Perennial, forming large clumps. Culms robust, (0.7–)1–6 m tall, 1–2 cm in diam., glabrous. Leaf sheaths glabrous or pubescent, ciliate at mouth and margins; leaf blades (60–)100–200 × 1–2 cm, abaxial surface glabrous, adaxial surface velvety with long soft hairs on broad lower midvein, margins serrate, base narrow, apex long attenuate; ligule 1–2 mm. Panicle (25–) 30–80 cm, much branched, axis glabrous; racemes 3–5.5 cm; rachis internodes 3–5 mm, pilose with long silky hairs. Spikelets 3–4 mm, straw-colored tinged purple upward; callus hairs ca. 1 mm, shorter than spikelet; lower glume thinly cartilaginous, back pilose with silky hairs twice length of spikelet, keels scabrid, apex acuminate; upper glume usually glabrous in sessile spikelet, rarely thinly pilose, clearly pilose in pedicelled spikelet; lower lemma subequal to glumes; upper lemma lanceolate, apex mucronate or with awn to 3 mm. Lodicules glabrous. Anthers 1.8–2 mm. Fl. and fr. Aug–Dec. 2n = 30, 40, 50, 60.
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A grass. It grows 3.6 m tall. The stems are 2.5 cm wide. The leaves are narrow and 1.8 m long by 5 cm wide. They have a stout midrib. The flowering shoots are compact and 90 cm long. They have silky hairs and are white to pink.
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