GENERA OF GRASSES OF 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. 
Fie. 20.—Diarina festucoides. Plant, * 4; spikelet and floret, « 5. 
