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FOC | Family List | FOC Vol. 23 | Carex

407. Carex aperta Boott in Hooker, Fl. Bor.-Amer. 2: 218. 1839.

亚美薹草 ya mei tai cao

Rhizome short, stoloniferous. Culms tufted, 60-70 cm tall, trigonous, rigid, smooth, scabrous above, clothed at base with reddish bladeless sheaths. Leaves shorter than culm, blades linear, ca. 3 mm wide, subflat, margins revolute. Involucral bracts leaflike, subequaling inflorescence, sheathless. Spikes 2 or 3; upper 1 or 2 spikes male, linear, 1-2.5 cm; remaining spikes female, cylindric, ca. 2 mm, densely many flowered, lower ones shortly pedunculate. Female glumes ferruginous-brown, lanceolate, 3-veined at middle, margins narrowly white hyaline. Utricles ferruginous-brown, shorter than glume, broadly elliptic or ovate-elliptic, inflated, 2.5-2.8 × ca. 1.8 mm, densely minutely papillose, nerveless except for 2 marginal veins, base rounded, apex abruptly contracted into a short smooth beak, orifice emarginate. Nutlets loosely enveloped; style base not thickened; stigmas 2.

Meadows. Heilongjiang [Russia (Far East); North America].


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