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, 



FIG. 158. Little biucstem, Andropogon scopa- 

 rius. riant, X I ; pair of spikelets with 

 joint of rachis (at left), X 5. 



these bracts scattered 

 along the culm on short 

 branches. An allied spe- 

 cies, A. elliottii 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- 

 fering in aspect from the 



