MANUAL OF THE GRASSES OF THE UNITED STATES 389 



54. Muhlenbergia emersleyi Vasey. Bullgrass. (Fig. 810.) 

 Culms in large clumps, erect, 50 to 100 cm tall; sheaths glabrous, 

 slightly scabrous, compressed-keeled, especially those of the innova- 

 tions; ligule softly membranaceous, 1 to 2 cm long; blades flat or 



Figure 803.— Distribution of 

 Muhlenbergia capillaris. 



Figure 805.— Distribution of 

 Muhlenbergia expansa. 



Figure 804.— Muhlenbergia expansa. Panicle, X 

 1; glumes and floret, X 10. (Tracy 3701, Miss.) 



folded, scabrous, 1 to 4 mm wide, the lower as much as 50 cm long; 

 panicle narrow out rather loose, erect or nodding, mostly 20 to 40 

 cm long, the branches ascending, more or less fascicled or whorled, 

 naked below; spikelets 3 to 4 mm long, often purplish; glumes thin, 



Figure 806.— Muhlenbergia reverchoni. Panicle, X 1; glumes and floret, X 10. (Reverchon, Tex.) 



equal, acutish, scabrous; lemma about as long as the glumes, narrowed 

 and scabrous above, villous below, with a delicate flexuous awn, 

 about 1 cm long, or sometimes awnless. % — Rocky woods and 

 ravines, Texas to Arizona and Mexico. The awnless form with usu- 

 ally more open panicle has been differentiated as Epicampes subpatens 

 Hitchc. 



