Stems (10-)20-50(-90) cm; basal sheaths brown, often purplish-tinged, entire. Leaves (1·5-)3-6 mm wide, shorter than stems, glaucous beneath, dark green above, gradually acute at apex. Male spikes (1-)2-3(-4), 15-40 Χ 2-3 mm. Female spikes 1-5, 12-30(-60) Χ 3-7 mm, usually overlapping; lowest bract exceeding spike and usually inflorescence, not sheathing or with a sheath up to 3(-10) mm. Female glumes acute or acuminate, sometimes aristate, purplish-black to pale reddish-brown, 1-veined. Utricles 2-4 mm, broadly ellipsoid to obovoid, greenish-brown to purplish-black, papillose or hispidulous, with hairs less than 0·1 mm, rounded at apex and with a minute beak not more than 0·2 mm.
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