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Hybridization between Arctostaphylos viscida and A. canescens in Oregon

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Abstract

Evidence of natural hybridization betweenArctostaphylos viscida andA. canescens in southwestern Oregon was obtained from morphological studies of field populations. Hybridization occurs where populations ofA. viscida andA. canescens meet in areas where serpentine and nonserpentine soils abut. At these contacts,A. viscida forms large populations only on serpentine andA. canescens only on nonserpentine. Most of the indentifiable hybrids survive on either transitional or nonserpentine soils. The small proportion that are found on serpentine are considered to be backcrosses toA. viscida. The hybrid plants are similar to several putative species maintained in the standard floras, and it is suggested that these no longer be given taxonomic recognition.

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Authors and Affiliations

  1. Dept. of Botany, University of Michigan, Ann Arbor

    Leslie D. Gottlieb

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  1. Leslie D. Gottlieb
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Based on a thesis submitted to Oregon State University in partial fulfillment of the requirements for the M.S. degree.

This work was done in the Department of Botany, Oregon State University, Corvallis.

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Gottlieb, L.D. Hybridization between Arctostaphylos viscida and A. canescens in Oregon. Brittonia 20, 83–93 (1968). https://doi.org/10.2307/2805463

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