Plants 25–60 cm tall. Basal leaves usually 7–9 (–13) cm long, (4–) 5–6 (–8) mm wide; cauline leaves 2–3, usually 3.5–7.0 cm long and 2.5–4.5 mm wide. Stem rigid, erect, c. 1.7 mm in diam. Lower bract 2.0–6.5 cm long. Inflorescence composed of 3–4 ±sessile and 2–7 pedunculate clusters; peduncles usually with secondary branches and 1–3 sessile clusters on each branch; peduncles straight, rigid, erect and patent (very rarely one of them ±nodding), 0.3–0.5 mm in diam., 2–3 (rarely up to 11) cm long; clusters ±echinate, ±globular, 0.6–0.9 (–1.2) cm in diam., usually with more than 13 flowers. Bracteoles long acuminate, membranous, often with cupreous middle part, up to 3 mm long, equalling perianth or shorter, densely ciliate. Tepals long acuminate, blackish castaneous brown, subequal, sometimes one or two outermost ones distinctly longer than inner ones, 2.6–3.0 mm long. Anthers usually 0.8–1.2 mm long; filaments 0.5–0.9 mm long; style 0.5 mm long; stigmas 1.5–1.8 mm long. Capsule ±globular, rounded above with an indistinct mucro; capsule segments 1.8–2.0 mm long and c. 1.5 mm wide, dark brown. Seeds 0.9–1.1 mm long, 0.7–0.8 mm wide. 2n=42, fide J.K.Morton, Opera Bot. 121: 159–172 (1993), n.v.