Fio. 83. 



DIAGRAMMATIC SUMMARY OF THE PRIMARY 

 CHARACTERS OF THE TRIBES 



SERIES I— POAT^ 



Spikelets laterally compressed; florets mostly falling from the 

 persistent glimies 



1. F esTucE a!, fescue tribe 

 Sgkelets many-flower ed. 

 Glumes relatively small. 

 Lemmas awned from summit 



or awnless. 

 Inflorescence a panicle. 

 [Contains fescues, brome- 

 grasses, and blue-grass.] 



2. HoBDBiE, barley tribe 

 Spikelets 1- to many-flowe red, 



sessile on opposite sides of a 



jointed rachis, forming a 



spike. 

 Rachis rather than spikelets 



speciaUzed. 

 Inflorescence a solitary spike. 



[Contains wheat, rye, and 

 barley.] 



3. AvENEM, oat tribe 

 Like Festuce se, but glumes en- 

 larged and florets fewer in 

 number. 

 Rachilla joints short. 

 Lemmas awned from the back. 

 Inflorescence a panicle. 

 [Contains oats.] 



95 



Rg. 84. 



Fig. 86. 



