PEDICELED SPIKE LETS WITH LARGE GLUMES 43 



which the midnerve leaves the body of the lemma 

 about the middle of its back and becomes a free 

 awn, while the lemma above the departure of the 

 awn is nerveless. This is invariably the case when 



FIG. 32. Spikelet of Trisetum 

 spicatum. 



the awn is dorsal (that is, pro- 

 truding from the back); the 

 lemma is always nerveless 

 above it. 



Compare Figs. 31 and 32 

 (Trisetum spicatum). It will 

 be seen that they are the same 

 type of spikelet. In Trisetum 

 the awn is loosely twisted 

 and is borne nearer the apex 

 of the lemma, which is tipped 

 with two slender teeth. 



In Danthonia spicata (Fig. 33) the florets are more 

 numerous and are smaller in proportion to the 

 glumes. The broad strongly twisted awn arises from 



FIG. 33. Spikelet of Danthonia 

 spicata; floret above. 



