132 



THE CONDOR 



Vol. XIX 



cure typical species of the eastern Cascade slopes. Good collections were made 

 at Gateway and Haycreek, and some work was done on Foley Creek in a spur 

 of the Blue Mountains east of Haycreek. 



Central Oregon lies between the Cascade and Blue mountains. The coun- 

 try is a high plateau and the rivers flow through deep canyons. The Deschutes 

 is the principal river flowing north. The John Day River and Willow Creek 

 flow into the Columbia in Gilliam County. Warm Spring River and the Meto- 

 lius are the largest tributaries flowing into the Deschutes from the west, while 





Fig. 49. Cliffs on Warm Spring River, north-central 

 Oregon; suitable nesting sites here afforded for 

 Say Phoebe, Raven, and Western Red-tailed Hawk. 



Crooked River is the main tributary from the east. The former rises high in 

 the Cascade Mountains, while the latter comes from the high Blue Mountains. 



A considerable part of this high dry area is in the Upper Sonoran life zone. 

 In northern Sherman and Gilliam counties there are still large areas of bunch- 

 grass ; but as this land is rapidly being broken up and the grazing land turned 

 into wheat ranches, some of the Upper Sonoran species will diminish in num- 

 bers to be replaced by those Transition species which increase with the culti- 

 vation of the country. The most conspicuous and abundant plant of the Upper 



