386 



MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



Figure 541. — Muhlenbergia pauciflora. Plant, X 1; glumes and floret, X 10. (Wright 732, Tex.) 



lets, excluding awn, about 4 mm. 

 long, the glumes about half as long, 

 acuminate to awn-tipped; lemma 

 scaberulous only, tapering into a 

 slender flexuous awn, 5 to 20 mm. 

 long. % — Rocky hills and can- 

 yons, western Texas and Colorado, 

 Utah, and Arizona, south to northern 

 Mexico. 



23. Muhlenbergia arsenei Hitchc. 

 (Fig. 542.) Perennial, without rhi- 

 zomes but the spreading base some- 

 times rhizomatous in appearance, 

 loosely tufted; culms wiry, 10 to 45 

 cm. tall, branched below, the branches 

 erect; leaves crowded toward the 



base, the blades slender, involute, 

 sharp-pointed, 1 to 3 cm. long; pan- 

 icle narrow, rather loose, purplish, 

 2 to 10 cm. long, the branches as- 

 cending, floriferous from base; spike- 

 lets, excluding the awns, 4 to 5 mm. 

 long, the glumes shorter, acute or 

 subacute, awnless; lemma sparsely 

 pubescent below, tapering into a 

 flexuous awn 6 to 10 mm. long. 01 

 — Arid slopes, northern New Mexico 

 and southeastern Utah; southern 

 California (Clark Mountains). 



24. Muhlenbergia cuspidata (Torr.) 

 Rydb. Plains muhly. (Fig. 543.) 

 Culms slender, wiry, 20 to 40 cm. 



