74 



FIRST BOOK OF GRASSES 



let as in Panicum, but the second glume and sterile 

 lemma are awned or awn-tipped, and the pointed 

 tip of the palea is not inclosed in the lemma, which 

 also is sharp-pointed. The glumes and sterile lemma 

 bear spine-like hairs, but not so thick as those of 

 Nazia. 



Observe the diagrammatic panicle in Fig. 67, A. 

 In imagination, remove all the terminal spikelets 



Fig. 67. A, diagrammatic 

 panicle; B, two branches 

 of panicle with terminal 

 spikelets removed. 



Fig. 68. Small part of bristly 

 panicle of Chcetochloa Grise- 

 bachii. 



from a branch. The result is Fig. 67, B. Compare 

 Fig. 68 with this. It will be seen that the bristles 

 of the latter are branches of the panicle which are 

 without spikelets at their tips but which bear sub- 

 sessile spikelets at or toward their base. This 



