Perennial, more than 1 m; rhizome with short stolons. Stem 4-6 mm in diam., sharply trigonous, sides concave above. Leaves reduced; sheaths few, up to more than 30 cm, grey-brown or reddish, lowest bladeless; ligule 0 (?); blades 1-3, short, up to c.10 mm wide, flat, margins smooth, apex acute, smooth or scabrous. Inflorescence simple anthelodium, up to more than 10 cm diam., usually wider than long; bracts 3-4, longer than inflorescence; primary branches up to 7 cm, spreading, tubular prophylls up to c.8 mm; cluster of spikes with usually more than 15 spikes, in almost spherical group, lowest often almost digitately pedunculate. Spikes 10-25 x 1.5-2 mm, with 10-40 glumes, glume-like bract c. 1 mm, acute, glume-like prophyll bi-nerved, blunt, base spongy; rachis almost straight, quadrangular with sharp, narrowly winged angles; glumes c.2.2 mm, cymbiform when fresh, almost flat, inwards curved when dry, blunt, reddish-brown, mid-nerve not prominent, margins scarious, grey-yellow. Anthers c.1 mm. Nut c.1.8 x 0.5 mm, trigonous, slightly compressed, dark brown, glossy, very finely reticulate.