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Variation in the Breeding System of Acer grandidentatum

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The breeding system of reproductively mature trees of Acer grandidentatum was investigated over two successive flowering years of contrasting precipitation and on sites with contrasting soil moisture in the same year. Two types of flowers and three sexual phenotypes were observed. The flowers were classified as male and female. The sexual phenotypes, in order of decreasing frequency, were (1) bisexual each year, (2) bisexual one year and unisexual with male flowers the other year, and (3) unisexual with male flowers each year. Trees with only male flowers were most numerous in the dry versus the wet year and in xeric versus mesic sites. Among trees with bisexual expression for either 1 or 2 years, those exposed to the driest environments had the lowest ratio of female to male flowers. Forest Sci. 28:563-572.

Keywords: Canyon maple; fruitlessness; mating systems; reproductive biology; sex expression; urban forestry

Document Type: Journal Article

Affiliations: Professor, Department of Botany and Range Science, Brigham Young University, Provo, UT 84601

Publication date: September 1, 1982

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