- Scientific Name: Carex atrata L.
- Ref: Sp. Pl. 2:976. 1753
- English Common Name: black-spike sedge
- Chinese Common Name: 黑穗薹草 hēisuì táicǎo
- Japanese Common Name: クロボスゲ [黒穂菅] kurobosuge
- Family: Cyperaceae
- Genus: Carex
- Distribution: Alpine frozen soil, thickets, alpine meadows. Jilin, Qinghai, Sichuan, Taiwan, Xinjiang, SE Xizang, NW Yunnan [Bhutan, India, Japan, Korea, Mongolia, Nepal, Russia; C Asia, Europe].
- Photo: 07/22/2010, Mt. Changbai, Jilin
Rhizome usually short. Culms densely tufted, 15-65 cm tall, trigonous, scabrous above, slightly inclined at apex, clothed at base with purple-red bladeless sheaths disintegrating into slightly reticulate fibers. Leaves shorter than culm, blades linear, 3-5 mm wide. Lower 1 or 2 involucral bracts leaflike, sheathless, upper ones setaceous or glumelike. Spikes 3-5, contiguous; terminal spike gynaecandrous, obovate or oblong; lateral spikes female, oblong, 10-15 × 5-6 mm, lower 2 with long peduncles, pendulous. Female glumes brown, dark brown, or purple-brown, ovate to narrowly ovate, 1-veined pale brownish costa forming a mucro at apex, apex acute to acuminate. Utricles brownish especially on upper part, nearly equaling or slightly shorter or longer than glume, elliptic or ovate, plano-convex, 3-3.5 mm, minutely papillose, without conspicuous veins except for 2 costas on edges, apex abruptly contracted into a conic short beak, orifice shallowly 2-toothed. Nutlets loosely enveloped, obovate, trigonous, 1.5-1.7 mm; style base not thickened; stigmas 3. (Flora of China)