250 POACE^. 



ligule lascerate, 2-2.5 mm. long; blades thin, involute or flat, 8-12 

 cm. long, 1.5-2 mm. wide. Panicles slender, linear (or spread- 

 ing ?), 10-15 cm. long, rays single or more or less clustered, the 

 longest rarely branching, 4-5 cm. long, bearing 4-8 spikelets along 

 the outer half or two-thirds. Spikelets racemose on pedicels about 

 1 mm. long; empty glumes equal, hyaline, awl-shaped, 1-nerved, 

 1.5-2 mm. long; floral glume 3-nerved, almost hyaline, linear- 

 lanceolate, pubescent on the margins, 2-tootlied, 2.5 mm. long, the 

 awn about the same length; palea 2-toothed, as long as its glume. 

 Anthers oval, 0.4 mm. long. 



Mexico (Jalisco), Palmer 645. 



23. M. filiculmis Vasey, Contrib. U. S. Nat. Herb. 1:267 

 (1893). 



A slender erect smooth glaucous perennial. 20-30 cm. high. 

 Ligule 2-2.5 mm. long; blades involute, about 0.5 diam. before 

 spreading, none extending more than one-third the height of the 

 culm. Panicle simple, narrow, 3-4 cm. long, longest ray 1-2 cm. 

 long, flower-bearing for the outer two-thirds. Spikelets with first 

 empty glume 1-nerved, 1 mm. long, second 3-nerved, 3-toothed, 5 

 mm. long; floral glume ciliate on the margins of the lower half, 3- 

 nerved, 2.5 mm. long, shading into an awn about 1 mm. long; 

 palea linear to elliptical when spread, as long as its glume. Anthers 

 3 in number. 1.4 mm. long. 



Colorado (Ute Pass), C. S. Sheldon in 1892, at 8500 feet alt. 



Nearly related to M. gracilis hreviaristata Vasey, but more 

 slender. 



24. M. monticola Buckley, Proc. Accid. Phila. 91 (1862). 



An erect or decumbent branching glabrous light reddish-green 

 perennial, 30-60 cm. high. Sheaths shorter than the internodes, 

 the lower ones crowded off by branches: ligule thin, lascerate, 2-3 

 mm. long; blades involute, 5-10 cm. long, 2 mm. wide. Panicle 

 slightly exserted, or the base included, slender, interrupted, loosely 

 spikelike, 4-10-15 cm. long; rays simple, appressed, flower-bearing- 

 for the entire length, 0.5-3 cm. long. Spikelets on pedicels 0.5-2 

 mm. long; empty glumes thin, linear, acute or obtuse, 1-nerved; 

 first 1 mm. long, second 1.5-1.7 mm. long; floral glume acute,. 



