Plants densely cespitose. Culms 10–83 cm × 0.8–1.3 mm, papillose at mid height. Leaves: ligule of distal leaf (2.1–)2.6–6.8 mm; blades 1.4–3.8 mm wide, widest blade 2.3–3.8 mm wide. Inflorescences 27–68 mm, proximalmost 2 spikes overalapping or separate; proximal internode 7.3–28 mm; proximal bract 11–61 mm; spikes (4–)5–6(–7), usually gynecandrous, sometimes pistillate or staminate; proximal spike usually with 1–3 staminate and 11–22 pistillate flowers, longest per plant with 12–22 pistillate flowers, 9.7–18 × 3.7–6.6 mm, longest per plant 12–18 mm; terminal spike usually with 1–3 staminate and 14–21 pistillate flowers, sessile or on peduncle to 1.8 mm, 9.6–16 × 3.4–6.2 mm. Pistillate scales whitish to castaneous, with green midrib, 2.9–4.4 mm, body 2.9–3.8 × 1.4–1.8 mm, apex acuminate to short-awned, awn to 1.1 mm. Staminate scales with whitish to castaneous margins, 3.1–4.3 × 1–1.5 mm, apex acute to short-awned. Anthers 1.3–1.8 mm. Perigynia erect to appressed-erect, green to brown, veinless or weakly 1–3(–4)-veined abaxially, veinless adaxially, narrowly lanceolate in outline, 3.7–5.3 × 1.1–1.3(–1.4) mm, 3.2–3.9(–4.2) times as long as wide, apex gradually tapering; beak 1.5–2.2 mm, 39–49% of total perigynium, margins denticulate for distal 49–60% of length of perigynium, apex entire or bidentulate, teeth 0–0.2(–0.4) mm, 0–8% of length of perigynium. Stigmas 1.8–2.5 mm. Achenes 1.6–2.2 × 1.1–1.3 mm, 1.5–1.8 times as long as wide.
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