Thesis
Flag flower morphology and phylogeny of Hydrangeaceae tribe Hydrangeeae
Washington State University
Master of Science (MS), Washington State University
2010
Handle:
https://hdl.handle.net/2376/107071
Abstract
This study examines the phylogeny of Hydrangeaceae tribe Hydrangeeae and the morphology of flag flowers that are characteristic of their inflorescences. Phylogeny reconstructions tested previously hypothesized relationships in Hydrangeeae, a monophyletic group that consists of Hydrangea and allied genera. Phylogenetic analyses based on DNA sequences from nuclear ribosomal internal transcribed spacer regions and plastids indicated Hydrangea is paraphyletic to Broussaisia, Decumaria, Dichroa, Pileostegia, Platycrater and Schizophragma and possibly also to Cardiandra and Deinanthe. We recovered limited support for clades of Hydrangeeae that corresponded to groups circumscribed in earlier classifications. We examined the morphology of flag flowers of Hydrangeeae that have floral dimorphism. A survey of herbarium specimens to describe variation in flag flowers across the tribe as well as histological studies revealed that all have enlarged calyces, most have a corolla, androecium and gynoecium, although structures of the latter two series are often aberrant. Reductions were common among flag flowers and these usually involved the loss of androecial or gynoecial structures, although in taxa such as Deinanthe and Schizophragma the flag flowers consisted usually only of calyx.
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Details
- Title
- Flag flower morphology and phylogeny of Hydrangeaceae tribe Hydrangeeae
- Creators
- Sarah J. Jacobs
- Contributors
- Larry Hufford (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Biological Sciences, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; Pullman, Wash. :
- Identifiers
- 99900525102101842
- Language
- English
- Resource Type
- Thesis