Robust stoloniferous perennial forming a dense sward; culms 10–30 cm. high. Leaf-blades broadly linear, mostly 5–20 cm. long, 5–12 mm. wide, folded when young, obtuse; sheaths laterally compressed. Inflorescence 6–12 cm. long, the central axis herbaceously winged on the back to form anterior pockets (each containing a raceme) on alternate sides of a wavy midrib, the wing of at least the upper pockets produced into a broad acute tooth; raceme 7–15 mm. long, bearing 3–8 spikelets on an angular rhachis. Spikelets lanceolate to narrowly ovate, (3–)4–5 mm. long; lower glume up to 1/4 the length of the spikelet, nerveless, obtuse; upper glume as long as the spikelet, 7–9-nerved; lower lemma broadly convex on the back, the midnerve indistinct. Fig. 132.