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UBC Theses and Dissertations
Systematics of Saxifraga rufidula and related species from the Columbia River gorge to southwestern British Columbia Perkins, Walter Ethen
Abstract
In the Pacific Northwest, hybridization and polypoid variation have produced confusion in the relationships among Saxifraga rufidula (Small) James Macoun and its relatives. The entities from the Columbia River Gorge are particularly difficult to separate taxonomically. Some authors have recognized several species from that area while others recognize one highly variable, widely distributed species with varietal components. The present study approached the systematic treatment of S. rufidula and related subspecific taxa of S. occidentalis Wats. with data from numerical studies, studies of meiosis, observations of artificial and natural hybrid individuals and populations, breeding system experiments, observations of pollinators, and ecological observations. Polyploid intermediates and plants with introgressant characteristics are shown to occur, many of which appear to be the result of hybridization with the S. integrifolia species complex. Sufficient correlations of morphological, ecological and geographic discontinuities exist to substantiate the treatment of S. rufidula. S. occidentalls var. latipetiolata, S. occidentalis var. dentata, and S. occidentalis var. occidentalis as a species. According to the rules of nomenclature S. rufidula becomes S. aeguidentata. S. occidentalis var. latipetiolata becomes S. latipetiolata, S. occidentalis var. dentata becomes S. gormanii. and S. occidentalis var. occidentalis becomes S. occidentalis.
Item Metadata
Title |
Systematics of Saxifraga rufidula and related species from the Columbia River gorge to southwestern British Columbia
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1978
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Description |
In the Pacific Northwest, hybridization and polypoid variation have produced confusion in the relationships among Saxifraga rufidula (Small) James Macoun and its relatives. The entities from the Columbia River Gorge are particularly difficult to separate taxonomically. Some authors have recognized several species from that area while others recognize one highly variable, widely distributed species with varietal components. The present study approached the systematic treatment of S. rufidula and related subspecific taxa of S. occidentalis Wats. with data from numerical studies, studies of meiosis, observations of artificial and natural hybrid individuals and populations, breeding system experiments, observations of pollinators, and ecological observations. Polyploid intermediates and plants with introgressant characteristics are shown to occur, many of which appear to be the result of hybridization with the S. integrifolia species complex. Sufficient correlations of morphological, ecological and geographic discontinuities exist to substantiate the treatment of S. rufidula. S. occidentalls var. latipetiolata, S. occidentalis var. dentata, and S. occidentalis var.
occidentalis as a species. According to the rules of nomenclature S. rufidula becomes S. aeguidentata.
S. occidentalis var. latipetiolata becomes S. latipetiolata, S. occidentalis var. dentata becomes S. gormanii. and S. occidentalis var. occidentalis becomes S. occidentalis.
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Type | |
Language |
eng
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Date Available |
2010-03-01
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0094491
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Affiliation | |
Degree Grantor |
University of British Columbia
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.