Perennials, 50–150 cm tall, densely caespitose; rhizome very short-noded. Stem leafless, terete, (1.5–) 2–3 (–4) mm thick, green; smooth to inconspicuously ridged; ridges 40–70, when fresh inconspicuous, when dry low; subepidermal sclerenchyma strands present, most connected by radial lamellae to small and medium-sized vascular bundles; epidermis cells uniform; bundles in 2 (–3) rows; pith continuous, of astericiform cells, remaining in mature stems. Cataphylls 3(–4). Upper cataphylls (4–) 10–15 (–20) cm long, usually light reddish-brown; uppermost cataphylls with tiny blade. Inflorescence pseudolateral, diffuse or rarely dense, of 50–120 (–many) separate flowers. Lower bract usually several times longer than inflorescence; sheath narrow, with membranous margin 0.5 mm wide, ±constricted below inflorescence; bracteoles 0.5–1.5 mm long, often unequal, ovate, acute, membranous. Tepals 1.5–3 mm long, with outer ones longest, lanceolate, apiculate, green to light brown with scarious margin. Stamens 3 (–6); anthers 0.4–0.7 mm long, slightly shorter than filaments. Style very short; stigmas 0.6–1 mm long. Capsule (1.6–) 2–2.5 mm long, subequal to or slightly exceeding perianth, subspheroid to ovoid, broadly ellipsoid or obovate, obtuse or slightly retuse, not or shortly mucronate, unilocular, triseptate, light brown. Seeds 0.5 × 0.2–0.3 mm, obliquely ovoid, reticulate, without appendages.