384 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTUKE 



the lower as much as 10 cm long; spikelets, excluding awns, about 

 4 mm long, the glumes from minute to about one-fourth as long, 

 acute to erose-obtuse; lemma strongly nerved, hairy on the callus 



Figure 792.— Muhlenbergia porteri. Plant, X 1; glumes and floret, X 10. (Chase 5887, Tex.) 



and with a flexuous awn 1 to 1.5 cm long. Ql (M. berlandieri 

 Trin.) — Rocky or gravelly soil, Texas to Arizona and northern 

 Mexico. 



47. Muhlenbergia metcalfei Jones. (Fig. 

 801.) Perennial, in close tufts; culms erect, 

 50 to 80 cm tall; ligule 3 to 10 mm long, 

 sometimes longer; blades involute, slender, 

 flexuous, scabrous, sometimes only slightly so, 

 not crowded at base; panicle narrow but some- 

 what loose, pale or slightly purplish, 15 to 25 

 cm long, the branches usually naked at base; 

 spikelets tapering to summit, about 4 mm long; glumes nearly equal, 

 obtuse, a little less than half as long as spikelet; lemma scaberulous 

 toward summit, the awn 5 to 10 mm long. % —Rocky hills, Texas, 

 New Mexico, and Arizona. 



Figure 793.— Distribution of 

 Muhlenbergia porteri. 



