Perennial, densely tufted, grayish green. Culms 15–45 cm tall, nodes geniculate. Ligule 1–2.5 mm; leaf blades conduplicate or flat, 1–3 cm, 1–1.5 mm wide, adaxial surface and margin scabrid. Panicle 5–15 cm; branches 2–5 per node, scabrid. Spikelets 4–6(–8) mm, florets 3–6, purple; glumes ovate, apex obtuse, lower glume 1.5–2 mm, upper glume 2–2.5 mm; lemmas 2.5–3 mm, base pubescent, apex triangular-rounded; palea keels pubescent in lower part, scabrid in upper part; anthers 0.7–1 mm. Fl. Jul–Aug. 2n = 28, 42.
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