Culms loosely tufted from a knotty base with scaly buds, erect, very slender to moderately stout, 30–90 cm tall, 0.5–1.5 mm in diam., often branched above base, internodes often purple. Leaf sheaths mostly shorter than internodes, pilose above middle with tubercle-based hairs or glabrous; leaf blades linear-lanceolate, thin, flat, patent, 3–15 × 0.3–1 cm, glabrous or thinly pilose, acute; ligule 0.3–0.5 mm. Panicle open, exserted, 4–10 cm; branches few, laxly spreading, lowest branch 2–5 cm. Spikelets 5–9 mm, florets 2–5; glumes lanceolate or lanceolate-ovate; lower glume 0.5–3 mm, 0–1-veined, obtuse to acute; upper glume wide, 1–4.7 mm, 1–3-veined (or terminal spikelet 3–5-veined), narrowly obtuse to acute; lemmas lanceolate, lowest 4–6 mm, usually with dark transverse blotches, pilose along lower margins and keel, emarginate; awn 2–9 mm; palea keels scabrid. Fl. and fr. Jul–Nov. 2n = 40.
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