Herbs, perennial, densely cespitose, 15--40(--50) cm. Leaves erect or ascending, 10--30 cm; sheaths glossy light brown or red-brown, firm; blade green, linear to filiform, often angularly terete, or sulcate, rarely to wide. Inflorescences: scape sheaths exceeded by leaves; scapes linear, straight or flexuous, terete, 1 mm wide, rarely 1-ribbed; spikes ovoid to ellipsoid, 4--7 mm, apex acute; fertile bracts 4--5 mm, margins entire or erose, apex rounded. Flowers: lateral sepals included, reddish brown, slightly curved, less than 5 mm, keel scarious, lacerate from middle to tip; petals unfolding in morning, blade obovate, to 5 mm; staminodes beardless. Seeds translucent, fusiform to cylindric, (0.7--)0.8--1 mm, finely lined longitudinally. 2n = 18.
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