GENERA OF GRASSES OP THE UNITED STATES. 



53 



the florets, the first 1-nerved, the second 3-nerved; lemmas strongly 

 compressed, oval or elliptic, acute, awnless, 3-nerved, the lateral 

 nerves near the margin ; palea some- 

 what shorter than the lemma. 



Annual or perennial grasses, with 

 narrow panicles. Species two, one 

 in Mexico and South America, the 

 other in California. 



PIG. 20. Diarina festucoides. Plant, X \ ; spikelet and floret, X 5, 



