384 



MISC. PUBLK ATIOX 200, U. S. DEPT. OF AGRICULTURE 



21. Muhlenbergia polycaulis Scribn. 



(Fig. 540.) Perennial, from a firm 

 crown; culms numerous, wiry, de- 

 cumbent and scaly at base, 30 to 



Figure 536. — Muhlenbergia villosa. Plant, X 1 

 glumes and floret, X 10. (Type.) 



or ascending, 20 to 60 cm. tall, 

 branching from the lower nodes; 

 blades flat to subinvolute, mostly 5 

 to 10 cm. long, 1 to 2 mm. wide; 

 panicle 5 to 12 cm. long, narrow, 

 contracted, interrupted, the branches 

 short, appressed; spikelets 3 to -4 mm. 

 long, the glumes nearly as long, 

 acuminate; lemma sparsely pilose on 

 the lower part, acuminate into an 

 awn usually 1 to 3 mm. (rarely as 

 much as 8 mm.) long. % (M. 

 lemmoni Scribn.) — Deserts, western 

 Texas to southern California (Ja- 

 macha) and northern Mexico. 



Figure 537. — Muhlenbergia thurberi. Plant, X lj 

 glumes and floret, X 10. (Standley 7345, Ariz.) 



Figure 538. — Muhlenbergia curtifolia. 

 glumes and floret, X 10. (Ty 



Plant, X 1; 

 pe.) 



