MANUAL OF THE GRASSES OF THE UNITED STATES 



391 



Figure 549. — Muhlenbergia dumosa. Plant, X 1' 

 glumes and floret, X 10. (Pringle, Ariz.) 



flat or soon involute, smooth, those 

 of the branches mostly less than 5 

 cm. long and 1 mm. wide; panicles 

 numerous on the branches, common- 

 ly exceeded by the leaves, 1 to 3 cm. 

 long, narrow, somewhat flexuous; 



spikelets, excluding the awn, about 



3 mm. long, the glumes scarcely half 

 as long, thin, pale with a green mid- 

 nerve, usually minutely awn-tipped 

 or with an awn as much as 9 mm. 

 long ; lemma narrow, pubescent about 

 the base and margin, pale with green 

 nerves, the awn from the slightly 

 notched apex, flexuous, 3 to 5 mm. 

 long. % — Canyons and valley 

 flats, southern Arizona to Jalisco, 

 Mexico. Has the aspect of a miniature 

 bamboo. 



31. Muhlenbergia andina (Nutt.) 

 Hitchc. Foxtail muhly. (Fig. 550.) 

 Perennial, with numerous scaly rhi- 

 zomes; culms erect or sometimes 

 spreading, scabrous-puberulent below 

 the nodes and the panicle, 50 to 100 

 cm. tall; sheaths smooth or slightly 

 scabrous, keeled; ligule 1 mm. long, 

 membranaceous, short-ciliate ; blades 

 flat, 2 to 6 mm. wide, scabrous; 

 panicle narrow, spikelike, usually 

 more or less lobed or interrupted, 

 grayish, silky, often purple-tinged, 

 7 to 15 cm. long; glumes narrow, 

 acuminate, ciliate-scabrous on the 

 keels, 3 to 4 mm. long; lemma 3 mm. 

 long, tapering into a capillary awn 



4 to 8 mm. long, the hairs at base 



Figuke 550. — Muhlenbergia andina. Plant, X 1 ; glumes and floret, X 10. (Elmer 558, Wash.) 



