HOW TO KNOW THE GRASSES 



9a. Lemmas with 3 prominent nerves (the mid- 

 rib and one on each side of it); nerves often 

 hairy. Fig. 48 10 



SIDE 



BACK 



Figure 48 



9b. Lemmas with 5 or more nerves, which may 

 be inconspicuous. Fig. 49 42 



SIDE 



BACK 



Figure 49 



10a. Inflorescence small, dense, with few spikelets, partially surround- 

 ed by the leaves; small plants of the plains and deserts of the 

 West 11 



10b. Inflorescence an open or dense panicle which is supported above 

 the leaves on a peduncle 12 



11a. Lemmas long-hairy over the back; spikelets not concealed in 

 leaf sheaths 15b 



lib. Lemmas long-hairy only on the margins; spikelets concealed in 



the upper sheaths; sprawling, mat-forming plants 



See Fig. 248. CMunroa squarrosa) 



12a. Nerves or callus of the lemmas pubescent, 



13 



12b. Nerves and callus glabrous 19 



13a. Nerves of lemmas conspicuously pubescent; plants lacking rhi- 



14 



zomes 



27 



