Tufted perennial, arising from a short oblique rhizome; culms 35–140 cm. high, 2–3 mm. in diameter at the base.. Leaf-blades flat, 20–40 cm. long, mostly 6–9 mm. wide, soft and shining, usually smooth with the secondary veins clearly visible, rarely sparsely pilose or scaberulous.. Panicle lanceolate to narrowly ovate, 15–40 cm. long, graceful, rather diffuse, the primary branches filiform and bare for most of their length, the spikelets ± appressed along the length of the secondary branches.. Spikelets 1.6–2 mm. long, dark green; lower glume lanceolate, 0.7–1.3 mm. long; upper glume narrowly ovate, 1.3–1.5 mm. long, 3/4–4/5 as long as the spikelet; lemma narrowly ovate, as long as the spikelet; anthers 3, 0.8 mm. long.. Grain ellipsoid, 0.7 mm. long.