Systematics Section / ASPT
Simpson, Beryl , Arroyo, Mary Kalin , Sipe, Sandra , McDill, Joshua .
Phylogeny and Biogeography of Perezia (Asteraceae: Mutisieae: Nassauviinae).
The genus Perezia traditionally consists of 30-33 species ranging from central Ecuador to Tierra del Fuego, primarily along the Andes. A previous monograph suggested that the genus arose in humid areas of the central Andes and spread south and east from there. Drying in the mid to late Tertiary led to a group of species in the southern Nothofagus forest and to a group of species in east-central South America. The major radiation resulting in the high number of species in the Andes was postulated to have been related to Pleistocene climatic events. Using molecular data, we are constructing a phylogeny of Perezia to examine these ideas. Results to date indicate that Perezia is paraphyletic to Nassauvia (including Triptilion) with the Nothofagus forest taxa sister to a clade of Nassauvia (+Triptilion) and the remaining Perezia species. The eastern South American species form a clade but the relationships of this clade to the Andean species and of the relationships among the Andean species themselves are currently unresolved. The controversial Perezia lanigera variously placed in, or excluded from, Perezia falls within Acourtia. Data to date suggest a southern South American origin of Perezia with high elevation central Andean taxa more derived.
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1 - University of Texas at Austin, Plant Resources Center and Section of Integrative Biology, 1 University Station A6720, Austin, Texas, 78712, USA
2 - Universidad de Chile, Facultad de Ciencias, Las Palmeras 3425, Nunoa, Santiago, Chile
3 - University of Texas Austin, Section of Integrative Biology, 1 University Station, C0930, Austin, Texas, 78712, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Lake Erie/Hilton
Date: Monday, July 9th, 2007
Time: 4:30 PM