GENERA OF GRASSES OF THE UNITED STATES. 261 
bunch-grass with tall slender culms, the feathery racemes in pairs, 
the rachis flexuous, the short common peduncle and usually the lower 
part of the racemes inclosed in the inflated sheathing bract, 
these bracts scattered 
along the culm on short 
branches. An allied spe- 
cies, A. elliottv Chapm., 
found in the Southeast- 
ern States, is distin- — 
guished by the conspicu- 
ously inflated upper 
foliage sheaths, the blade 
being often reduced to an 
appendage. Another im- 
portant species, belong- 
ing to this group but dif- 
Fic. 158.—Little bluestem, Andropogon scopa- 
rius. Plant, * 4; pair of spikelets with ; ; 
joint of rachis (at left), x 5. fering in aspect from the 
