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UBC Theses and Dissertations
Floret development and embryology of Oryzopsis hendersoni (Gramineae) Mehlenbacher, Lyle Eugene
Abstract
Previous research has shown, that Orysopsis hendersoni shares two features with Stipa and one with Oryzopsiso. A study of floret development and embryology was undertaken in order to obtain more points for comparison. Most of the twenty-six features of O. hendersoni resulting from this study are characteristic of Stipa and not Oryzopsisa. Therefore, it is proposed that O. hendersoni be transferred to Stipa. Evidence from this and other studies demonstrates that grass locidules can be foliar, stamen-like, or intermediate and that the gynoecium is unicarpellate. These facts are contradicted by claims of homology based on hypothetical phylogenies. Because use of the concept of homology has led to general acceptance of misleading assumptions in these and other instances and because the concept of homology is ambiguous and superfluous, it should not be used.
Item Metadata
Title |
Floret development and embryology of Oryzopsis hendersoni (Gramineae)
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1970
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Description |
Previous research has shown, that Orysopsis hendersoni shares two features with Stipa and one with Oryzopsiso. A study of floret development and embryology was undertaken in order to obtain more points for comparison. Most of the twenty-six features of O. hendersoni resulting from this study are characteristic of Stipa and not Oryzopsisa. Therefore, it is proposed that O. hendersoni be transferred to Stipa.
Evidence from this and other studies demonstrates that grass locidules can be foliar, stamen-like, or intermediate and that the gynoecium is unicarpellate. These facts are contradicted by claims of homology based on hypothetical phylogenies. Because use of the concept of homology has led to general acceptance of misleading assumptions in these and other instances and because the concept of homology is ambiguous and superfluous, it should not be used.
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Type | |
Language |
eng
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Date Available |
2011-05-19
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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 |
10.14288/1.0102142
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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.