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Perennials, rhizomatous or stoloniferous, sometimes sward forming. Culms slender to robust, leafy, internodes short. Leaf blades broadly linear to filiform, flat; ligule membranous or ciliate. Inflorescence digitate or sometimes 2 or more closely spaced whorls; racemes unilateral, slender; spikelets sessile, imbricate, biseriate; rachis flat or semiterete. Spikelets strongly laterally compressed, floret 1, with or without rachilla extension (very rarely 2nd floret present), narrowly ovate, awnless, disarticulating above glumes; glumes subequal, shorter or as long as floret, narrow, herbaceous, 1-veined or upper glume 3-veined, apex acuminate, both or only lower glume persistent; lemma keeled, boat-shaped, cartilaginous, 3-veined, usually pubescent on keel, apex entire, awnless. Caryopsis ellipsoid, laterally compressed. x = 9, 10.
Rhizomatous or stoloniferous perennials, usually low-growing, often sward-forming. Leaf-blades linear and flat, sometimes filiform; ligule membranous, often ciliolate on the upper edge. Inflorescence of digitate 1-sided spikes, these sometimes borne in 2 or more closely spaced whorls. Spikelets narrowly ovate, 1-flowered, with or without a rhachilla-extension (this very rarely bearing a tiny vestigial floret), strongly laterally compressed, imbricate in 2 rows, awnless; glumes 2, narrow, subequal, shorter than the floret, 1-nerved (rarely the upper 3-nerved); lemma narrowly ovate in side view, ± ciliate on the keel and often also on the side-nerves, usually glabrous on the flanks, its callus glabrous. Caryopsis ellipsoid, laterally compressed.
Spikelets 1-fld, articulated above the glumes; glumes narrow, subequal, 1-veined; lemma strongly flattened, 3-veined, acute, awnless, the lateral veins near the margin; palea narrow, nearly as long as the lemma; rachilla prolonged behind the palea as a slender bristle half as long as the lemma; perennials with short blades, the ligule a ring of hairs, and slender digitate spikes of small spikelets. 10, warm reg.
Spikelets 1-flowered, sessile in two rows on one side of the narrow triangular rachis, the rachilla disarticulating above the glumes, prolonged beyond the spikelet in a naked stipe, sometimes bearing a rudimentary floret; glumes subequal, acumi-nate, 1-nerved, the first lunate, the second lanceolate; lemma acute, awnless, 3-nerved, pubescent on the nerves; palea narrow, acute, as long as the lemma.
