Muhlenbergia purpusii Mez

Muhlenbergia purpusii Mez, Repert. vSp. Nov. 17: 214. 1921
Perennial; culms cespitose, slender, the lower internode (hidden in the sheath) puberulent; sheaths scaberulous, keeled, crowded at base of plant ; ligule 3-5 mm . long ; blades flat or mostly involute, scaberulous, 1 mm. wide or less, about 10 cm. long, curled or flexuous; panicle fusiform or subpyramidal, as much as 7 cm. long, the branches filiform, ascending, the pedicels (branches of the fourth order) longer than the spikelets ; glumes subequal, obtuse, about 1 mm. long ; lemma 2.3 mm. long, pilose, the awn as much as 15 mm. long.
Type locality: Minas San Rafael. San Luis Potosi (Pur pus 5011). Distribution: Known only from the type collection.