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

FOREST TREES OF THE PACIFIC SLOPE. 53
Slskiyou and Modoc counties) at 6,700 to 7,500 feet, and Warner Mountains (Modoc
County), here noted on South Deep Creek; west base Mount Eddy in Trinity National
Forest, at 5,000 to 7,000 feet; northeast slope of Mount Shasta at 5,400 feet altitude (3
miles northeast of Ash Creek) to 5,600 feet (3 miles northwest of Inconstance Creek);
between south base of Mount Shasta and Black Fox Mountain; general over Mount Shasta,
Plumas, Lassen Peak, and Diamond Mountain National forests, at 6,000 to 7,500 feet, or
sometimes between 4,000 and 8,000 feet. North slopes of Lassen Peak on Hat Creek,
south slopes down to 5,500 feet. Plumas County: Eastward to Prattville and to west side
of Spanish Peak range (west of Quincy), below 5,500 feet and westward to Bucks Valley
at 5,100 feet. Sierra County: Eastward to east side Yuba Pass (above Sierra Valley);
westward from 6,000 feet on west slope of main divide down to 5,200 feet (Basset Road
touse) ; South Sierra Valley eastward into Nevada. Nevada and Placer counties: Westward
from Truckee on Truckee Canyon to Donner Lake region and down west slopes of
Sierras from 8,000 feet, to Cisco and Emigrant Gap below 6,000 feet. Eldorado County:
Eastward to Tallac (south end Lake Tahoe) and southward (along Little Truckee River);
westward to Grass Lake Valley at 7,800 feet; west slope Sierras from Summit (7,500 feet)
westward to Echo (5,500 feet). Alpine County: Eastward to Silver Creek at 7,500 feet,
and westward over Mokelumne Pass into Calaveras County, here extending to point 10
miles west of Bloods. Northern Sierras, at 6,000 to 9,000 feet-sometimes down to 4,500
feet on west slopes; Stanislaus National Forest, at 6,000 to 9,300 feet-rarely down to
3,500 feet or up to 10,000 feet. Tuoluenne County: Eastward on east side Sierras over
Sonora Pass (9,600 feet) to Walker Creek Valley (8,200 feet), Mono Pass (10,200 feet), and
adjacent west slopes of Mount Dana, Mount Gibbs, Saddleback Lake, and Tioga Pass;
westward on west side Sierras to between Cold Spring and Eureka at 6,200 feet; Aspen
Meadows at 6,200 feet. Mariposa County: Westward to 6,400 feet (road Yosemite to
Crockers), Fish Camp (3 miles south of Wawona, at 4,900 feet. Mono County: Eastward
nearly to Mono Lake on Leevining Creek, below Mono Pass from 9,400 feet down to Walker
Lake, Devil's Cauldron, and southward to Mammoth. Southern Sierra National Forest, at
6,900 to 10,500 feet-rarely down to 5,500 feet or up to 11,500 feet; generally at 9,000 to
11,500 feet on east slopes. Fresno County: Westward to Junction Meadow, Dinkey Creek
(tributary Kings River) below 5,500 feet; eastward to Kearsarge Pass. Tulare County:
Noted around Rowell Meadow and southward to Clover Creek divide; upper Kaweah Rivel
region; upper part of Sequoia National Park and about Alta Meadow; head basin of East
Fork of Kaweah River (Mineral King to Farewell Gap) ; on high ridge between Cliff
Creek and Deer Canyon (tributaries Kaweah River). Ileadwaters South Fork of Kaweah
River. San Gabriel National Forest, summits of eastern part, at 8,000 to 10,000 feetrarely
down to 3,000 feet or up to 10,400 feet. San Bernardino National Forest, summits
of eastern part, mainly above 8,500 feet-rarely down to 6,900: in this Forest,
known on Grayback Mountain, Big Bear Valley, Bluff Lake, ridge between Santa Ana
Canyon and Bear Lake, and Bear Creek Meadows. San Jacinto Mountains, above 9,500
feet on west slope, and above 7,000 feet on east slope. Only on San Jacinto and
Tahquitz peaks; noted in Round Valley, between Deer Springs and San Jacinto Peak,
between latter and Marion peaks at over 10,000 feet elevation.
LowEn CALIFORNIA.-Northern part of Mount San Pedro Martir at about 8,500 feet.
East of the Pacific region, this pine ranges from northern Idaho and Montana
southward through Wyoming, Utah, and western Colorado, also in the Black
Hills of South Dakota, and will be dealt with in a future publication.
OCCURRENCE.
On high plateaus and benches in vicinity of streams, mountain meadows,
on
and
broad
lakes,
ridges, and on long, gentle slopes and bottoms of stream basins.
slopes
North and
are more
east
favorable than west slopes, while south slopes, except in sheltered
are least
coves,
favorable. Especially abundant In Sierras about mountain meadows
The typical
and lakes.
coast form (commonly distinguished as Pinus contorte) occurs on
in
sea
sand
coast
dunes and barrens and sometimes about tide pools and swamps. Adapted
dry, gravelly
to
soils, but prefers sandy, moist ones of gentle slopes, depressions
teaus,
and
where
pla-
the largest growth occurs. Stunted forms grow persistently,
crevices
however,
of solid
in
rock throughout head basins of nearly all Sierra streams. It avoids
limestone.
In Sierras it forms extensive pure forests, particularly about meadows,
higher,
while
rocky,
on
broken ground it is associated mainly with Jeffrey pine, red fir,
ern
and
white
west-
pine, and sparingly with black hemlock and aspen. At high elevations in Oregon,
with Douglas fir, alpine fir, straggling noble and amabilis firs.
CLIMATIC CONDITIONS.-Apparently intermediate in requirements between Douglas
and
fir
Engelmaun spruce, Demands more moisture in soil and air and a lower average