ill.; Report title; "A report to the Superintendent, Crater Lake National Park, March 1982." - T.p.; Includes bibliographical references (p. 11-16)
A REVIEW OF THE TAXONOMIC STATUS OF PINES INCLUDING TRUE FIRS WITHIN THE PINUS PONDEROSA FOREST IN THE SOUTHERN PORTION OF CRATER LAKE NATIONAL PARK, OREGON (A Report to the Superintendent, Crater Lake National Park, March 1982) R. J. Mastrogiuseppe ABSTRACT The taxonomic status of pines within the old-growth Pinus ponderosa forest in the southern portion of Crater Lake National Park has been questioned. Specific observations and measurements of morphological features of both ovulate cones and needles suggest an intergrading of £. jeffreyi; however, no known £. jeffreyi occur in the park or immediate vicinity. When both P. ponderosa and £. jeffreyi occur in wild populations, hybridity is known to be a rare event. Comparison of a univariate trait (mean rows of needle stomata) in a computer clustering analysis revealed that three of five unclassified Crater Lake samples were most similar to £. washoensis. The remaining two were similar to several combinations of £. jeffreyi x £. ponderosa subsp. ponderosa hybrids. Also, a literature review suggests that a strong washoensis element exists within the local Cascadian, eastside population. According to the Haller hypothesis, £. washoensis (a high elevation form of northwestern £. ponderosa = JP. ponderosa subsp. washoensis) is more similar to £. jeffreyi than to any other variant; however, £. Jeffrey and £. washoensis are relatively intersterile. Ecological implications of the washoensis variant may account for the persistence of small groups of £. ponderosa at high elevations near Crater Lake's caldera rim, and summit craters of cinder cones both within and near the park. INTRODUCTION Recently, interest has arisen in the possible occurrence of hybrids between Pinus ponderosa and £. jeffreyi in the southern portion (Sun Creek watershed) of Crater Lake National Park. Evidence acquired to support this view is from observations and measurements of three characteristics of cone and foliage material. These measurements were ovulate cone length, the orientation of the cone scale armature or spine (prickle), and the numbers of stomatal bands on both ventral and dorsal surfaces of needles. A total of 50 needles were examined (numbers of sample trees unknown) and nine ovulate cones were studied 1. Present mailing address: 2750 Sunny Grove Avenue, Areata, California 95521
A REVIEW OF THE TAXONOMIC STATUS OF PINES INCLUDING TRUE FIRS WITHIN THE PINUS PONDEROSA FOREST IN THE SOUTHERN PORTION OF CRATER LAKE NATIONAL PARK, OREGON (A Report to the Superintendent, Crater Lake National Park, March 1982) R. J. Mastrogiuseppe ABSTRACT The taxonomic status of pines within the old-growth Pinus ponderosa forest in the southern portion of Crater Lake National Park has been questioned. Specific observations and measurements of morphological features of both ovulate cones and needles suggest an intergrading of £. jeffreyi; however, no known £. jeffreyi occur in the park or immediate vicinity. When both P. ponderosa and £. jeffreyi occur in wild populations, hybridity is known to be a rare event. Comparison of a univariate trait (mean rows of needle stomata) in a computer clustering analysis revealed that three of five unclassified Crater Lake samples were most similar to £. washoensis. The remaining two were similar to several combinations of £. jeffreyi x £. ponderosa subsp. ponderosa hybrids. Also, a literature review suggests that a strong washoensis element exists within the local Cascadian, eastside population. According to the Haller hypothesis, £. washoensis (a high elevation form of northwestern £. ponderosa = JP. ponderosa subsp. washoensis) is more similar to £. jeffreyi than to any other variant; however, £. Jeffrey and £. washoensis are relatively intersterile. Ecological implications of the washoensis variant may account for the persistence of small groups of £. ponderosa at high elevations near Crater Lake's caldera rim, and summit craters of cinder cones both within and near the park. INTRODUCTION Recently, interest has arisen in the possible occurrence of hybrids between Pinus ponderosa and £. jeffreyi in the southern portion (Sun Creek watershed) of Crater Lake National Park. Evidence acquired to support this view is from observations and measurements of three characteristics of cone and foliage material. These measurements were ovulate cone length, the orientation of the cone scale armature or spine (prickle), and the numbers of stomatal bands on both ventral and dorsal surfaces of needles. A total of 50 needles were examined (numbers of sample trees unknown) and nine ovulate cones were studied 1. Present mailing address: 2750 Sunny Grove Avenue, Areata, California 95521