Annals of Botany 107: 1259–1277, 2011 doi:10.1093/aob/mcr076, available online at www.aob.oxfordjournals.org Phylogeny, evolutionary trends and classification of the Spathelia–Ptaeroxylon clade: morphological and molecular insights M. S. Appelhans1,2,*, E. Smets1,2,3, S. G. Razafimandimbison4, T. Haevermans5, E. J. van Marle1, A. Couloux6, H. Rabarison7, M. Randrianarivelojosia8,9 and P. J. A. Keßler1,2 1Netherlands Centre for Biodiversity Naturalis (section NHN), Leiden University, PO Box 9514, 2300 RA Leiden, The Netherlands, 2Hortus botanicus Leiden, PO Box 9516, 2300 RA Leiden, The Netherlands, 3Laboratory of Plant Systematics, Institute of Botany and Microbiology, KU Leuven, Kasteelpark Arenberg 31, BE-3001 Leuven, Belgium, 4Department of Botany, Bergius Foundation, Stockholm University, SE-10691, Stockholm, Sweden, 5Muse´um National d’Histoire Naturelle, De´partement Syste´matique et Evolution, UMR 7205 CNRS/MNHN Origine, Structure et Evolution de la Biodiversite´, CP 39, 57 6 rue Cuvier, 75231 Paris cedex 05, France, Genoscope, Centre National de Sequenc¸age, 2, rue Gaston Cre´mieux, CP 5706, Downloaded from 91057 Evry cedex, France, 7De´partement de Biologie et Ecologie Ve´ge´tales, Universite´ d’Antananarivo, Madagascar, 8Unite´ de Recherche sur le Paludisme, Institut Pasteur de Madagascar, BP 1274, Antananarivo 101, Madagascar and 9School of Chemistry, University of KwaZulu-Natal, Durban 4041, South Africa * For correspondence. E-mail
[email protected] Received: 2 August 2010 Returned for revision: 15 November 2010 Accepted: 15 February 2011 http://aob.oxfordjournals.org/ † Background and Aims The Spathelia–Ptaeroxylon clade is a group of morphologically diverse plants that have been classified together as a result of molecular phylogenetic studies.