Seasons in Southern Arizona. 



147 



north temperate climate. A sycamore {Plat anus wrightn) 

 occurs along streams as they pass through the belt of oaks 

 on the mountain sides. Of these, four species are to be 

 noted : Querciis emoryi, the largest of the region forms trees 

 of a height of 75 feet in some instances, with a fine trunk 

 and beautiful spreading crown. The acorns are much in 

 favor with the Indians and Mexicans as food under the name 



Fig. S. Group of Quercus, Xoliiia and Yucca on limestone slopes. 



of "biotas." Scarcely smaller is the white oak O. arizonica, 

 with Its oblong or ovate leaves which with the previous species 

 grows above 4000 feet and in company with the pinon of 

 this region which is Finns cembroides, the seeds of which are 

 also eaten by men and animals. Higher on the mountains 

 are encountered the blue oak, Q. ohlongifolia, the net-veined 

 oak, O. reticulata, the latter being usually a shrub, while still 

 a fourth species, O. hypoleiica occurs around Mt. Lemon. 



