316 



FOREST TREES OF THE PACIFIC SLOPE. 



streams in semiarid sections of lower Cascade and Siskiyou slopes. Locally noted on 

 upper Rogue River, in depressions between western spurs of southern Cascades and 

 northern spurs of Siskiyous, and also on North Fork of Applegate Creek in Siskiyous. 



California. — Throughout northern part in lower part of yellow pine belt and upper 

 range of Sabine pine ; generally at 2,000 to 5,000 feet, probably going westward to 

 inland border of coast redwood belt, and eastward at least to longitude of Mount Shasta, 



Fig. 147. — Qucrcus cat if arnica. 



around base of which it occurs (in Shasta National Forest) up to 4,500 feet on south 

 and west sides ; rather common in McCloud River valley, but more so about Sisson, 

 being especially abundant northward to south end of Shasta Valley ; frequent areas 

 at elevations between 2,000 and 3,500 feet on Squaw Creek, while large pure stands 

 occur on lower McCloud, Pitt, and Sacramento rivers. Abundant on west slope of 

 northern Sierras in canyons within yellow pine belt, at 3,000 to 5,000 feet elevation, 



