PEDICELED SPIKELETS 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- 

 trudiDg 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 Darithonia 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 DarUhonia 

 spicata; floret above. 



