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Faculty for Biology, Chemistry, and Earth Sciences

Department of Plant Systematics: Angiosperm Working Group - Prof. Dr. Sigrid Liede-Schumann

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Thiv, M; Meve, U: A phylogenetic study of Echidnopsis Hook. f. (Apocynaceae-Asclepiadoideae): taxonomic implications and the colonization of the Socotran archipelago, Plant Systematics and Evolution, 265, 71-86 (2007)
We investigated the phylogeny, taxonomy and biogeography of the Eritreo-Arabian genus Echidnopsis Hook. f. (Apocynaceae-Asclepiadoideae). Phylogenetic reconstructions based on nrITS sequence data were obtained using maximum likelihood and parsimony analyses. The results reveal two weakly supported clades, each with a mix of African and Arabian taxa, including the genus Rhytidocaulon, and with four Socotran species forming a subclade of their own. Rather than a vicariance origin of these island elements, our data suggest a single dispersal event from eastern Africa. Echidnopsis thus parallels biogeographic patterns found for other Socotran endemic plants. Our revised taxonomy recognizes 28 species and 4 subspecies in the genus. Two new combinations, E. planiflora subsp. chrysantha and E. sharpei subsp. bavazzani are proposed.
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