AGROSTIDE.E. 261 



2-6 mm. long; palea as long as its glume terminating in two setas. 

 Orain linear, terete, 2 mm. long. 



Arizona (Santa Catilina Mts.), Fr ingle 884. 



Var. minor Scribn. ined. Plant more slender, spikelets pedicel- 

 late, the bristles of the empty glumes often as long as the rest of 

 glume, floral glume 2 mm. long, the awn more slender, often 10 mm. 

 or more long. 



Mexico, Pringh 2355. 



44. M. arenicola Buckl. Proc. Phila. Acad. 91 (1862). M. cws- 

 pitosa Chapm. Coult. Bot. Gaz. 3:18 (1878). M. sefifoiiaYnsey, 

 Coult. Bot. Gaz. 7:92 (1882). M. Beverchoni Y. & S. Contrib. 

 U. S. Nat. Herb. 3: 66 (1882). 



A slender erect tufted simple glaucous-green jjerennial, 30-60 

 cm. high, with fibrous roots. Sheaths half the length of the inter- 

 nodes; ligule thin, 4-7 mm. long; leaves of sterile shoots short, 

 blades conduplicate, rigid, almost filiform, 8-15 cm. long. Panicle 

 terminal, slender, diffuse, the base sometimes included, 20-30 cm. 

 long, rays in twos or threes, capillary, sparingly flowered on short 

 branches above the middle. Spikelets on pedicels 1-10 mm. long; 

 empty glumes oval to lanceolate or bristly pointed, subequal, 1- 

 nerved, one-fourth to two-thirds as long as the floret; floral glume 

 thin, shortly hairy on the nerves for the lower two-thirds, linear, 

 2-toothed, 3-nerved, 3 mm. long, awn 1-3 mm. long; palea linear, 

 2-toothed as long as its glume. 



Mexico, Pringle from Patterson. 



Texas, Wright, Reverclwn. Hovard, Nealley. 



Texas and Mexico. 



45. M. gracillima Torr. Pacif. Rail. Rep. 4:155 (1857). 



A slender glabrous densely-tufted perennial. 20-40 cm. high. 

 Ligule 3 mm. long; blades of sterile shoots numerous, conduplicate, 

 2-5 cm. long, 0.3 mm. diam., those of the culm 2-3 in number and 

 much the same. Panicle slender, often purple, pyramidal or con- 

 tracted, about 15 cm. long, rays capillary, mostly solitary, the 

 lower in twos and threes, sparingly branched, the longest 5-6 cm. 

 long, bearing 4-8 spikelets above the middle. Spikelets on pedi- 

 cels 4-10 mm. long, empty glumes thin, equal, 1-nerved, lanceolate, 



