Culms 5–40 cm. Leaves: blades 5–15(–25) cm × 1–2.5(–3.5) mm. Inflorescences: proximal bracts leaflike, exceeding inflorescences, sheaths to 10 mm; lateral spikes with 9–30 perigynia, approximate or proximal distant, dense, 7–15 × 3–5 mm; middle internodes 0.3–0.7 mm; terminal spike usually gynecandrous, with at least 1/3 of flowers staminate, rarely entirely staminate, sessile or short-pedunculate, 6–15(–20) mm, (1.2–)1.5–2.5 mm wide in staminate portion. Pistillate scales ascending, medium to dark brown with paler midvein and hyaline margins, ovate-circular, 1.7–2.7 × 1–1.9 mm, apex obtuse to acute, sometimes shortly mucronate. Staminate scales brown with paler midvein and hyaline margins, oblong-ovate, (2–)2.5–3.7 mm, apex obtuse to acute. Perigynia ascending, white, elliptic-obovate, 2–3 × 1.2–1.8 mm, densely papillose. Achenes elliptic-circular, 1.4–2 × 1–1.5 mm.
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