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Caespitose perennial; culms up to 70(90) cm tall, erect, unbranched; basal leaf sheaths hard, shining and yellowish at first, glabrous or thinly pilose near the margins, terete, usually disintegrating into a cushion of persistent fibres; leaf laminas up to 30 cm × 3.5 mm, usually involute, rarely flat, faintly scaberulous on the surfaces or rarely thinly pilose above, thinly scabrid on the margins, the apex filiform.
Spikelets (2.4)2.9–3.4 mm long, dark olive-green to almost black; inferior glume 1/5–1/3 the length of the spikelet, oblong to obovate, hyaline, nerveless, glabrous, obtuse to acute at the apex; superior glume c. (1/2)2/3 the length of the spikelet, ovate, hyaline, 1-nerved, glabrous, acute at the apex; lemma as long as the spikelet, ovate-elliptic, acute; anthers 3, 1.2–1.7 mm long.
Panicle 3–20 cm long, spiciform; primary branches not in whorls, appressed to the main axis, 0.5–1.5 cm long, glabrous and smooth or thinly scabrid, eglandular, the spikelets densely arranged along their whole length.
Grain 1.1–1.2 mm long, obovate, rounded or truncate at the top, oblong in section.
