TABLE 1 



RELATION OF TEMPERATURE AND PRECIPITATION TO SOME PREVAILING 

 TYPES OF SOUTHWESTERN DESERT VEGETATIONi/ 



Prevailing type of 

 natural vegetation 



Desert sage 

 ( Atriplex polycarpa j 



Desert sage and 

 creosote bush 



( Atriplex polycarpa 

 and Covillea gluti - 

 nosal 



Creosote bush 

 ( Covillea glutinosa ) 



Desert grass and 

 creosote bush 

 (Covillea glutinosa ) 



Creosote bush and 

 Yucca-cactus 



( Covillea glutinosa 

 and Yucca mohavensis 

 Ferocactus and 

 Opuntia bigelovii ) 



Desert grass 

 Short grass 

 Chaparral 



Locality 



Death Valley, Calif, 

 Indio, Calif. 

 Calexico, Calif. 

 Mecca, Calif. 

 Salton, Calif. 

 Mohawk, Ariz. 

 Las Vegas, Nev. 



Bagdad, Calif. 

 Yuma, Ariz. 

 Barstow, Calif. 

 Sentinel, Ariz. 

 Aztec, Ariz. 

 Gila Bend, Ariz. 

 Casa Grande, Ariz. 

 Maricopa, Ariz. 

 Phoenix, Ariz. 

 Mesa, Ariz. 

 Tempe , Ariz. 



Needles, Calif. 

 Mojave, Calif. 

 Parker, Ariz. 

 Logandale , Nev. 

 Lone Pine, Calif. 

 El Paso, Tex. 



Sierra Blanca, Tex. 

 Lordsburg, N. Mex. 



Deming, N. Mex. 

 Socorro, N. Max. 

 Alamogordo, N. Mex. 

 V/illcox, Ariz. 

 Carlsbad, N, Mex. 

 Douglas, Ariz. 



Florence, Ariz, 

 Tucson, Ariz. 



Wickenburg, Ariz, 

 Congress, Ariz. 

 Cabazon, Calif. 



17 After Shantz and Piemeisel (26). 



2/ Minus sign denotes below sea level. 



3/ Rainfall taken from Climatic Summaries of the United States 



containing climatic data from the establishment of stations to 1930, 



inclusive. 



