SP I RELETS WITH HARDENED FRUITS 



73 



the spikelets attached. (Recall Lepturus, Lesson V, 

 Fig. 28, page 37.) 



In Syntherisma, Paspalum, Reimarochloa, and 

 Stenotaphrum, with subsessile spikelets borne on one 

 side of a rachis, the spikelets 

 are placed with the back of the 

 fertile lemma against the rachis, 

 that is, with the first glume 

 (developed or hypothetical), 

 sterile lemma, and the palea of 

 the fertile floret outward. In 

 Axonopus (Fig. 65), Brachiaria, 

 and Eriochloa the spikelets are 

 reversed, the back of the fertile 

 lemma being turned from the 

 rachis and the palea toward 

 it. In Axonopus the first glume 

 is wholly suppressed. In Erio- 

 chloa (Fig. 66) the first glume 



is reduced 

 to a mi- 

 nute 



Fig. 66. A, spikelet of 

 Eriochloa punctata; 

 B, fertile floret. 



Fig. 65. A, part of raceme 

 of Axonopus furcatus; B, 

 sheath inflorescence; C, cross- 

 ! . t section of rachis. 



around the 



enlarged rachilla joint below the 



second glume and grown fast to it. 



The fertile lemma is tipped with 



a minute awn, which breaks off 



readily. 



In barnyard-grass, Echinochloa 

 Crusgalli, is the same type of spike- 



