Slender open clumps; rhizome short. Stems 50-70-(80) cm × 1-2.5 mm, ± rigid, yellow-green, finely ridged, ± shining, pith interrupted by small ± regular cavities. Basal sheaths shining brown at base, straw-coloured above. Inflorescence 3-13 cm long, often with 1 or 2 long branches. Flowers numerous, usually ± secund on the branchlets and rather closely packed in a central fan-shaped cluster with smaller fans at tips of long branches. Tepals 2-2.5 mm long, ± equal, acute. Stamens 3. Capsule 2.5-3 mm long, ± = tepals, ovate-oblong, light brown, obtuse at top.