Inferior glume (0.3)0.6–1(1.3) mm. long, inconspicuously 1-nerved, narrowly ovate, inserted close to the superior; superior glume 5-nerved, usually gibbous on the back, subcoriaceous to coriaceous, glabrous, rarely hairy, emarginate, usually mucronate.
Inferior floret male, its lemma 5-nerved, resembling the superior glume but less gibbous, the palea ciliate on its keels.
Culms 40–130 cm. high, erect or rarely geniculately ascending.
Leaf laminae 3–17 cm. long, (2.3)3–8(10) mm. wide.
Panicle 6–14(20) cm. long, broadly ovate.
Pedicels usually with a few long hairs.
Perennial from a knotty rootstock.
Spikelets 3.2–5 mm. long, ovate.