Culms in medium-to large-sized clumps, 30–90 cm. Leaves cauline, usually overtopping culms; blades 10–40(–50) cm × 4–9 mm. Inflorescences with proximal spikes ± strongly separate on slender peduncles, others approximate and short-pedunculate or subsessile, narrowly oblong to cylindric, 1–4 cm × 3.5–5.6 mm; lateral spikes, if gynecandrous, with ca. 30–140 pistillate flowers distally and (0–)1–10 staminate flowers proximally; terminal spikes staminate proximally, 1/2–3/4 pistillate distally. Pistillate scales ovate, 1.5–3.2 mm, mostly not quite as long as perigynia. Perigynia olive green to brown, very broadly compressed-obovoid, sharply edged, 2–2.6 × 1.8–2.4 mm; beak often projecting out at 90° angle. Achenes widely oblong-obovoid, 1.5–1.8 × 1–1.3 mm, apex short-apiculate.
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