SUMMARY OF PRIMARY CHARACTERS 99 



11. ANDROPOGONE^J, sorghum 

 tribe 



Spikelets paired, one perfect 

 and sessile, the other sterile 

 and pedicellate, borne on a 

 jointed rachis. 



Fertile spikelets with one per- 

 fect terminal floret and a 

 sterile lemma below; falling 

 with joints of rachis and 

 sterile pediceled spikelet at- 

 tached. 



Glumes indurate, inclosing the 

 florets; lemmas very thin; 

 palea often suppressed. 



[Contains sugar-cane, Johnson- 

 grass and broom-sedges.] 



12. TRIPS ACE-*;, corn tribe 



Plants monoecious. 



Pistillate spikelets with one 

 perfect terminal floret and a 

 sterile lemma below, falling 

 embedded in the joints of 

 the rachis. 'Persistent on 

 the thick compound axis in 

 Zea.) 



Staminate spikelets 2-flowered 

 in pairs, racemose. 

 [Contains gama-grass and 

 Indian corn.J 



FIQ. 93. 



FIG. 94. 



