Ocampo, Gilberto , Columbus, J. Travis .
Systematics of Portulaca (Portulacaceae).
Portulaca is one of 19 genera in the non-monophyletic Portulacaceae, and comprises ca. 100 species distributed worldwide, with centers of diversity in South America and Africa. Included in the study were 40 samples representing ca. 30 selected taxa from around the world. We sequenced one nuclear (ITS) and three chloroplast markers (the coding ndhF, the psbD-trnT intergenic spacer, and the ndhA intron), and analyzed them using parsimony, maximum likelihood, and Bayesian methods for estimating the phylogeny. The genus was found to be monophyletic with high support. There are two major clades, one primarily with New World representatives (with alternate leaves), and the other with Old World taxa (with opposite leaves). Relationships, character evolution, the infrageneric classification, and biogeographical patterns are discussed.
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Gilberto Ocampo - Rancho Santa Ana Botanic Garden
1 - Rancho Santa Ana Botanic Garden, Botany, 1500 North College Avenue, Claremont, California, CA 91711, USA
2 - Rancho Santa Ana Botanic Garden, Botany, 1500 North College Avenue, Claremont, California, 91711, USA
Presentation Type: Oral Paper:Papers for BSA Sections
Location: Magpie A/Cliff Lodge - Level B
Date: Tuesday, July 28th, 2009
Time: 11:15 AM