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UBC Theses and Dissertations
Taxonomic study of Trillium ovatum forma hibbersonii O’Neill, Darlene, M.
Abstract
The entity known as Trillium ovatum forma hibbersonii Taylor and Szczawinski was first discovered on the west coast of Vancouver Island in 1938 by JA. Hibberson (Holotype UBC 73131). Leonard Wiley invalidly published the taxon as Trillium hibbersonii in 1968. A review of the taxonomic status by T.M.C. Taylor and A.F. Szczawinski resulted in the publication of the taxon as Trillium ovatum forma hibbersonii (1975). The diagnosis stated this dwarf variant was part of the continuous series of intergradations of Trillium ovatum Pursh (Taylor and Szczawinski, 1975). Taylor and Szczawinski did not cite any small or intermediate samples that supported their conclusions. The present study was initiated to provide a comprehensive re-evaluation of the taxonomic status: separate species from Trillium ovatum; subspecies, variety or forma of Trillium ovatum? This study considers morphological differences, flavonoid analysis and Random Amplified Polymorphic DNA (RAPD), from natural populations and cultivated plants. I conclude that compelling evidence supports the raising of Trillium ovatum forma hibbersonii to specific status. Characteristics which support this conclusion are: 1) the limited geographical distribution of Trillium ovatum forma hibbersonii 2) different ecological niche and strong morphological divergence from Trillium ovatum 3) distinct dormancy/germination requirements 4) quantitative differences in the major flavonoid constituents of T. ovatum and T. ovatum forma hibbersonii
Item Metadata
Title |
Taxonomic study of Trillium ovatum forma hibbersonii
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1995
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Description |
The entity known as Trillium ovatum forma hibbersonii Taylor and Szczawinski was first
discovered on the west coast of Vancouver Island in 1938 by JA. Hibberson (Holotype UBC
73131). Leonard Wiley invalidly published the taxon as Trillium hibbersonii in 1968. A
review of the taxonomic status by T.M.C. Taylor and A.F. Szczawinski resulted in the
publication of the taxon as Trillium ovatum forma hibbersonii (1975). The diagnosis stated
this dwarf variant was part of the continuous series of intergradations of Trillium ovatum
Pursh (Taylor and Szczawinski, 1975). Taylor and Szczawinski did not cite any small or
intermediate samples that supported their conclusions.
The present study was initiated to provide a comprehensive re-evaluation of the taxonomic
status: separate species from Trillium ovatum; subspecies, variety or forma of Trillium
ovatum?
This study considers morphological differences, flavonoid analysis and Random Amplified
Polymorphic DNA (RAPD), from natural populations and cultivated plants.
I conclude that compelling evidence supports the raising of Trillium ovatum forma
hibbersonii to specific status. Characteristics which support this conclusion are:
1) the limited geographical distribution of Trillium ovatum forma hibbersonii
2) different ecological niche and strong morphological divergence from Trillium ovatum
3) distinct dormancy/germination requirements
4) quantitative differences in the major flavonoid constituents of T. ovatum and T. ovatum
forma hibbersonii
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Extent |
9391682 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-02-05
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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 |
10.14288/1.0087047
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1996-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
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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.