Plants cespitose or not. Culms acutely angled, 10–50 cm, scabrous. Leaves: sheaths of proximal leaves glabrous, fronts lacking spots and veins, apex concave; blades 1.5–4 mm wide. Inflorescences: proximal bract setaceous or foliaceous, shorter than inflorescence, 0.5–3 mm wide. Spikes erect; proximal (1–)2–3 spikes pistillate, 0.7–3 cm × 3–4 mm, base cuneate or attenuate; terminal 1(–2) spikes staminate. Pistillate scales black, equaling or shorter than perigynia, apex obtuse or acute, awnless. Perigynia ascending, green, spotted purple-black or mottled on apical 1/2, veinless, somewhat flattened, tightly enclosing the achenes, ellipsoid, 1.5–3.5 × 0.9–2 mm, dull, apex rounded or acute, papillose; stipe to 0.45 mm; beak 0–0.2(–1) mm. Achenes not constricted, dull.
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