LESSON IX 



DIVERSELY SPECIALIZED SPIKELETS 



IN Lesson IV, 

 Fig. 22 (page 31), 

 we had an example 

 of fertile and ster- 

 ile spikelets in the 

 same fascicle, the 

 fascicle falling as a 

 whole. Because the 

 type of spikelet 

 showed kinship 

 with grasses having 

 many-flowered lat- 

 erally compressed 

 spikelets, Achy- 

 rodes is placed with 

 them, although in 

 its fascicles falling 

 as a whole it forms 

 an exception. In 

 the grasses we are 

 about to study in 

 the present lesson, 

 clustered spikelets 

 are the characteris- 

 tic specialization. 



FlQ 



52 A)fascicle of & g0 pogon tenellus; 

 B lemma, and C, palea, spread out, of 

 sterile spikelet; D, lemma and E, palea of 

 perfect spikelet. 



61 



