139 



PLATE V 



^ 



L. 





A. Dense growth of bank vege- 

 tation using water from an 

 irrigation canal in Imperial 

 Valley, Calif. 





Wild sunflower plant in 

 California. Sunflowers are 

 remarkably thrifty for long 

 periods in very dry places. 



Mesquite in the Coachella Valley, Calif., illustrating size 

 of bush. This is found in areas where ground water is within 

 reach of root systems. The size is an indication of depth to 

 water table; high ground water results in tall, dense growth. 



