Rhizome elongate or rarely short, oblique. Culms 15-45 cm tall, slender, obtusely trigonous, smooth, clothed at base with brown sheaths disintegrating into fibers. Leaves shorter than culm, blades greenish, linear, 2-4 mm wide, slightly stiff, margins scabrous. Involucral bracts setaceous, sheathing for 1-2 cm, or spathaceous. Spikes 3-7; terminal spike male, cylindric, 3-4 × ca. 0.4 cm, slightly laxly flowered; peduncles slender, 2.5-5.5(-13) cm, scabrous above. Female glumes ferruginous, oblong, 3-3.5 mm, scabrous adaxially, margins very narrowly white hyaline, green 1-veined costa excurrent into a short mucro, apex subrounded or emarginate. Utricles stramineous-green or ferruginous above, equaling glume, narrowly elliptic, trigonous, ca. 4 mm, hirsute, ferruginous punctate or not, base gradually attenuate into a short stipe, apex abruptly contracted into a beak, orifice obliquely truncate, 2-toothed. Nutlets stramineous, tightly enveloped, oblong or obovate, trigonous, 2.5-3 mm, base shortly stipitate; style erect, base slightly thickened or not; stigmas 3. Fl. and fr. Jun-Jul.
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