Soft, slender, the stems 1-4 dm, scattered on slender, branching rhizomes; lvs flat, 1-2 mm wide; spikes 2-5, sessile, separate or the upper approximate, 3-6 mm, with 1- (-6) perigynia and 1-3 terminal staminate fls; bract obsolete, or filiform and to 2 cm; scales triangular-ovate, stramineous to white-hyaline except the green midrib, equaling or more often shorter than the perigynia; perigynia ellipsoid, 2-3 mm, densely white-punctate, nearly round in cross-section, the margins appearing merely as 2 stronger nerves, the minute beak 0.2 mm; achene thick-lenticular, filling the perigynium, its style-base semipersistent as a slender apiculus; 2n=70. Bogs and wet woods, usually in shade; circumboreal, s. to Pa., Ind., Minn., Utah, and Calif.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.