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FOC | Family List | FOC Vol. 23 | Carex

58. Carex atrata Linnaeus, Sp. Pl. 2: 976. 1753.

黑穗薹草 hei sui tai cao

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.

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].

1 Rhizome long, creeping.   58d subsp. longistolonifera
+ Rhizome short   (2)
2 (1) Utricles 4-4.5 mm.   58c subsp. aterrima
+ Utricles 3-3.8(-4) mm   (3)
3 (2) Female glumes ovate, apex acute; utricles sessile, apex abruptly contracted into a conic short beak.   58a subsp. atrata
+ Female glumes lanceolate, apex long acuminate; utricles shortly stipitate, apex abruptly contracted into a very short beak or beakless, orifice emarginate.   58b subsp. pullata

Lower Taxa


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