A MONOGRAPHIC REVISION OF THE GENERA SYNTHYRIS AND BESSEYA (SCROPHULARIACEAE) (SYSTEMATICS TAXONOMY).
Year of Award
Doctor of Philosophy (PhD)
Other Degree Name/Area of Focus
Department or School/College
Department of Botany
Sherman J. Preece
Snapdragons, Plants Classification
University of Montana
Data derived from morphology, chromatography of flavonoids, artificial hybridizations, cytology, comparisons of corolla vasculature and transplant and field observations were used to establish generic bounds, delimit the natural biologic units and suggest the evolutionary trends and mechanisms responsible for the taxa housed in Synthyris and Besseya. The idea that Synthyris and Besseya were congeneric based on the occurrence of a natural intergeneric (_B. rubra 9 x S major &) hybrid was addressed both in the laboratory and in the field. Intergeneric hybrids were found to be poorly represented in the hybrid population, weak, transitory and of very low pollen viability (average 6.53%) As hybridization is restricted to a unique site near Kamiah, Idaho, and introgression is unknown, this phenomenon is not considered evidence for generic consolidation. Data from morphology, corolla vasculature, flavnonoid chromatography and artificial hybridizations support generic segregation. Reasons for restricted hybridization and lack of introgression were investigated.
Schaack, Clark G., "A MONOGRAPHIC REVISION OF THE GENERA SYNTHYRIS AND BESSEYA (SCROPHULARIACEAE) (SYSTEMATICS TAXONOMY)." (1983). Graduate Student Theses, Dissertations, & Professional Papers. 10160.
© Copyright 1983 Clark G. Schaack