Systematics Section / ASPT
Chuba, David , Fishbein, Mark , Goyder, David J. , Chase, Mark W. .
Phylogenetic systematics and biogeography of the African Asclepias (Apocynaceae) complex.
THIS study analyzes the molecular phylogenetic relationships and biogeographic patterns within the African Asclepias complex (Asclepiadinae, Apocynaceae) and its relationship with North American Asclepias sensu stricto. The African “Asclepias complex” has historically been subject to various delimitations resulting in very mobile generic concepts within the subtribe Asclepiadinae. Currently, species placements have only been made for some of the taxa (about 95 taxa are still under either Asclepias or Xysmalobium and have yet to be assigned to a number of different genera). The study employs molecular phylogenetic analysis based on trnS-G spacer, trnG intron, rpl16 intron, and trnC-rpoB spacer cpDNA sequences to estimate phylogenetic relationships, assess the monophyly of current generic delimitations, and assess generic affinities of some unplaced taxa within the complex. Biogeographic analyses using DIVA (Dispersal-Vicariance Analysis) provide insights into the biogeography of the African Asclepiadinae. The sister-group relationship of the African Asclepias complex and North American Asclepias is corroborated and the monophyly of these groups supported. The unplaced taxa do not form a single monophyletic group. Most of the currently recognized genera are monophyletic. Gomphocarpus is not monophyletic, Glossostelma and Pachycarpus are sister taxa, and Xysmalobium is only monophyletic in the narrow sense.[c.e.:srb]
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1 - Portland State University, Biology Department, Po Box 751, Portland, Oregon, 97207-0751, USA
2 - Royal Botanic Garden, Kew, Herbarium, Richmond, Surrey, TW9 3AB, United Kingdom
3 - Royal Botanic Gardens, Kew, Jodrell Laboratory, Richmond, Surrey, TW9 3AB, United Kingdom
African Asclepias complex
Presentation Type: Poster:Posters for Sections
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM