Systematics Section / ASPT
Ocampo, Gilberto , Columbus, J. Travis .
Molecular phylogenetics of New World Portulaca (Portulacaceae).
Portulaca is one of 19 genera recognized in Portulacaceae and comprises about 100 species distributed worldwide mainly in tropical and subtropical zones, with centers of diversity in South America and Africa. The genus is of no major economic importance, except for P. oleracea L., a cosmopolitan weed used as salad, and P. grandiflora L. is widely cultivated as an ornamental. In this molecular phylogenetic study we sample more than 30 New World taxa and use chloroplast (ndhF, psbD–trnT), mitochondrial (nad1), and nuclear (ITS) sequences; phylogenetic estimates were obtained using maximum parsimony and Bayesian approaches. The genus was found to be monophyletic with high support, and includes four main clades, three of them with North and South American representatives. Implications for infrageneric taxonomy, character evolution, and biogeography are discussed.
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1 - Rancho Santa Ana Botanic Garden, Botany, 1500 North College Avenue, Claremont, California, CA 91711, USA
2 - Rancho Santa Ana Botanic Garden, 1500 North College Avenue, Claremont, California, 91711, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Boulevard C/Hilton
Date: Wednesday, July 11th, 2007
Time: 10:15 AM