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



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

 a slender creeping branching woody rhizome ; culms slender, wiry, 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. % (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, 

 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. 91 — Stream borders 

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



confined to southern California. 



22. Muhlenbergia sobolifera 

 (Muhl.) Trim (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 main culm 5 to 15 cm long, 3 to 8 mm 

 wide, occasionally larger, at time 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. 01 — Dry rocky woods and cliffs, New Hamp- 



Figube 754.— Muhlenbergia pungens. Plant, X 

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



glumes and 



Figube 755.— Distribution of 

 Muhlenbergia pungens. 



Figure 756.— 

 Muhlenbergia 

 filicul mis . 

 Panicle X 1; 

 glumes and 

 floret, X 10. 

 (Type.) 



