Culms to 8 m, 4–7 cm in diam., basally slightly flexuose, apically drooping; internodes 20–32 cm, those at base markedly shorter, usually flat and shallowly grooved above branches, white powdery, sparsely deciduously stiffly strigose; wall thick; basal nodes with rings of gray-white silky hairs below and above sheath scar and with short aerial roots; branching from 2nd or 3rd node up. Branches solitary on lower nodes, lower branchlets usually shortened into weak, curved thorns, 3 to several per node at mid-culm with primary dominant. Culm sheaths deciduous, glabrous, apex subtruncate, with a triangular protuberance on one shoulder; auricles unequal, larger auricle to 3 × size of smaller one, oblong or elliptic, ca. 8 mm; oral setae ca. 1 cm, undulate; ligule ca. 3 mm, shortly fimbriate, densely strigose; blade erect, triangular or narrowly ovate, base 4/5 width of sheath apex. Leaf blade linear-lanceolate to lanceolate, usually 13–20 × 1–2 cm, abaxially pubescent, adaxially glabrous. Inflorescence unknown.
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