Perennial, with short rhizomes. Culms erect, ca. 60 cm tall, ca. 5 mm in diam., 3-or 4-noded. Leaf sheaths smooth, glabrous; leaf blades firm, 20–40 cm × 3–4 mm, adaxial surface and margins scattered pubescent; ligule ca. 2 mm. Panicle 10–16 cm; branches scabrid, varying in length, 2–4 per node, often with a single apical spikelet. Spikelets 15–25 mm, often purple, florets 5–7(–11); glumes narrowly lanceolate, pubescent or scabrid along keels; rachilla pubescent; lower glume ca. 7 mm, 1-veined, upper glume ca. 9 mm, 3-veined; lemmas 10–15 mm, abaxially pubescent, marginal veins densely hairy, awned from apex; awn 2.5(–6) mm, straight; palea as long as lemma, keels cilolate. Anthers ca. 4 mm. Fl. Jun–Aug.
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