Caespitose, occasionally rhizomatous. Culms to 150 cm high. Leaves: ligule (4.5–) 6.5–8 (–10) mm long; blade to 37 cm long, 2–4 mm wide, adaxially scabrous on veins, abaxially glabrous to scabrous. Panicles 15–40 cm long; primary branches solitary or clustered, appressed, often flexuose. Spikelets 8–14 (–17) mm long, with 2–5 (–6) cleistogamous and/or chasmogamous bisexual florets; pedicel to 20 mm long. Glumes unequal; lower glume 3.8–6.3 (–7) mm long, 3 (–5)-nerved; upper glume (4.6–) 6.4–7.5 (–8) mm long, 5 (–7)-nerved. Lowest lemma 5.9–8.4 (–9) mm long, apex appearing constricted, 2 (–4)-toothed, 5–7-nerved, papillose to scabrous with very short stiff hairs along midrib; teeth 0.26–0.36 mm long, with outer teeth shorter; awn arising 25–35% of lemma length below tip, 13.8–25.5 mm long, geniculate, with column twisted. Palea acute. Caryopsis 2–3.5 mm long.
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