Perennials, usually 40–90 cm tall, densely caespitose; rhizome very short-noded. Stem leafless, terete, 0.8–1.4 (–1.6) mm in diam., smooth, green and shiny when fresh, blue-green and striate when dry; ridges c. 30–40, low, flat; subepidermal sclerenchyma strands 5–25; pith continuous, of astericiform cells. Cataphylls 3–4; upper cataphylls mostly (3–) 5–11 (–14) cm long, pale brownish castaneous at base, green above, drying to pale brown; sheaths dull, thin and membranous, tight, not papillose; sheath apex symmetrical, obtuse or rounded, slightly thickened, darkened, and inrolled, narrowly bordered with thin margin. Lower bract 4.3–21 cm long, exceeding the inflorescence, with sheath moderately widened; lower middle bract 2–7 mm long, with a ±narrow membranous margin and reduced c. 0.3–4 mm blade. Inflorescence usually diffuse, fastigiate, c. 1–7 cm long, 0.6–4 cm wide. Tepals subequal, lanceolate, acuminate to apiculate, soft, ±erect-spreading, with a greenish midrib bordered by medium (to dark) brown bands and a narrow scarious margin; outer tepals 1.8–3.0 mm long; inner tepals 1.5–2.3 mm long. Stamens 3; anthers 0.7–0.8 mm long, about equalling filaments; style 0.1–0.3 mm long. Capsule unilocular, trigonous obovoid, 2.2–3 mm long, ±shorter than or equalling tepals, pale olive-brown, rarely dark brown; mucro short or absent. Seeds 0.4–0.6 mm long, obliquely obovoid, reticulate, with pale apex; appendages absent.