MANUAL OF THE GRASSES OF THE UNITED STATES 



399 



loose, 5 to 15 cm. long, the branches 

 ascending or appressed, floriferous 

 from base; first glume acute, 1.5 mm. 

 long, the second longer, broader, 3- 

 nerved, 3-toothed; lemma 3 to 4 mm. 

 long, pilose below, scaberulous above, 

 the awn slender, flexuous, 1 to 1.5 

 cm. long, sometimes shorter. % 

 {M. trifida Hack., M. gracilis of au- 

 thors, not Kunth.) — Canyons, mesas, 

 and rocky hills, 2,000 to 3,000 m., 

 Montana to Utah and central Cali- 

 fornia, south to western Texas and 

 southern Mexico. 



46. Muhlenbergia filiculmis Vasey. 

 Slimstem muhly. (Fig. 565.) Culms 



Figure 564. — Muhlenbergia montana. Plant, X 

 1; glumes and floret, X 10. (Patterson 156, 

 Colo.) 



densely tufted, erect, filiform, 10 to 20 

 cm. tall, the leaves in a short basal 

 cluster; ligule prominent; blades in- 

 volute, filiform, mostly less than 

 5 cm. long; panicle slender, the 

 branches erect, mostly 2 to 5 cm. 

 long, sometimes as much as 10 cm.; 

 spikelets about 2.5 to 3 mm. long, the 

 glumes about half as long, awn- 

 tipped, the first rather narrow, acu- 

 minate, the second broader, 3-nerved, 

 sharply 3-toothed, rarely entire or 

 erose only; lemma pubescent on the 

 lower half, tapering to an awned tip, 

 or rarely with an awn as much as 4 

 mm. long. % — Open sandy or 



