SHREVE 



Plate 5 



A. Desert Slopes near mouth of Pima Canon. In foreground, from the left ;ire Parkinxonia microphylla, 

 Simmortdsia californica, ('arncuiva gigantea, Opuntia tountcifi, and Lifdum twrlandieri. 



B. Roeky Desert Slopes in same vicinity as A. Against the sky are Fouquieria splendens, Prosopia 

 velutina, and Alomitia pallifla; in foreground Sptw-ralcea pedata, Lippia wri'jhtii, and Opuntia 

 engelmanni. 



