Culms tufted, 12-18 cm tall, compressed triquetrous, slightly concave on 3 sides, few leaved basally. Leaves shorter than culm; sheath reddish brown, short; leaf blade 2-2.5 mm wide, flat, apical margin and midvein abaxially spinulose. Involucral bracts 4-7, leaflike, longer than inflorescence, ± horizontal to sometimes downward reflexed.