@ARTICLE{TreeBASE2Ref18140, author = {P. Wilkin and Peter Schols and Mark W. Chase and Kongkanda Chayamarit and Carol A. Furness and Franck Rakotonasolo and Erik Smets and Chirdsak Thapyai}, title = {A Plastid Gene Phylogeny of the Yam Genus, Dioscorea: Roots, Fruits and Madagascar}, year = {2005}, keywords = {}, doi = {}, url = {}, pmid = {}, journal = {Systematic Botany}, volume = {30}, number = {4}, pages = {}, abstract = {In the pantropical genus Dioscorea the identification of monophyletic subgeneric taxa is a priority following recent phylogenetic studies of the families and genera of Dioscoreales. A phylogenetic analysis based on sequence data from the plastid genes rbcL and matK is presented, using 59 species of Dioscorea and covering all the main Old World and selected New World lineages. The analysis used 25 outgroup taxa, including Trichopus Gaertn., Tacca J.R. & G. Forster, Stenomeris Planch., and Burmanniaceae Blume. The main findings are; a) that a clade of rhizomatous taxa are sister to the rest of Dioscorea; b) the main Old World groups (such as the right-twining D. sect. Enantiophyllum) are monophyletic and represent the crown clades of Dioscorea; and c) there are two distinct lineages among the Malagasy endemic taxa. The impact of the results on the infrageneric classification of Dioscorea is considered, in particular the possibility of greatly simplifying the classifications of Knuth and Burkill. It is also used to present novel hypotheses of character evolution in key underground organ, inflorescence, fruit and seed characters and the origins of diversity in Dioscorea.} }

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