Perennials, usually 30–55 cm tall, loosely caespitose; rhizome ±creeping; stolons subterranean, ±ascending, to 12 cm long, with brown cataphylls and sparse fibrous cover. Basal leaves usually 8–15 cm long, often circinate, flat, c. 3–4 mm wide; cauline leaves 3–5, usually 3–7 cm long, c. 2 mm wide; sheaths dissected, ±dilated above, membranous bordered, ±abruptly narrowing to blade. All leaves with subulate apex; margins papillose-serrulate. Lower bract usually 2.0–3.5 cm long, subherbaceous, shorter or rarely ±longer than inflorescence. Inflorescence decompound, dense, usually 2–5 × 1.5–5 cm, with each main branch bearing dense anthela of 5–30 glomerate (usually 5–15-flowered) clusters. Bracteoles ±membranous, transparent, ovate-lanceolate, 2.5–3.0 mm long, sparsely ciliate. Tepals ±equal, glabrous, oblong-lanceolate, (4.0–) 4.2–4.6 (–5.2) mm long, ±white, subtransparent-ivory white to dirty whitish; midrib sometimes prominent. Stamens 6; anthers 1.1–1.5 (–1.8) mm long; filaments 1.5–1.9 mm long; style 1.9–2.2 mm long; stigmas 0.6–1.1 mm long. Capsule narrowly ovoid, acuminate, mucronate, castaneous-brown, shining; capsule segments 1.9–2.2 × c. 1.0 mm, including mucro 0.2–0.4 mm long. Seeds ellipsoidal, pale brown, shining, ±paler apically, 1.0–1.1 mm long, c. 0.6 mm wide; appendage 0.1–0.2 mm long, fibrillate.