Culms loosely tufted from a knotty base with old sheath remnants, lacking basal scaly buds, erect, slender to moderately stout, 25–90 cm tall, 0.8–1.5 mm in diam., many-noded, sometimes branching. Leaf sheaths longer than internodes, tuberculate-hispid (especially the lower), older lower sheaths with disarticulated blades, glabrescent and spotted with tubercles; leaf blades lanceolate or linear-lanceolate, stiffly erect or becoming divaricate, flat with involute apex, 2–10 × (0.2–)0.3–0.6 cm; ligule ca. 0.5 mm. Panicle contracted, 4–8.5 cm, base included in uppermost sheath; branches glabrous in the axils, simple, lowest branch 2–2.5 cm. Spikelets 8–13 mm, green or purple, florets 4–9; glumes lanceolate or oblong; lower glume 1.5–3.5(–4) mm, 1–3(–5)-veined; upper glume 3–5 mm, 3–5-veined; lemmas lanceolate, lowest 4–5.5 mm, loosely pilose near margins and base, emarginate; awn 0.5–1.8 mm; palea keels scabrid. Anthers ca. 2 mm. Fl. and fr. Jul–Oct.
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