GENERA OF GRASSES OF THE UNITED STATES. 
147 
reduced in I/. schreberi (fig. 82), the type species, the first being 
obsolete and the second not over 0.5 mm. long. 
In WW. montana 
(Nutt.) Hitche. (Calycodon montanum Nutt.; Muhlenbergia trifida 
Fic. 82.—Nimble Will, Muhlenbergia schrebert. 
Hack.; If. gracilis 
of authors, not 
Hi. B. K.) the see- 
ond glume is 3- 
toothed. JZuhlen- 
bergia capillaris 
(Lam.) Trin. (fig. 
83), of the South- 
ern States, 1s 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 I/. mon- 
jong and MM. 
wrightii Vasey. 
The second has a 
spikelike leaden- 
hued panicle. 
Plant, XK 4; branchlet showing both first 
aml second glumes of two spikelets, spikelet with obsolete first glume, and floret, all 
x 5 
