Franck, Alan .
Phylogeny and biogeography of Harrisia (Family Cactaceae Juss.: Subfamily Cactoideae Eaton: Tribe Trichocereeae Buxbaum).
The cactus genus Harrisia comprises circa 21 species native to South America, the Caribbean, and Florida. As with much of the Cactaceae, taxonomic clarity within Harrisia has not been satisfactorily resolved. This study aims to resolve the taxonomy of Harrisia with DNA sequencing and morphological comparisons, seeking a phylogenetic monograph. Plastid loci have been useful between distantly-related taxa but less so among closely-related taxa. Sequences of nuclear ribosomal DNA have not been useful because of extensive intragenomic polymorphisms. Introns of low-copy nuclear loci may be more informative, such as nhx1 which exhibited polymorphisms among closely-related taxa. The results will be interpreted in the context of phylogeography, incorporating the history of the Caribbean islands, Florida, and South America. Wild populations, living collections, seed collections, and herbarium specimens are being used for analyses.
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1 - University of South Florida, Department of Biology, Sca 110, 4202 Fowler Avenue, Tampa, Florida, 33620-5150, USA
Presentation Type: Poster:Posters for BSA Sections
Location: Event Tent/Cliff Lodge
Date: Monday, July 27th, 2009
Time: 5:30 PM