Perennials, (25–) 40–140 cm tall, often forming extensive stands; rhizome up to 6 mm thick, tough, with nodes 5–10 mm long, some branches short with dense groups of stems. Stem leafless, ±soft, terete to slightly compressed, c. 1–3 mm thick, smooth (ridges inconspicuous or lacking); subepidermal sclerenchyma strands lacking; vascular bundles in two rows, separated by a row of tubes; pith a network of cells with ±irregular processes, cobwebby and evanescent in mature stems. Cataphylls 3–4; upper cataphylls 5–12 cm long, ±conspicuously lax, light stramineous to light reddish-brown, usually shining. Lower bract (3–) 5–15 (–25) cm long, much exceeding the inflorescence. Inflorescence pseudolateral, c. (1–) 1.5–5 cm, of (1–) 2–5 clusters; flowers usually (10–) 30–60 (–100), in one large subsessile cluster and 1–4 pedunculate ones; peduncles stout, erect, 0.3–3 (–4.5) cm long, to c. 1 mm thick. Bracteoles broadly ovate, obtuse to acute, 2–3 mm long, brownish castaneous at base, distally membranous. Outer tepals 5–8 mm long, usually exceeding inner (to 6.5 mm long), all lanceolate, apiculate or inner acute, brown with green central band; margin membranous above, broader in the inner. Stamens 6; anthers (0.9–) 1.5–2.3 mm long; filaments 0.2–0.6 (–0.9) mm long; style 1.0–1.2 mm long; stigmas 2–3 mm long. Capsule 4–7 mm long, shorter than or subequal to tepals, obovoid to narrowly ovoid, acute, dark brown, trilocular, with mucro c. 0.3–0.4 mm long. Seeds 0.6–0.7 × 0.3–0.4 mm, obovoid to ellipsoid, dark amber, indistinctly reticulate; appendages absent.