Stems 13–30 cm tall. Basal leaves sparsely ciliate or subglabrous, 2.0–3.5 mm wide; cauline leaves usually 1–3, with upper ones 2.0–4.5 cm long and 1.0–2.8 mm wide. Lower bract usually 1.0–2.5 cm long. Inflorescence congested, of 2–6 clusters; clusters ellipsoid–ovoid or ovoid, 6–10-flowered, mostly pedunculate. Peduncles straight, smooth, rarely with secondary branches, to 0.8–2.5 cm long. Bracteoles 1.2–1.6 mm long, ciliate. Tepals dark brown, 2.4–2.9 mm long. Anthers 0.6–0.9 mm long, anther/filament length ratio 0.8–1.2; ovary 0.8–0.9 mm long; style 0.3–0.5 mm long; stigma 1.2–1.3 mm long. Capsules subacuminate, equalling or overtopping the perianth; capsule segments 2.0–2.4 mm long. Seeds ±ellipsoid, 1.0–1.1 mm long, 0.7 mm wide; appendage 0.2–0.3 mm long. 2n=36 [36AL], fide J.Kirschner, Thaiszia 2: 27 (1992).