Rhizome elongate. Flowering culms and vegetative culms spaced; flowering culms clothed by bladeless sheaths at base, pale brown, without leaves. Leaf blades of vegetative culms oblong-lanceolate, 10-20 × 1-2.5 cm, sometimes with white stripes, midvein and 2 lateral veins rather distinct, sometimes ciliate, glabrous adaxially, sparsely pilose on veins abaxially or on both surfaces. Flowering culms up to 30 cm tall; involucral bract sheaths inflated above and spathelike, 2-2.5 cm, with blade 5-10 mm. Spikes 3-6(-10), single or binate at each node, androgynous, or terminal spike usually male, linear-cylindric, 1.5-3 cm, loosely flowered; peduncles 2-6 cm, usually exserted. Female glumes elliptic-oblong to lanceolate-oblong, 4-5 mm, hyaline-membranous laterally, sparsely rusty punctate, green costa 3-veined, apex obtuse. Utricles obovate or elliptic, trigonous, 3-4 mm, glabrous or pilose, slenderly and prominently many veined, base attenuate into a very short stipe, apex contracted into a short beak or beakless, orifice truncate. Nutlet tightly enveloped, elliptic, trigonous, ca. 2 mm; style persistent, base not thickened, slightly exserted from utricle; stigmas 3. Fl. and fr. Apr-May.
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