Stems ±crowded along stout rhizome, 40–150 cm tall, 1.5–2.7 (–3.5) mm in diam.; ridges 37–55, distinct. Cataphylls 7–14 cm long, abaxially yellow-brown distally, light to dark castaneous-brown towards the base, dull; upper cataphylls loose, adaxially stramineous to yellow-brown, dull to slightly glossy; blade acicular, to 5 mm long; cortical air-spaces of stem absent, few or small. Lower bract 3–10 cm long, shorter than to exceeding inflorescence; sheath narrow. Bracteoles ovate, c. 1 mm long, membranous to scarious. Tepals 1.5–2.2 (–2.6) mm long, acute, with inner ones sometimes subacute; margins broad, membranous. Anthers c. 0.5 mm long; filaments c. 0.5 mm long; style c. 0.1 mm long. Capsule triseptate, obovoid, ±obtuse, slightly exceeding or equalling perianth, occasionally red-brown at apex. Seeds 0.5–0.6 × 0.2–0.3 mm, c. 15–20-striate, densely transversely reticulate; appendages absent.