Systematics Section / ASPT
Rothacker, Erik Paul , Freudenstein, John .
Base of confusion; basal relationships of Epidendroideae (Orchidaceae).
THE largest orchid subfamily, the Epidendroideae exemplifies the primary radiation of Orchidaceae. While the higher level relationships among the Orchidaceae are stabilizing, tribal relationships among the basal epidendroids have yet to be fully elucidated. For this study, three genes representing each genome were sequenced: ITS, trnL-F, and nad1. A parsimony analysis was performed on each of the data sets and the combined dataset. Given the significant sequence length variation present in nad1, gap characters were coded and evaluated for phylogenetic utility. The monophyly of the Neottieae (+ Palmorchis) and Triphoreae (Triphora, Psilochilus and Monophyllorchis) is supported. Neottieae +Palmorchis are sister the rest of the Epidendroideae, with the leafless habit evolving at least 3 times in this group. Within the Triphoreae, it is evident that the predominately tropical tribe invaded the northern temperate areas of its range.
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1 - Ohio State University, Department of Evolution, Ecology and Organismal Biology, Museum of Biological Diversity, 1315 Kinnear Rd., Columbus, Ohio, 43212, USA
Presentation Type: Oral Paper:Papers for Sections
Date: Wednesday, August 2nd, 2006
Time: 9:30 AM