Peter W. MoonlightWisnu H. ArdiLuzmila Arroyo PadillaKuo Fang ChungDaniel FullerDeden GirmansyahRuth HollandsAdolfo Jara-MuñozRuth KiewWai Chao LeongYan LiuAdi MahardikaLakmini D.K. MarasingheMeriel O’ConnorChing I. PengÁlvaro J. PérezThamarat PhutthaiMartin PullanSangeeta RajbhandaryCarlos ReynelRosario R. RubiteJulia SangDavid ScherberichYu Min ShuiMark C. TebbittDaniel C. ThomasHannah P. WilsonNura H. ZainiMark HughesSingapore Botanic GardensFaculty of Environment and Resource Studies, Mahidol UniversityGuangxi Institute of Botany, Chinese Academy of SciencesAcademia Sinica, Biodiversity Research CenterPontificia Universidad Catolica del EcuadorTribhuvan UniversityUniversity of the Philippines ManilaUniversidad Nacional Agraria La MolinaOpen University of Sri LankaLembaga Ilmu Pengetahuan IndonesiaRoyal Botanic Garden EdinburghForest Research Institute MalaysiaLeiden UniversityKunming Institute of Botany Chinese Academy of SciencesThe University of Hong KongUniversity of PennsylvaniaUniversity of Wisconsin-SuperiorNational Taiwan UniversityUniversity of GlasgowJardín Botánico de Bogotá José Celestino MutisCenter for Plant Conservation of Bogor Botanical GardensJardin Botanique de LyonBotanical Research CentreUniversidad Autónoma Gabriel René Moreno2019-08-232019-08-232018-05-01Taxon. Vol.67, No.2 (2018), 267-32319968175004002622-s2.0-85046720609https://repository.li.mahidol.ac.th/handle/123456789/44771© International Association for Plant Taxonomy (IAPT) 2018, all rights reserved The pantropical genus Begonia is the sixth-largest genus of flowering plants, including 1870 species. The sections of Begonia are used frequently as analogues to genera in other families but, despite their taxonomic utility, few of the current sections have been examined in the light of molecular phylogenetic analyses. We present herein the largest, most representative phylogeny of Begonia published to date and a subsequent provisional sectional classification of the genus. We utilised three plastid markers for 574 species and 809 accessions of Begonia and used Hillebrandia as an outgroup to produce a dated phylogeny. The relationships between some species and sections are poorly resolved, but many sections and deeper nodes receive strong support. We recognise 70 sections of Begonia including 5 new sections: Astrothrix, Ephemera, Jackia, Kollmannia, and Stellandrae; 4 sections are reinstated from synonymy: Australes, Exalabegonia, Latistigma and Pereira; and 5 sections are newly synonymised. The new sectional classification is discussed with reference to identifying characters and previous classifications.Mahidol UniversityAgricultural and Biological SciencesArticleSCOPUS10.12705/672.3