Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; 600-700 cm long; 60 mm diam.; woody; without nodal roots, or with root thorns from the nodes. Culm-internodes terete. Lateral branches dendroid. Branch complement several. Culm-sheaths tardily deciduous; glabrous; convex at apex; auriculate; with unequal auricles; with 10-15 mm wide auricles, or 20-30 mm wide auricles; setose on shoulders; shoulders with curved hairs. Culm-sheath ligule 6 mm high; ciliate. Culm-sheath blade narrowly ovate; narrower than sheath; erect; hispid. Leaves cauline. Ligule an eciliate membrane. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades lanceolate; 5-10 cm long; 7-9 mm wide. Leaf-blade surface pubescent; hairy abaxially. Leaf-blade margins scabrous. Leaf-blade apex acuminate.