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Chemical Documentation of Allopatric Introgression in Juniperus

R. H. Flake, L. Urbatsch and B. L. Turner
Systematic Botany
Vol. 3, No. 2 (Summer, 1978), pp. 129-144
DOI: 10.2307/2418308
Stable URL: http://www.jstor.org/stable/2418308
Page Count: 16
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Chemical Documentation of Allopatric Introgression in Juniperus
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Abstract

Allopatric introgression, according to Edgar Anderson, is a potent source of variation and evolution in nature, Nevertheless, in spite of claims to the contrary, reliable documentation of this phenomenon in plants has not been forthcoming. In the present study, we examine chemical data from volatile extracts of leaf foliage obtained from an array of populations of Juniperus virginiana and J scopulorum extending along a transect from near St. Louis, Missouri, to the vicinity of Missoula, Montana. Detailed analyses of these populational samples strongly suggest that the variation found in J virginiana across the Missouri River Basin is due to allopatric introgression from its more western cohort, J. scopulorum.

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