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Loosely rhizomatous; fertile stems 1–2.5 dm, scabrous-puberulent above; lvs mostly basal, thick and stiff, 1–2 dm × 1.5–2.5 mm; terminal spike staminate, linear, 12–20 mm, its scales rounded or blunt, with narrow purple center and broad hyaline margins; anthers 2–3.5 mm; pistillate spikes 2(3), erect, approximate or slightly separate, short-peduncled, 1–2 cm, their scales ± acute, wider than and equaling or more often surpassing the perigynia, brown-purple with hyaline margins, perigynia 10–25, obovoid, 2.5–3.5 mm, roundly angled on the back, keeled on the lateral angles, thinly pubescent; basal spikes none; achene sharply trigonous; 2n=52. Dry or rocky upland woods; Vt. to Alta., s. to D.C., O., Ind., Io. and S.D.; rare and local in the east. Fl early, fr May.
