Perennials. Inflorescence a single cylindric raceme; spikelets all alike, alternate, borne edgeways on and embedded in hollows in the rhachis. Spikelets 1-flowered with a rhachilla extension (and sometimes an extra vestigial floret), dorsally flattened, falling entire. Lower glume minute (but well-developed in the terminal spikelet); upper glume 5-12-nerved, appressed to the rhachis, covering the sunken floret, acute to caudately awned. Lemma 3-nerved, membranous, obtuse to acute; palea hyaline.