GENERA OF GRASSES OF THE UNITED STATES. 



147 



reduced in M. schreberi (fig. 82), the type species, the first being 

 obsolete and the second not over 0.5 mm. long. In M. montana 

 (Nutt.) Hitchc. (Calycodon montanum Nutt ; Muhleribergia trifida 



Hack. ; M. gradlis 

 of authors, not 

 H. B.K.) the sec- 

 ond glume is 3- 

 toothed. Muhlen- 

 bergia capillaris 

 (Lam.) Trin. (fig. 

 83), of the South- 

 ern States, is a 

 handsome peren- 

 nial with diffuse 

 purple panicles. 

 There are nine 

 species in the 

 Eastern States; 

 the others are 

 western or mainly 

 southwestern. 

 Many of the west- 

 ern species are 

 important range 

 grasses and often 

 form a consider- 

 able proportion of 

 the grass flora of 

 the arid and semi- 

 arid regions. The 

 commonest of 

 these are M. mon- 

 tana and M. 

 wrightii V a s e y. 

 The second has a 

 spikelike leaden- 

 hued panicle. 



FIG. 82. Nimble Will, Muhlenbergia schreberi. Plant, X I ; branchlet showing both first 

 ana second glumes of two spikelets, spikelet with obsolete first glume, and floret, all 

 X 5. 



