Slender caespitose annual or perennial. Culms erect, branching intravaginally, 25–75 cm high. Leaves: ligule 3.3–4.8 mm long, acuminate; blade involute or ± flat, 7–35 cm long, 0.5–1.5 mm wide. Inflorescence contracted at anthesis, enclosed by flag leaf sheath, 8–29 cm long; lateral branches scabridulous, bearing spikelets throughout; primary branches undivided at least 0.5–6 mm, up to 3–37 mm; maximum total branch length 11–120 mm. Spikelets 4–10 mm long; bisexual florets 3–9. Lower glume 1.2–2.2 mm long; upper glume 2–3.3 mm long. Callus long-ciliate. Lemma 2.4–3.7 mm long, broadly acute, glabrous or puberulous near base; midvein not extending to apex. Palea 2.3–3.4 mm long; keels scabrous-ciliate in lower half. Anthers 1.1–1.7 mm long, rusty brown.
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