Perennial herb, tufted, robust, 1.2-1.4 m high. Leaf blades 7.5-12 mm wide, flat to V-shaped. Culm nodose, 3-angled, 2.5-5.0 mm in diam. Inflorescence an interrupted panicle, apical co-florescence 40-60 x 20-35 mm. Subtending bracts: lowest with sheath 50-60 mm long. Spikelet bracts (glumes): female lanceolate, 5.6-8.4 x 1.8-2.0 mm, keel excurrent into long or short awn. Perigynium narrowly oblong, 5.6-9.0 x 0.7-2.0 mm (including 2-3 mm long rostrum), nervose, golden-brown. Flowering time Oct.-Dec. Nutlet linear-oblong, 4.2-5.2 x 0.6-1.6 mm, 3-angled.