. Brigham Young University science bulletin. Biology -- Periodicals. BIOLOGICAL SERIES. VOL. 1 I, NO. 3 NATIVE TREES OF UTAH UTAH OUTLINE MAP. Fig. I 2. Pinus iiionophyHa Torr. & Frem. Pimts ponderosa Laws. (Fig. 13) Ponderosa pine is one of the most common con- ifers at elevations between 6,500 and feet in the mountains and plateaus of southern Utah. Al- thougli occasionally occurring in open park-like stands, it is commonly associated with other species such as Gambel oak, aspen, juniper, white fir, etc. Ponderosa pine is not present in the mountains of the basin and range province
. Brigham Young University science bulletin. Biology -- Periodicals. BIOLOGICAL SERIES. VOL. 1 I, NO. 3 NATIVE TREES OF UTAH UTAH OUTLINE MAP. Fig. I 2. Pinus iiionophyHa Torr. & Frem. Pimts ponderosa Laws. (Fig. 13) Ponderosa pine is one of the most common con- ifers at elevations between 6,500 and feet in the mountains and plateaus of southern Utah. Al- thougli occasionally occurring in open park-like stands, it is commonly associated with other species such as Gambel oak, aspen, juniper, white fir, etc. Ponderosa pine is not present in the mountains of the basin and range province of western Utah except for possibly two exceptions. It has been collected in the Wah Wah Mountains, and there is a specimen (USPS) collected in 1913 in Oak Creek Canyon, Canyon Mountains, by Bert L. Robins. This canyon is the site of a ponderosa pine plantation, but I did observe a few larger more isolated individual trees about one-fourth mile up the canyon. It is undetermined whether the older trees are natives to the canyon or remnants of earlier experimental planting. Ponderosa pine occurs only sporadically in the Wasatch Plateau of Sevier County and only in a few sites in the Wasatch Mountains of Utah County. How- ever, it is common at moderate elevations throughout the Uinta Basin. It has been collected on the north slope of the Uintas only in Daggett County. Why this species is absent from the northern Wasatch Range when it grows far to the north in Idaho and Montana is a most interesting problem that reflects the general distribution of this species in the West. Ponderosa pine is common from Arizona to Canada and from the Pacific coast to the Black Hills of South Dakota and Nebraska. It is absent from the central part of its range, namely in northern portions of Nevada and Utah and in southern regions of Idaho and Wyoming. No satisfactory answer has been found, although Baker and Korstian (1931) suggested that moisture deficiency early in the growing season might be a
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