Systematics/Phytogeography / Taxonomie/ Section
Refulio-Rodriguez, Nancy F. , Olmstead, Richard .
The lamiales, a well supported clade of asterid families, consist of ca. 22,000 species and 20 families. Molecular studies including Lamiales and using few genes have shown limited resolution in Lamiales phylogeny. Although within Lamiales most families are well supported, the relationships among them are unclear because of the low support values. In order to improve resolution in the Lamiales phylogeny we are gathering DNA sequences from several chloroplast genes (atpB, matK, ndhF, psbBTNH, rbcL, rps4, rps16, trnL-F, and trnV) and a mitochondrial gene (rps3). Also, we are expanding the sampling in contrast to previous studies. Data are still being gathered, however, preliminary parsimony analyses of all the genes combined show an increase in resolution and support for a series of basal stem lineages (Plocospermataceae, Oleaceae, Tetrachondraceae, Gesneriaceae + Calceolariaceae, Veronicaceae, Scrophulariaceae s.s.). However, the crown Lamiales still remain incompletely resolved. A group comprising Orobanchaceae, Phrymaceae, Paulowniaceae, Lamiaceae and a few unassigned genera is emerging as a clade, but its relationship to Bignoniaceae, Verbenaceae, Acanthaceae, Pedaliaceae, and Stilbaceae remain unclear.
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1 - University of Washington, Department of Biology, Hitchcock Hall Rm 423, Seattle, WA, 98195-5325, USA
Presentation Type: Oral Paper:Papers for Sections
Date: Wednesday, July 30th, 2008
Time: 8:45 AM