Pais, Andrew , Guo, Yuelong , Weakley, Allen , Xiang, Qiuyun (Jenny) .
Resolving the relationship between Carpentaria and Mock Oranges: Is Philadelphus a monophyletic genus?
Since Hu's morphological and largely comprehensive description of Philadelphus in 1956, there have been rapid changes in consensus regarding the relationships within the Mock Orange genus. Recent molecular evidence has even challenged the monophyletic nature of the genus itself. Weakley et al. (2002) first suggested that Carpentaria was nested within Philadelphus, positing that the sensu stricto classification of the latter should be revised. We initiated a test of this hypothesis by comparing five different regions of nuclear and chloroplast DNA for the taxa of interest. The results of these phylogenetic analyses dissolved the previously established monophyletic nature of Philadelphus and Subg. Duetzioides by nesting Carpentaria in between Subg. Duetzioides and Subg. Philadelphus and by relocating P. hirsutus from Subg. Duetzioides to Subg. Philadelphus. The results also indicated that Hu's subgenera, sections, and series within Philadelphus may be in need of reorganization. In addition, divergence time dating and biogeographic analysis suggested an origin of the Philadelphus-Carpenteria complex in the Oligocene in southwestern America. Due to a relatively small sampling from the southwestern United States and Mexico (where the genus has its highest diversity) in the initial analysis, additional species have been sampled from these areas in order to test these findings. Further sampling of Carpentaria has also been conducted in addition to including Kirengeshoma as an out group for analyses. Such additional information has the potential to change our understanding of the relationships within and around the Mock Orange genus.
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Presentation Type: Oral Paper:Papers for Sections
Location: Franklin B/Hyatt
Date: Tuesday, July 10th, 2012
Time: 10:30 AM