Plants cespitose. Culms terete or nearly so, 20–70 cm, smooth. Leaves: bladeless sheaths 1–3, evenly distributed on culm, distal to middle, not inflated distally, filiform, channeled, 0.4–1.2 mm wide. Inflorescences: involucral bracts absent. Spikelets solitary, erect, globose, 10–20 mm in flower, 20–35 mm in fruit; proximal empty scales usually 7 or more, ascending, blackish, ovate-lanceolate, 5–10 mm, thin, margins broad, ribless, midrib not reaching tip. Flowers: perianth bristles usually more than 8, creamy white to pale brown, 10–20 mm; anthers 0.5–2 mm. Achenes oblanceoloid, (1.8–)2–2.3(–2.7) × 0.5–1.2 mm; apex minutely apiculate, 0.1 mm. 2n = 58.
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