Culms 5–12 m, 2–6 cm in diam., basally upright, apically slightly arched; internodes 30–45 cm, initially thinly white powdery, glabrous; wall 1–1.5 cm thick; nodes slightly prominent, sometimes basal node with a ring of gray-white silky hairs above sheath scar; branching from basal or 2nd node up. Branches several to many, clustered, central dominant, 4–6 mm in diam. Culm sheaths deciduous, leathery, basally stiffly deciduously dull brown strigose on inner margin, apex slanted outward and slightly asymmetrical, broadly arched; auricles deep brown, unequal, slightly wrinkled; larger auricle usually ovate, ca. 2.5 × 1.5 cm, those on upper culms nearly oblong or lanceolate; smaller auricle ovate or suborbicular, ca. 2/3 size of larger one; oral setae ca. 1 cm, undulate; ligule 2.5–3 mm, laciniate, fringed; blade deciduous, erect, nearly symmetrical, ovate-triangular to ovate-lanceolate, base rounded and extending outward to join auricles for 3–4 mm, nearly 2/5 width of sheath apex, abaxially very sparsely stiffly brown hairy, adaxially densely stiffly brown hairy near base, distally scabrid, apex acuminate, apiculate. Leaf blade linear-lanceolate, 7.5–18 × 1–2 cm, abaxially densely pubescent, adaxially glabrous or sparsely hairy near base. Pseudospikelets solitary, or several to many clustered at each node of flowering branches, clustered ones usually sterile, solitary ones usually fertile, fertile pseudospikelets 3–4.5 cm; florets 3–7, preceded by several gemmiferous bracts; rachilla segments flat, 2–4 mm, glabrous, apex thickened and cupular. Glumes elliptic, 6–7 mm, many veined, apex acute; lemma oblong-lanceolate, 1–1.5 × 0.4–0.8 cm, many veined, apex mucronate; palea slightly shorter than lemma, ciliate toward apex, 5-veined between keels; lodicules 3, 1.5–3 mm, upper margins long ciliate; anterior 2 subspatulate; posterior 1 slightly longer, obovate-lanceolate. Anthers 4–6 mm, apex penicillate. Ovary 3-ribbed, ovoid, 2–2.5 mm with stalk, apex hispidulous; style hairy, 1.5–2 mm; stigmas 3, shortly hairy, less than 1 mm. Mature caryopsis unknown.
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