Caespitose, occasionally rooting at nodes. Culms to 125 cm high. Leaves: ligule 10–20 mm long; blade to 30 cm long, 1.5–3.5 mm wide, adaxially scabrous, abaxially glabrous to scabrous. Panicles to 40 cm long; primary branches paired or clustered, appressed. Spikelets 10–16 mm long, with 4–6 cleistogamous and/or chasmogamous bisexual florets; pedicel to 20 mm long. Glumes unequal to subequal; lower glume (2.6–) 3.4–5 (–5.5) mm long, 1–3 (–5)-nerved; upper glume (3.1–) 4.5–6.2 (–6.7) mm long, 3–5-nerved. Lowest lemma 5–7.2 mm long, 2-toothed (often with 2 smaller lateral teeth or notches) or sometimes 4-toothed, (5–) 7-nerved, scabrous or rarely nearly smooth; inner teeth (0.25–) 0.3–0.65 (–1.05) mm long; awn usually arising 40–60% of lemma length below tip, 12–22 mm long, geniculate, with column twisted. Palea acute. Caryopsis 1.4–2.2 mm long.
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