Page author: Don Knoke
Eriophorum angustifolium
many-spiked bog cotton, many-spiked cotton-grass

Distribution: Circumboreal at high latitudes, extending south into Oregon, Colorado and New York.

Habitat: Cold swamps and bogs at moderate to high elevations in the mountains.

Flowers: July - August

Origin: Native

Conservation Status: Not of concern


Herbaceous perennial from extensive creeping rhizomes, the culms sub-terete, 2-6 dm. tall.


Leaves basal and cauline, the blade elongate, 2-6 mm. wide, flat, becoming channeled near the tip; sheaths closed; uppermost culm leaf with blade equaling the sheath.


Spikelets 2-8 in a terminal inflorescence, pedunculate in an umbel, the peduncles compressed, smooth; umbel subtended by several unequal involucral bracts, 2 or more of them foliaceous above the papery base; scales subtending the flowers scarious, tawny to brownish; perianth consisting of numerous, white, capillary bristles 2-4 cm. long; stamens 3; style trifid.


Achenes blackish, 2-3 mm. long, obovate.

Accepted Name:
Eriophorum angustifolium Honck.
Publication: Verz. Gew. Teutschl. 153. 1782.

Synonyms & Misapplications:
(none provided)
ssp. angustifolium – many-spiked cottongrass
Additional Resources:

PNW Herbaria: Specimen records of Eriophorum angustifolium in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Eriophorum angustifolium checklist entry.

E-Flora BC: Eriophorum angustifolium atlas page.

CalPhotos: Eriophorum angustifolium photos.

USDA Plants: Eriophorum angustifolium information.

28 photographs:
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