Medium-sized forming dense thickets, rhizomes running extensively. Culm usually 4-6 m, dark green at first, later often completely yellow, erect; nodes not prominent; internodes terete except for upper ones flattened on one side. Culm-sheath greenish, brownish green or brownish pink; sheath-blade green, 3-6 cm, linear-subulate. Branches ± erect, several at each node, forming dense clusters. Leaf-sheath apex oblique. Ligule short. Oral bristles conspicuous. Leaf-blade partly or wholly drooping, 6-15-(18) × 0.6-1.5-(2.2) cm, ± lanceolate, uniformly dark green, acuminate.