164 



WATER 



Fig. 71.— Desert vegetaliuu with Cunugia gigantia, Yucca brevifolia, and Fou- 

 quieria splendens most prominent. Western Arizona. 



Fig. 72.-- a rctoslaphylos viscida, a broad-leaf sclcropliyll. Grass valley, 

 California. (Photograph by W. S. Cooper.) 



