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
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.