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Genus :


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Perennial grasses. Culms robust, 50-170 cm high. Leaf-blades linear, ligules shortly membranous. Inflorescence a single raceme, fragile, cylindrical, with 2 sessile spikelets sunk at each node, internodes clavate. Sessile spikelets 2-flowered, falling entire, callus truncate with prominent central peg, pedicelled spikelets reduced or absent; glumes 2, subequal, pubescent; lower glume coriaceous, 2-keeled, smooth or sculptured, winged or not; upper glume 3-nerved; lower floret reduced, upper floret bisexual; lemma entire, awnless, glabrous, 3-nerved; palea awnless, 2-nerved or nerveless. Lodicules fleshy, glabrous. Stamens 3. Ovary glabrous. 

Key to the species

Serial Key Reference
1a. Lower glume of the sessile spikelet oblong with a rounded obtuse slightly oblique apex; not winged at the tip; leaves narrow, not more than 4 mm wide; pedicelled spikelets suppressed M. laevis
1b. Lower glume oblong, oblique and winged at the apex; not winged at the tip; leaves 1.0-2.5 cm broad; pedicelled spikelets present but only as a rudiment seated on a free narrow pedicel M. merguensis