Plants cespitose. Culms 5–20(–50) cm, smooth or rough distally. Leaves: cauline leaves 0–1, distal leaf usually proximal to mid culm, bladeless or with short blade; blade forming angle with sheath, filiform or trigonous-channeled, 0.4–1.2 mm wide. Inflorescences: involucral bracts absent or present as short blade on distal leaf. Spikelets solitary, erect, globose in fruit, 10–20 mm in flower, 15–30 mm in fruit; scales pale blackish brown, margins and tip hyaline, ovate-lanceolate, thin; proximal empty scales mostly 10–15, appressed to ascending, ovate, 5–8 mm, ribs ± to margins, midrib not reaching tip, apex acute. Flowers: perianth bristles white to very pale brown; anthers 0.6–1.2 mm. Achenes ellipsoid-obovoid, 1.8–2.1 mm. 2n = 60.
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