Perennials, 25–45 (–60) cm tall, caespitose to loosely caespitose; rhizome ascending, branched; stolons numerous, ascending, with bases covered with brown to purplish castaneous-brown cataphylls. Basal leaves numerous, usually 15–22 cm long, 3–4.5 (–6) mm wide. Cauline leaves 1.5–3.5 (–8.0) cm long. All leaves subulate; margins ±smooth, ciliate to glabrescent, slightly swollen. Lower bract subherbaceous, erect, 1.2–2.5 cm long, much shorter than inflorescence. Inflorescence decompound, ±erect, usually 4–5 × 3–4 cm, dense, with each main branch bearing anthela of short pedunculate usually 2–6-flowered clusters. Bracteoles purplish membranous to pale grey, ±lanceolate, sparsely ciliate, 2.5–3.0 mm long. Tepals narrowly oblong-lanceolate, glabrous, ±unequal, with inner tepals often conspicuously longer, 4.4–5.0 mm long, purplish-coppery with hyaline margin, later becoming greyish pale brown; midrib often pale. Stamens 6; anthers 1.6–1.9 mm long; filaments c. 0.5 mm long; style c. 1.4–1.6 mm long; stigmas 1.0–1.4 mm long. Capsule subglobular, abruptly narrowing to mucro 0.3–0.5 mm long, dark castaneous-brown, shining; capsule segments 1.8–2.0 × c. 1.2 mm including mucro. Seeds dark brown, oblong-ovoid, c. 0.9 mm long, 0.7–0.8 mm wide; appendage indistinct, c. 0.1 mm long, fibrillate.