Plants loosely cespitose or colonial. Culms erect, straight, bluntly trigonous, 8–40 cm, smooth to slightly scabrous-angled distally. Leaves: basal sheaths dark brown; ligules 0.4–1.7 mm; blades flat, shorter than culms, (1.5–)2–3.5(–4) mm wide. Inflorescences 0.8–1.6 cm; spikes ca. 5–15, indistinguishable in dense, globose to ovoid head. Pistillate scales reddish brown to blackish, ± translucent, lacking whitish hyaline margins, ovate, ± equaling perigynia, apex acute to acuminate, body shiny. Anthers 1.5–2.8 mm. Perigynia pale yellowish brown proximally, reddish brown to blackish distally and on beak, finely 5–9-veined abaxially, faintly veined or essentially veinless adaxially, flattened, not inflated, narrowly to broadly elliptic, 3.3–4.6 × 1.1–1.9 mm, membranous, shiny; stipe 0.2–0.6 mm; beak well defined, 0.9–1.5 mm, smooth-margined.
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