Systematics/Phytogeography / Taxonomie/ Section
Redden, Karen M. , Herendeen, Patrick S. , Wurdack, Kenneth , Bruneau, Anne .
Phylogeny of the Brownea Clade (Leguminosae: Caesalpinioideae): genera, species and hybridization.
The Brownea Group (Leguminosae: Caesalpinioideae: Detarieae) as traditionally circumscribed contains nine genera. Previous morphological and molecular phylogenetic analyses found that most of these genera form a monophyletic group, the Brownea clade, that includes Brachycylix, Brownea, Browneopsis, Heterostemon, Ecuadendron, Elizabetha, Paloue, Paloveopsis and part of Macrolobium. Our most recent phylogeny of the Brownea clade based on 125 morphological characters and sequence data from the plastid trnL intron and nuclear ITS regions confirmed the monophyly of this clade and found that the monophyletic genus Macrolobium is included in this clade. However, generic and species boundaries of some taxa were unclear. The results of this study necessitated further examination of intergeneric and species-level hybridization issues. To date, we have identified two hybrids between species of Elizabetha and Paloue; one a recent collection made in 2007. We cloned multiple copies of ITS from these hybrids, which sorted with their putative parents suggesting a recent origin of these hybrids. Here we present these results and examine the utility of low copy nuclear genes for species-level delimitations in this clade. Combining these data with data from morphology, trnL intron and ITS sequences we provide a more comprehensive phylogenetic hypothesis for the Brownea clade.
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1 - George Washington University, Department of Biological Sciences, Lisner Hall 340, 2023 G Street, NW, Washington, DC, 20052, USA
2 - George Washington University, Biological Sciences, 2023 G St.NW, Washington, DC, 20052, USA
3 - Smithsonian Institution, Botany Department, PO Box 37012, NMNH, MRC-166, Washington, DC, 20013-7012, USA
4 - Institut de recherche en biologie végétale, Université de Montréal (Département de biologie), 4101 Sherbrooke Est, Montréal, Québec, H1X 2B2, Canada
Presentation Type: Oral Paper:Papers for Sections
Date: Tuesday, July 29th, 2008
Time: 8:45 AM