De I. VNER VEW D Forest Trees of the Pacific Slope

110 FOREST TREES OF THE PACIFIC SLOPE.
RANGE.
Subalpine valleys, slopes, and ridges from southeastern Alaska, British Columbia, and
western Alberta southward through Washington, Oregon, Idaho, western Montana, and
Wyoming to southern Arizona and New Mexico.
ALASKA.-East slopes of coast range in southeastern part; crosses divide to west
slopes at Lynn Canal, where at sea-level, on west shore, it occurs in groups and extends
to Chilkoot and White passes, reaching timber line at about 8,000 feet. Possibly extends
farther south, at timber line, on west slope, and on sea coast, but not yet detected Appears
farther north in Copper River Valley at Mentasta P'ass and Copper Center (lat.
62', long. 145' 20'), northwestern limit.
PACIFIC CANADA -Yukon Territory, British Columbia, and Alberta. Throughout southeln
British Columbia from east slopes of coast range and eastward to east side of Continental
Divide in Alberta, except in southern dry parts of interior plateau. Northward
in Rockies to McLeod's l.ake (lat. 55'), but farther northward on interior plateau, and over
eastern slopes of coast range to Lake Bennett (lat. 60') at Lewes River (Yukon Territory)
; reappears north of Yukon River on North Fork McQuestion River (tributary Stewart
River), in lat. 64' 30', long. 136', northern limit. Occurs in northern interior plateau
and coast ranges at about 4,000 feet; lower limits are in xalleys of eastern coast ranges
at Lake Bennett, descending to 2,150 feet; occurs on Middle l.ake, Lake Dease, and l.ake
Schitliichroa, upper limits varying from about 3,000 feet at White Pass to 5,000 aind 5,500
feet on sheltered inland passes, such as Taku l'ass and mountains about Lake Dease and
Telegraph Creek (upper tributary Stikine River, about lat. 58'). Not on west slopes of
southern British Columbia coast range nor on Vancouver Island. On Gold and Selkirk
ranges and on both sides of Continental Divide, being abundant in Bow River i'ass, at
5,000 to 7,000 feet elevation, and on east slopes extending eastward on line of Canadian
P'acilic Rtailroad to Castle Mountain ; southward in Rockies, over high, cool valleys, to
latitude 49' and up to timber line. Renorted east of Continental Divide in Peace River
region and also in that between Lesser Slave Lake and Athabaska River.
WASHINGTON.-Both sides of Cascades, Olympic, northeastern, and Blue mountains,
at elevations of 5,000 to 7,500 feet. Northern part of Washington National Forest, on
west side Cascades, at elevations above 4,500 feet, but on east side, at 5,000 to 6,000
feet, or sometimes up to 7,000 feet, as at Slate and Windy Passes, and down to 2,150 feet,
as on Stehekin River. Locally noted as follows : Crater Pass, at 6,000 feet on west
side Cascades, and at 5,700 feet on east side ; Twisp P'ass Lake; North Fork Bridge
Creek; Emerald Basin, above and south of Lake Chelan, at 5,700 feet; North Fork of
Entiat River, at 6,000 to 7,000 feet; Entiat River, at 5,700 to 6,600 feet. Cascades in
southern Washington National Forest, generally at 5,000 to 6,000 feet, but sometimes to
7,100 and down to 2,300 feet, growing on both sides of range in Skykomish, Tolt, Snoqualmie,
Cedar, Green, White, Yakima, and Wenache river watersheds; Wenache Mountains,
at 4,500 to 5,200 feet. Mount, Rainier National Forest, generally at from 5,500
feet to timber line, but sometimes down to 4,000 feet and up to 7,500 feet; on both sides
Cascades in White, Puyallup, Nisqually, Cowlitz, Cispus, Lewis, Wind, Little White Salmon,
White Salmon, Elickitat, Atanum, Tieton, Natches, and Yakima river basins. Locally
noted in this region as follows: Mount Rainier, at 4,500 to 7,900 feet; Eagle Mountain
Cowlitz L'ass, at 4,750 feet; head of Summit Creek (on Cowlitz River), at 3,650 feet;
Cowlitz-American River Divide (near Dewey Lake), at 5,300 to 5,500 feet; Divide 3
miles north of Cowlitz P'ass, at 4,800 feet ; Mount Adams, at 6,000 to 6,500 feet ; Upper
Klickitat River, at 4,200 feet; Little Klickitat-Tlieton Rliver divide, at 5,900 feet; Cispus-
Kilickitat River divide, at 5,200 feet ; Goat and Olympic mountains, at 5,000 to 6,500
feet (timber line). Colville National Forest. along higher ridges. Washington addition
to Priest River National Forest, common above 4,500 feet; Wenalba National Forest, on
broader ridges in Blue Mountains, at 7,000 feet and at heads of streams.
OREGON.-tioth sides of Cascades, Siskiyous, and Blue Mountains; generally at elevations
between 5,000 and 7,800 feet; southxvard to north side of Siskiyous, but absent
from coast ranges. Northern part of Cascades at from 5,800 feet to timber line-sometimes
to 7,300 feet, and down to 3,4()(. Southern Cascades, at 5,8()0 to 7,800 feet;
southward on east side to point 10 miles south of Crater Lake, and on west side, to
Umpqua River Divide and north side of Siskiyous, where it is rare. Not on mountains
east of Cascades, except those in eastern, north and south parts of Blue Mountains
National Forest, and in Wallowa National Forest. Locally noted as follows, Southwest
side Mount [lood from near timber line down to a few hundred feet below Government
Camp; on north side from timber line down to 3,700 feet; Mount Mazama on Wizard
Island and rim. of lake down to 6,000 feet in Anna Creek Canyon ; Ilidaway Creek,
Granite Creek (near Alamo) ; South Fork of Rock Creek, at 6,450 feet; head and south
wall of Rock Creek; about Greenhorn City (Greenhorn Mountains) ; at point 8 miles
northwest of Alba; head of North Fork of John Day River: Powder River Mountains;
mountains about Minam River.