Zhou, Linlin , Su, Yvonne C. F. , Saunders, Richard .
Molecular phylogenetic support for a broader delimitation of Uvaria (Annonaceae), inclusive of Anomianthus, Cyathostemma, Ellipeia, Ellipeiopsis and Rauwenhoffia.
The genus Uvaria is one of the largest palaeotropical genera in magnoliid basal angiosperm family Annonaceae, with c. 190 species of climbers or scandent shrubs throughout wet tropical regions of Africa and Asia. Uvaria closely resembles several other smaller genera, including Anomianthus, Cyathostemma, Ellipeia, Ellipeiopsis and Rauwenhoffia which all have stellate hairs, valvate sepals, partially or fully imbricate petals in two subequal whorls, monodal inaperturate pollen, and generally many-seeded apocarpous fruits. A molecular phylogenetic analysis of this group was undertaken using maximum parsimony, maximum likelihood and Bayesian methods with 143 newly generated sequences based on four chloroplast DNA regions (matK, psbA-trnH spacer, rbcL and trnL-F). The resultant trees were moderately well resolved with significant statistical support for most nodes. Uvaria is shown unequivocally to be paraphyletic, with all representatives of the other five genera nested within it. The distinguishing vegetative, floral and fruiting characteristics of the related genera are re-evaluated, and interpreted as no more than specialized adaptations of the basic Uvaria structure. The phylogeny of the Uvaria group also shows a very clear correlation with geographical origin, with species from west tropical Africa, west central and east tropical Africa, and Asia and Australia in three separate clades. The generic names Anomianthus, Cyathostemma, Ellipeia, Ellipeiopsis and Rauwenhoffia are accordingly reduced to synonymy with Uvaria, necessitating new nomenclatural combinations and replacement names.
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1 - The University of Hong Kong, School of Biological Sciences, Division of Ecology & Biodiversity, Pokfulam Road, Hong Kong, China
Presentation Type: Oral Paper:Papers for BSA Sections
Location: Cottonwood C/Snowbird Center
Date: Wednesday, July 29th, 2009
Time: 8:45 AM