Tufted perennial, the basal leaf-sheaths woolly and usually becoming fibrous.
Callus 1–1.5 mm. long, linear, obliquely pungent or asymmetrically 2-toothed.
Inferior glume obtuse to subacute; superior glume obtuse to acute.
Spikelets 8–14 mm. long, tuberculate setose, rarely glabrous.
Panicle 5–35 cm. long, ovate, loose or somewhat contracted.
Culms 40–100 cm. high.
Stamens 2.