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Rhizome creeping, slender, c. 1 mm thick, clothed with brown sheathing scales. Stems erect or curved, trigonous, smooth, or scaberulous below the inflorescence, 7-15 cm by c. 0.5 mm. Leaves subbasal, shorter than the stems, rigid, curved, circinnate at the apex, canaliculate to convolute, smooth or scaberulous towards the apex, c. 1 mm wide. Spikelets 4-7, androgynous (male part about as long as the female), sessile, approximate, elliptic-lanceolate (very young), subdense-flowered, 5-7 mm long, forming a more or less oblong head 1-1.5 by c. 0.5 cm. Bracts glumiform, the lower long-awned. Glumes oblong-lanceolate or ovate-lanceolate, acutish, very thin, translucent, castaneous with broad whitish-hyaline margins, 3.5-4 mm long, the midrib not extending to the apex to very shortly excurrent. Utricles (very immature) elliptic, plano-convex, nerveless, glabrous, scabrid on the margins in the upper half, 3-4 by c. 1 mm, tapering above into a short beak with oblique mouth. Stigmas 2, about as long as the utricle.
Rhizomes 0.6–1.8 mm thick, shoots often arising 2–several per cluster, many nodes without shoots. Culms bluntly trigonous, (6–)10–35 cm, smooth-angled distally. Leaves: basal sheaths grayish brown to dark brown, shredding into fibers; sheaths with hyaline inner band, apex not prolonged beyond base of blade; ligules 0–0.8 mm, glabrous; blades 0.6–1.8 mm wide. Inflorescences 0.7–2 cm, 1/2+ as wide as long (if pistillate); spikes 3–8, androgynous, ovoid. Pistillate scales dark reddish brown, with hyaline margins, broadly ovate, 2.4–4.1 mm, apex acute to acuminate, shiny. Anthers 1.4–3 mm, apiculus smooth to warty, very short and broad (30X). Perigynia dark reddish brown, essentially veinless, ± stipitate, broadly ovate to nearly orbicular, thickly plano-convex, 2.4–3.9 × 1.5–2.1 mm, shiny; beak 0.3–0.9 mm, hyaline, weakly bidentulate or oblique.
