Colonial by slender rhizomes; stems 1.5–4 dm; lvs very slender, involute, mostly shorter than the stems; infl of 1–3 turbinate or ovoid glomerules 10–15 × 5–12 mm, the lower on exsert peduncles, each subtended and much surpassed by an erect foliaceous bract; spikelets 4–6 mm, dark brown, with 2–3 fls and frs; bristles antrorsely barbellate, 3 about equaling the tubercle, 2 or 3 about equaling the achene; achenes obovate or triangular-obovate to pyriform, 1.1–1.4 mm, three-fourths as wide, light brown, smooth at 10×, tubercle flat-subulate, 0.7–1.5 mm; 2n=26, 32. Bogs and marshes; Nf. and Que. to Sask., s. to Del., Md., N.Y., Mich., and Minn.; also in Europe.
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