MANUAL OF THE GRASSES OF THE UNITED STATES 



407 



Figure 575. — Muhlenbergia xerophila. Panicle, X 1 ; glumes and floret, X 10. (Silveus 3477, Ariz.) 



somewhat loose, erect, 20 to 40 cm. 

 long, the branches ascending or ap- 

 pressed; spikelets 2 to 3 mm. long; 

 glumes subequal, acutish, usually gla- 

 brous; lemma usually about as long 

 as the glumes, glabrous, awnless, 

 rarely with a minute awn. % (Epi- 



Figure 576. — Muhlenbergia metcalfei. Panicle, X 1; 

 glumes and floret, X 10. (Metcalfe, N Mex.) 



flexuous awn 1 to 1.5 cm. long. <2[ 

 (M. berlandieri Trin.) — Rocky or 

 gravelly soil, Texas to Arizona and 

 northern Mexico. 



64. Muhlenbergia longiligula 

 Hitchc. (Fig. 583.) Culms erect, about 

 1 m. tall, the base hard, wiry, cylin- 

 dric, the lower sheaths expanded; 

 ligule (or auricle of sheath) firm, usu- 

 ally about 1 cm. long; blades as much 

 as 50 cm. long, 2 to 5 mm. wide, flat 

 to subinvolute, very scabrous, usually 

 drying involute; panicle narrow, 



Figure 577. — Muhlen- 

 bergia dubia. Plant, X 

 1 ; glumes and floret, 

 X 10. (Hitchcock 

 3775, N. Mex.) 



Figure 578. — Muhlen- 

 bergia dubioides. Pan- 

 icle, X 1 ; glumes and 

 floret, X 10. (Type.) 



