Systematics of Saxifraga rufidula and related species from the Columbia River gorge to southwestern British Columbia
department or school: Science, Faculty of
department or school: Botany, Department of
data provider: DSpace
degree campus: UBCV
creator: Perkins, Walter Ethen
issued: 2010-03-01T22:34:26Z
issued: 1978
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
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.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/21272
note: SYSTEMATICS OF SJ^IFRJGA BOFIDULJ AND BELATED SPECIES FBCM THE COLOMBIA BIVEB GOBGE TO SOUTHSESTEBN BBITISH COIUUBIA By HALTER ETHEN PERKINS B.Sc. , U n i v e r s i t y o f Oklahoma, 1S73 A THESIS SUBMITTED IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOB THE DEGREE OF DOCTOB OF PHILOSOPHY i n THE FACULTY OF GRADUATE STUDIES {Department of Botany) Se a c c e p t t h i s t h e s i s as conforming t o the r e q u i r e d s t a n d a r d THE UNIVERSITY OF BBITISH COLUMBIA Octo b e r , 1978 (8) W a l t e r Ethen P e r k i n s , 1978 In presenting this thesis in partial fulfilment of the requirements for an advanced degree at the University of British Columbia, I agree that the Library shall make it freely available for reference and study. I further agree that permission for extensive copying of this thesis for scholarly purposes may be granted by the Head of my Department or by his representatives. It is understood that copying or publication of this thesis for financial gain shall not be allowed without my written permission. W. E t h e n P e r k i n s Department of Botany The University of British Columbia 2075 Wesbrook Place Vancouver, Canada V6T 1W5 5 O c t o b e r , 1978 R e s e a r c h S u p e r v i s o r : D r . R a t h e r i n e I . Beamish. ABSTRACT I n t h e P a c i f i c Northwest, h y b r i d i z a t i o n and p o l y p o i d v a r i a t i o n have produced c o n f u s i o n i n the r e l a t i o n s h i p s among S a x i f r a g a r u f i d u l a (Small)James Macoun and i t s r e l a t i v e s . The e n t i t i e s from t h e Columbia B i v e r Gorge a r e p a r t i c u l a r l y d i f f i c u l t t o s e p a r a t e t a x o n c m i c a l l y . , Some a u t h o r s have r e c o g n i z e d s e v e r a l s p e c i e s from t h a t area w h i l e o t h e r s r e c o g n i z e one h i g h l y v a r i a b l e , w i d e l y d i s t r i b u t e d s p e c i e s w i t h v a r i e t a l components. The p r e s e n t s t u d y approached t h e s y s t e m a t i c t r e…
has type: Thesis/Dissertation
is shown at: 10.14288/1.0094491
language: eng
degree discipline: Botany
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
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.
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/21272