Perennials, usually 8–18 cm tall, caespitose, subglabrous; rhizome ascending; plant base straw-brownish or pale castaneous brown. Basal leaves numerous, crowded, ±flat, usually up to 5 cm long, (2–) 3–4 mm wide; cauline leaves (1–) 2, 1–2 (–3) cm long, 1–2 mm wide; all leaves with obtuse slightly swollen tip with spinuliform mucro (caducous). Inflorescence congested in a single dark many-flowered head 0.8–1.0 × 0.6–0.9 cm, composed of 1–3 clusters; basal cluster sometimes on erecto-patent peduncle up to 3 cm long. Lower bract usually scarious to straw-brown, subglabrous, linear-lanceolate, 4–9 mm long, much shorter than inflorescence. Bracteoles ±ovate, ±obtuse, sparsely ciliate above, up to 1.2 mm long, dark brown. Tepals subequal, 1.6–1.9 (–2.0) mm long, acute, dark castaneous to blackish brown. Stamens 6; anthers 0.3–0.6 mm long; filaments 0.4–0.5 mm long; style 0.1–0.2 mm long; stigmas 0.8–1.0 mm long. Capsule ovoid-trigonous, exceeding tepals; capsule segments 2.1–2.3 × c. 1.2 mm, blackish brown. Seeds ellipsoidal, 1.0–1.2 × 0.6–0.7 mm, brown, distally with a greyish tip; basal appendage up to 0.2 mm long, fibrillate. 2n=24, fide G.Knaben & T.Engelskjøn, Acta Borealia, A. Sci., 21: 4 (1967).