Author: Barnes, Burton V.

Source: Forest Science, Volume 21, Number 3, 1 September 1975 , pp. 319-328(10)

Publisher: Society of American Foresters

Abstract:

Phenotypic variation of leaf, bud, and twig characters was investigated in 1,257 trembling aspen clones at 206 locations in 7 states and 1 Canadian province. Early leaves from seasonally determinate shoots of the lower crown were sampled to minimize intraclonal variation. Univariate and multivariate analyses revealed a clinal south-north gradient in leaf shape, size, and tooth number from southern Utah to northern Montana and Idaho. Nearly all clones had pubescent buds and shoots; these characteristics were most pronounced in Vancouver Island populations. Leaves from the Colorado and Columbia Plateaus closely resembled leaves of fossil Pliocene and Miocene aspens. Clones from these mostly unglaciated areas are larger than those in the northern part of the study area. Forest Sci. 21:319-328.

Keywords: Multivariate analysis; paleobotany; morphology; Populus tremuloides; plant geography

Document Type: Journal article

Affiliations: 1: Professor of Forestry, School of Natural Resources, University of Michigan, Ann Arbor, Michigan

Publication date: 1975-09-01

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