Slender, tufted perennial, up to 0.3 m high. Leaves reduced to 2 or 3 sheaths. Flowers: in a simple or compound panicle, with clusters of sessile spikelets; perianth bristles reduced to 2 or 3 horn-like projections at base of nutlet; glumes 1.2-2.8 mm long; anthers oblong, 0.25-0.32 mm long; style 3-cleft. Fruit a 3-sided, smooth nutlet, 0.7-0.9 mm long.