Rhizomes clothed in hard imbricate scales, roots woolly. Culms erect, slender, 12–20(–50) cm tall, smooth and glabrous or rarely loosely pilose. Leaf sheaths hirsute, densely so at mouth; leaf blades flat, finally involute, pale green, 2–9 × 0.2–0.5 cm, hirsute to subglabrous, base rounded, apex pungent; ligule lacerate, 1–1.5 mm. Panicle up to 15 cm, racemes 4–8, inserted singly, (1–)3–5(–7) cm, ascending or eventually spreading. Spikelets cuneate, 5–6.5(–11) mm, florets 2–5; rachilla glabrous, internodes 1–2.5 mm; glumes lanceolate, dorsally often purplish, margins hyaline, glabrous or loosely pilose; lower glume 3–5 mm; upper glume 4–6 mm; lemmas purplish brown to brown-black or blotched with purple, lowest 4.5–5(–7) mm, pilose all over, acute or mucronate; palea pilose along keels, between upper keels and on outer flaps, apex 2-lobed. Callus glabrous. Anthers (1–)3–3.5 mm. Caryopsis narrowly oblong. Fl. Aug.
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