Systematics Section / ASPT
Parks, Margaret , Fishbein, Mark .
Preliminary Phylogeny of Southeastern United States Matelea Species.
Matelea (Apocynaceae) is a genus of over one hundred species of mostly twining vines found in tropical and subtropical North and South America. In the southeast United States, eight species are found, and of these, six are in need of taxonomic revision. Within the Gonolobinae, the subtribe to which Matelea belongs, genera are not cleanly delimited, and morphological features defining genera are few. A phylogenetic analysis of Matelea, and the Gonolobinae as a whole, has never been conducted. Thus, there exists a great deal of controversy over the circumscription of these species. A phylogeny of southeastern Matelea was inferred from rpoB-trnC intergenic spacer and rpl16 intron sequences. Taxon sampling included 25 species of Matelea, as well as species of Gonolobus, Pherotrichus, Schubertia, and Macroscepis. Hypotheses tested with this data set included the monophyly of southeastern Matelea, as well as the monophyly of Matelea and Gonolobus. Results support the monophyly of southeastern Matelea and Gonolobus. Most Matelea are placed in a single clade; Pherotrichus may belong to the same clade. In addition, the closest relatives to southeastern Matelea in the data set are identified.
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1 - Mississippi State University, Department of Biological Sciences, P. O. Box GY, Mississippi State, Mississippi, 39762
Presentation Type: Oral Paper
Location: Salon G - Austin Grand Ballroom/Hilton
Date: Wednesday, August 17th, 2005
Time: 3:15 PM