FOREST TREES OF THE PACIFIC SLOPE. 



241 



northeastern Missouri, northwestern Nebraska, and throughout western mountains to 

 northern New Mexico and Arizona and central California ; Lower California (Mount 

 San Pedro Martir) and Mexico (mountains of Chihuahua). 



Alaska. — North in Yukon Valley to latitude of Arctic Circle on south slopes of 

 Endicott Mountains, west probably nearly to Bering Sea and south to inland side Pacific 

 Coast Range, and to its seaward side at Cook Inlet, and possibly at head of Lynn Canal. 

 Noted near International boundary in Yukon Valley, north side Yukon basin from Fort 

 Yukon to Deering (Bering Sea), Chandler River, Koyukuk River, Endicott Mountains 

 up to 2,000 feet, 10 miles below Walker Lake at head of Kobuk River. Dall River to 

 2,500 feet, Allen, upper Kuskokwim, Matanuska, Sushitna rivers, and Copper, Tanana, 



Fig. 101. — rnpuhtu tremuloides, Colorado form. 



and White rivers up to about 3,500 feet ; Lake Clark and near Nogheling River at base 

 of Alaska peninsula, on Cook Inlet at Tyonek, and on west slope and plateau of Kenal 

 Mountains; also reported at head Lynn Canal from Skagway to Glacier. 



Yukon and British Columbia. — West to inland slopes Pacific (oast Range. Noted 

 on Klondike, Stewart, McQuestion, and upper Pelly rivers, about Dease Lake, Liard 

 River between Dease and Francis rivers, eastern side Cassiar Range, upper Stikine 

 River and Skeena River above 100 miles from mouth. 



Washington.— Whole State but not common ; west of Cascades from sea level to 

 4,000 feet, and east of Cascades from 1,500 to 4,500 feet Noted West Washington 



National Forest generally above •".. I feet; locally on Slate Creek and other tributaries 



of Skagit River, 10 miles below Ventura, above Newby'e ; in East Washington National 



