370 MISC. PUBLICATION 200, V. S. DEPT. OF AGRICULTURE 



20. Muhlenbergia glauca (Nees) Mez. (Fig. 759.) Perennial, from 

 a slender creeping branching woody rhizome ; culms slender, why, erect 



or ascending, 30 to 60 cm 

 tall, branching from the 

 lower nodes ; blades flat to 

 subin volute, mostly 5 to 10 

 cm long, 1 to 2 mm wide; 

 panicle 5 to 12 cm long, 

 narrow, contracted, inter- 

 rupted, 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 6 

 mm) long. 91 (M. lem- 

 moni Scribn.) Deserts, 

 western Texas to southern 

 California (Jamacha) and 

 northern Mexico (fig. 760). 

 21. Muhlenbergia cali- 

 fornica Vasey. (Fig. 761.) 

 Perennial, pale, leafy, the 

 base more or less creeping 

 and rhizomatous; culms as- 

 cending, somewhat woody 

 below, 30 to 60 cm tall, 



i r r -i -i ,1 



branching below; sheaths 

 scaberulous; blades flat, 4 

 to 6 mm wide, scabrous, usually short; panicle narrow, dense but in- 

 terrupted, 7 to 15 cm long; spikelets 3 to 4 mm long, the glumes 

 slightly shorter, scabrous, acuminate, awn-tipped; lemma 

 scabrous, acuminate, awn-tipped, with sparse callus hairs 

 about half as long as the lemma. 01 Stream borders 

 and gullies, foothills and mountain slopes up to 2,000 m, 

 confined to southern California. 



22. Muhlenbergia sobolifera 

 (Muhl.) Trin. (Fig. 762, A) Peren- 

 nial, with numerous creeping scaly 

 rhizomes 2 to 3 mm thick; culms 

 erect, slender, solitary or few in a 

 tuft, glabrous, 60 to 100 cm tall, 

 sparingly branching, the branches 

 erect; blades flat, spreading, scab- 

 rous, those of the mam culm 5 to 15cm long, 3 to 8 mm 

 wide, occasionally larger, at tune of flowering aggregate 

 along the middle part of the culm; panicles slender, some- 

 what nodding, mostly 5 to 15 cm long, the distant bran- 

 ches appressed, floriferous from base, over-lapping or the 

 lower more distant; spikelets mostly 2 to 2.5 mm long, 

 the glumes about two thirds as long, abruptly acuminate 

 or awn-tipped; lemma elliptic, bluntish, pubescent on the lower part, 

 usually apiculate. <4 Dry rocky woods and cliffs, New Hamp- 



FIGURE 754. Muhlenbergia pungens. Plant, X 1; glumes and 

 floret, X 10. (Jones 6046, Utah.) 



FIGURE 755. Distribution of 

 Muhlenbergia pungens. 



FIGURE 756. 

 Muhlenbergia 

 filiculmis. 

 Panicle X 1; 

 glumes and 

 floret, X 10. 

 (Type.) 



