Generic delimitations in tuberous Periplocoideae (Apocynaceae) from Africa and Madagascar
Ulrich Meve & Sigrid Liede
Abstract: ITS region of nrDNA and trnT-L and trnL-F spacers as well as the trnL intron of cpDNA) give support for a broad taxonomic concept for Raphionacme including Pentagonanthus. Together with Schlechterella, which is sister to Raphionacme, all Raphionacme-like taxa form a derived monophyletic group of somewhat diverse species. Sister to the Schlechterella / Raphionacme clade is a clade comprised of Stomatostemma and the not truly tuberous vine Mondia. In the nuclear and combined analyses, sister to these two clades combined is a clade formed by Petopentia natalensis and Periploca. In consequence, the recent inclusion of the monotypic South African Petopentia in the monotypic Malagasy endemic Ischnolepis is to be rejected. Ischnolepis and the other Malagasy Periplocoideae investigated (Camptocarpus, Pentopetia) form a basal grade in the combined analysis, and a Malagasy origin for Periplocoideae is to be discussed.
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accession number = 965, Matrix accession number = M1587)