Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; 900 cm long; 50 mm diam.; woody; with root thorns from the nodes. Culm-internodes terete; thick-walled; 25 cm long; distally mealy. Lateral branches dendroid. Buds or branches present on lower quarter of culm. Branch complement several; with 1 branch dominant. Culm-sheaths deciduous; glabrous; triangular at apex; auriculate; with unequal auricles; with 3 mm wide auricles; setose on shoulders; shoulders with 3-4 mm long hairs. Culm-sheath ligule 1-2 mm high; dentate. Culm-sheath blade triangular; narrower than sheath; erect. Leaves cauline. Ligule an eciliate membrane. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades lanceolate; 6-9 cm long; 11-15 mm wide. Leaf-blade surface glabrous. Leaf-blade margins scabrous. Leaf-blade apex acuminate.