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

FOREST TREES OF THE PACIFIC SLOPE.
California, it extends east of Sierras into Nevada. In Plumas and Sierra counties, and
generally in eastern Californian and trans-Sierran regions, it occurs at 5,000 and 8,800
feet throughout main and secondary ranges north of Sierra Valley; also in a narrow
fringe at lowest levels east and south of this valley, as well as throughout Truckee River
basin, except region around lakes Tahoe, Independence, Webber, and Donner; reaches
western limits on summits of Grizzly Mountains, mountains west of Summit City, and
canyon of South Fork of Yuba River. Locally noted in northeastern Shasta County,
about Dana, head of Fall River, Bald Mountain (south of Fall River) ; northeast Lassen
County western edge (5 miles west of Bieber) and eastern third of Big Valley and
northward to Adin; about Susanville (southern Lassen County), at 4,500 feet, and east
of Long Valley (south of Honey Lake) ; borders of Sierra Valley (Plumas and Sierra
counties), at 3,600 feet; Feather River at Otis Ranch; from Sierraville to Loyalton;
Rubicon River, 1 mile above Rubicon Springs; Canyon South Fork American River, 1
mile above Strawberry. Southward in Stanislaus National Forest, confined to summits
of Sierras, at 7,000 to 8,500 feet. Here locally noted as follows : Donner Peak, at 7,000
to 8,300 feet (Placer County) ; Little Truckee-south of Lake Tahoe, Glen Alpine Canyon,
and Loon Lake (Eldorado County) ; Twin Lakes (11 miles west of Woods Ranch), at
9,000 feet; Hope Valley; Upper West Carson River Canyon; upper Silver Creek to Mokelumne
Pass, and upper Mokelumne River (Alpine County) ; head of North Fork of
Mokelumne River and Hermit Valley (on latter stream) ; west side of Sonora Pass, at
8,000 feet, and westward to Eureka Valley, at 6,000 feet; Tuolumne Meadows, Mount
Lyell, Lyell Canyon, Unicorn Peak, Lambert Dome, Tenaya Nunitak, Tenaya Canyon.
Grand Canyon of Tuolumne River, slope west of Lake Tenaya, Overhang Rock (between
Tenaya and Snow Flat), and Cathedral Peak (Tuolumne County) ; Yosemite National
Park, at head of Nevada Fall, at 6,000 feet, thence on trail from Little Yosemite to
Cathedral Lakes, at 6,300 to 6,400 feet; 4 miles north of Dardanelles; Pacific Valley;
Mokelunne Peak; Lily Creek (branch Middle Fork of Stanislaus River) ; Mount Reba,
at 8,000 to 10,000 feet. On east slope of Sierras, common above Jeffrey pine at high
elevations; noted in West Walker Canyon (Mono County) between Antelope Valley and
Bridgeport; east side Bridgeport Valley; canyon southeast of Bridgeport Meadows, and
thence southward to Mono Lake, hills about Long Valley, Sonora Pass, and down to
8,200 feet; Mono Pass in Bloody Canyon, Rock Creek (tributary Owens River). Abundant
on ridges and summits in Sierra National Forest at 6,000 to over 10,000 feet elevation.
Locally noted on headwaters of South Fork of San Joaquin River and its tributaries,
Mono and Bear creeks; Kings River Basin on its North, Middle, and South forks, at
9,500 to 10,600 feet; Woodchuck Creek (tributary North Fork), Horse Corral Meadows
(head of Kings River), Bubbs Creek (tributary South Fork) ; Kaweah River watershed,
head of its East Fork, at 9,000 to 10,200 feet from Mineral King to Farewell Gap;
Granite Mountain (head of East Fork), at 10,600 feet; head of Deer Creek (tributary
Middle Fork) ; Kern River watershed, Whitney Creek at " Tunnel," headwaters of South
Fork, Little Kern River (below Farewell Gap), and thence to North Fork; also near
mouths of east and west forks. Abundant on Rock Creek (tributary Owens River).
Reported on Panamint Mountains (east of Sierras) on north slope of Telescope Peak, at
9,300 feet, far above J. utahensis, upper limit of which is 8,400 feet. San Bernardino
Mountains, higher parts up to 9,500 feet; locally noted on Mount San Antonio at about
10,000 feet, and in Bear Valley, at 6,700 feet; on north side of Holcomb Valley, at
6,700 feet, and near divide between Holcomb Creek and Mohave Desert, at 7,000 feet.
Extreme southern range not determined; possibly extends through San Jacinto
Mountains and southward to Mount San Pedro Martir, northern Lower California, where
it has been reported at 5,000 to 7,000 feet elevation.
The distribution of this tree in the northern Rocky Mountains will be given
in a future publication.
OCCURRENCE.
Exposed high mountain slopes and canyon sides, in dry gravelly and rocky soils, sometimes
in crevices of rock. In very open, but practically pure stands, or scattered among
Jeffrey and lodgepole pines.
CLIMATIC CONDITIONs.-Simillar to those of Jeffrey pine.
TOLERANCE.-Imperfectly known. Appears to be decidedly intolerant of shade in all
stages of growth; always grows In full light.
REPRODUCTION.-Very abundant seeder, but seedlings are only occasional and scattered
In pure mineral soil.
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