Culms 13–15 m, 6–7 cm in diam., basally flexuose, apically erect or slightly drooping; internodes slightly curved, 25–32 cm, not white powdery, lower internodes stiffly longitudinally dark brown strigose; wall 1–1.5 cm thick; branching to base. Branches solitary at lower nodes, 3 to several at upper nodes; lower branches densely interwoven with branchlets specialized into sharp, tough thorns. Culm sheaths tardily deciduous, leathery, abaxially white powdery, lower half sparsely stiffly dark brown hairy, margins white ciliolate or glabrous, apex broadly convex; auricles well developed, extremely unequal, ovate-oblong to ovate-lanceolate, undulate, wrinkled, inflated, both sides strigose; oral setae pale, ca. 1 cm, undulate; ligule 5–7 mm, dentate or laciniate, with unequal fimbriae; blade erect or those on upper nodes recurved, ovate-triangular to broadly lanceolate, base 1/3 width of sheath apex or broader, abaxially glabrous, adaxially stiffly dark brown hairy between veins, margin strongly involute, apex acuminate. Leaf blade linear-lanceolate, 6–15 × 0.6–1.6 cm, both surfaces glabrous or adaxially pubescent near base. Inflorescence unknown.
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