Despite being a speciose component of the Cape Floristic Region at the southern tip of Africa, the southern African Oxalis lineage is systematically poorly understood. Palynological and preliminary phylogenetic studies of the group contrast with the current taxonomy, and indicate
the need for further research. Here we present a large-scale phylogenetic analysis comprising 150 of ± 210 southern African species, sampled for plastid trnL-F and trnS-G and nuclear ITS markers, using three different inference methods. Secondly, we explore the origins
of southern African Oxalis as a potential Cape clade. Despite substantial localised incongruence between plastid and nuclear datasets, analyses agreed on a monophyletic southern African clade, which consists of two species-poor and one extremely species-rich lineages. The current taxonomy
is shown to be artificial, with not one section retrieved as monophyletic. Our topologies are consistent with previous palynological and phylogenetic studies, and provide a backbone for future systematic work. Reconstructions of ancestral area for the southern African lineage support an origin
within or close to the Cape Floristic Region.
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CAPE FLORISTIC REGION;
GREATER CAPE FLORISTIC REGION;
SOUTHERN AFRICAN OXALIS
Document Type: Research Article
Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa;, Email: [email protected]
Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa
Department of Biochemistry, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa
Publication date: 2011-12-01
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