Camacho, Francine , Pell, Susan K. , Mitchell, John D. , Atha, Daniel E. .
Phylogenetic analysis of Comocladia (Anacardiaceae) using chloroplast and nuclear sequence data.
The genus Comocladia contains ca. twenty species that are widely distributed in the Caribbean, northern Central America and Mexico. Species are shrubs or trees that are mostly unbranched and cause contact dermatitis. Phylogenetic data for the cashew family (Anacardiaceae) has previously indicated that the genus is monophyletic and sister to Metopium within a larger clade of other contact dermatitis causing genera. Limited Comocladia sampling in family level phylogenies and the recent discovery of a new Comocladia species in Belize and Guatemala led to an investigation of the phylogeny of this relatively unstudied genus. For this project, DNA was extracted from multiple samples of fourteen Comocladia species as well as eight samples of closely related genera. Sequence data from two genomes was utilized: cpDNA trnL-trnF and rps16, and nrDNA ETS and ITS. The resulting phylogenies add greater support for the monophyly of Comocladia and its sister relationship with Metopium. Preliminary data indicate that the new species is sister to the Mexican species, Comocladia engleriana, a finding consistent with the current geographical distribution of these two species, but somewhat surprising in a morphological context.
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1 - BASE High School and Brooklyn Botanic Garden, 1000 Washington Ave, Brooklyn, NY, 11225, USA
2 - Brooklyn Botanic Garden, 1000 Washington Ave, Brooklyn, NY, 11225, USA
3 - New York Botanical Garden, Institute of Systematic Botany, 200th St. and Southern Blvd, Bronx, NY, 10458, USA
4 - The New York Botanical Garden, 200th St. and Southern Blvd, Bronx, NY, 10458, USA
Presentation Type: Oral Paper:Papers for Sections
Location: 556B/Convention Center
Date: Wednesday, August 4th, 2010
Time: 3:15 PM