Mat-forming perennials, rhizomatous, bisexual. Leaves: ligule a ciliate membrane or a fringe of hairs; blade rolled in bud. Inflorescence a single raceme with spikelets arranged on all sides. Spikelets shortly pedicellate, strongly laterally compressed to terete, with 1 bisexual floret, falling with the glumes from the persistent pedicels; rachilla terminating at bisexual floret. Callus absent. Glumes 1 or 2, very unequal, smooth; lower glume minute or absent, nerveless; upper glume exceeding and enclosing the floret, obscurely 7.9-nerved, awned or aristulate via the excurrent midnerve, or awnless. Lemma aristulate, hyaline, dorsally rounded, 1-nerved. Palea conspicuous but relatively short to absent, 1-nerved or nerveless. Lodicules absent. Caryopsis: hilum short; pericarp fused.