Systematics/Phytogeography / Taxonomie/ Section
Bacon, Christine D. , Simmons, Mark P. , Archer, Robert H. .
Phylogeny of the Madagascan Celastraceae sensu stricto Inferred from Morphological Characters and Nuclear and Plastid Genes.
Madagascar is a unique hotspot of Celastraceae diversity with 19 described genera, of which six are endemic to the island. In tandem with a revision of the Madagascan Celastraceae sensu stricto (not including Hippocrateaceae), we inferred their phylogenetic relationships in the context of extensive taxon sampling of African and Australian Celastraceae by using morphological characters together with nuclear (ITS and 26S rDNA) and plastid (matK and trnL-F) genes. Our results indicate that there are several separate Celastraceae lineages in Madagascar that are each more closely related to non-Madagascan taxa than they are to each other. Brexia and Polycardia are a single lineage, which was unexpected based on their highly divergent morphologies. The clade of Brexia and Polycardia is sister to the clade of Elaeodendron and Pleurostylia. Brexiella and Evonymopsis are not distinct genera, as has been previously hypothesized. The new monotypic genus Pseudocatha is more closely related to Elaeodendron than it is to Catha, contra our hypothesis.
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1 - Colorado State University, Biology, Fort Collins, CO, 80524-1878, USA
2 - Colorado State University, Department of Biology, Fort Collins, Colorado, 80523-1878, USA
3 - South African National Biodiversity Institute, National Herbarium, Private Bag X101, Pretoria, 001, Republic of South Africa
Presentation Type: Oral Paper:Papers for Sections
Date: Tuesday, July 29th, 2008
Time: 1:15 PM