Perennials 25–50 cm tall, loosely caespitose, ciliate; rhizome thin, creeping to ascending; stolons ascending, with base covered with brown cataphylls. Basal leaves usually 8–10 (–12) cm long, flat to involute, up to 2.5 (–3.5) mm wide; leaves of young shoots very narrow, involute; cauline leaves 3–5, of variable length, up to 3.5–4.0 mm wide but often very narrow, c. 1 mm wide. All leaves distinctly acuminate; margins papillose-serrate. Lower bract subherbaceous, up to 4–5 cm long, shorter than inflorescence. Inflorescence decompound, lax, erect to ±nodding, corymbiform; main branches often arcuate, each with loose anthela of 2–7-flowered clusters. Bracteoles whitish-membranous, ovate-lanceolate, c. 2.0–2.5 mm long, sparsely ciliate. Tepals ±equal, oblong-lanceolate, glabrous, 3.1–3.6 mm long, white or dirty white to whitish-membranous. Stamens 6; anthers 1.3–1.6 mm long, upper part (up to one third) bifurcate; filaments 0.4–0.6 mm long; style 1.4–1.9 mm long; stigmas 0.6–1.0 mm long. Capsule oblong-ovoid, long acuminate, mucronate, castaneous-brown, shining; capsule segments (2.3–) 2.4–2.7 (–2.9) mm long, including a mucro c. 0.2–0.4 mm long and 1.5–1.6 mm wide. Seeds ellipsoidal, dark brown, 1.3–1.4 mm long including a pale apex 0.1–0.2 mm long and c. 0.8 mm wide; basal appendage c. 0.1 mm long, fibrillate.