photos.

USDA Plants: Gnaphalium uliginosum information.

28 photographs:
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