Systematics/Phytogeography / Taxonomie/ Section
Hoot, Sara B. , Wulff, Jason A. , Neves, Susana S. .
Phylogeny of Ranunculales based on multiple sequence data and morphology.
Ranunculales are a highly diverse order that, along with such groups as the Proteales, are at the base of the eudicots. Some of the genera (e.g., Pteridophyllum, Circaeaster, Kingdonia) appear to be relict taxa, representatives of lineages which may have been more speciose in the past; others contain numerous and morphologically diverse species (e.g., Menispermaceae, Ranunculaceae). We present a phylogeny for Ranunculales that considerably expands the sampling (82 genera) and regions sequenced (chloroplast atpB, rbcL, and matK to date; nuclear 26S and mitochondrial rps11 to be included in the future) in a single analysis. Branching patterns within the order are well resolved and supported (bootstrap support ≥ 70), especially along the backbone of the tree. Both molecular and morphological data suggest that Papaveraceae s.l. may be better recognized as four families, Pteridophyllaceae, Hypecoaceae, Fumariaceae, and Papaveraceae, as is found in some previous classifications. The relationship of Circaeasteraceae as sister to Lardizabalaceae is well supported; this clade is in turn sister to a group consisting of Menispermaceae, Berberidaceae, and Ranunculaceae. Berberidaceae and Ranunculaceae are resolved as highly supported sister groups. Resolution at the familial level is highly congruent with previous work, including studies that include greater sampling. The only family lacking substantial resolution is Ranunculaceae. The addition of morphological data to our DNA sequence data improves resolution and branch support, especially of Ranunculaceae. For example, characters related to trichome type, leaf micromorphology, and cytology are especially useful within Ranunculaceae. The direction of evolution for a few key morphological characters will be discussed.
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1 - University of Wisconsin-Milwaukee, Department of Biological Sciences, P.O. Box 413, Milwaukee, Wisconsin, 53201, USA
2 - University of Wisconsin, Biological Sciences, PO Box 413, Milwaukee, WI, 53201, USA
3 - Universidade Nova De Lisboa, Instituto de Tecnologia Química e Biológica, Av. Da Republica -Apartado 127, Oeiras, 2781-901, Portugal
Presentation Type: Oral Paper:Papers for Sections
Location: Room 6/Woodward
Date: Tuesday, July 29th, 2008
Time: 11:15 AM