@ARTICLE{TreeBASE2Ref17646, author = {Sasa Stefanovic and Mihai Costea}, title = {Reticulate evolution in the parasitic genus Cuscuta (Convolvulaceae): over and over and over again}, year = {2007}, keywords = {}, doi = {}, url = {}, pmid = {}, journal = {Canadian Journal of Botany}, volume = {}, number = {}, pages = {}, abstract = {The frequency and relative importance of hybridization in plants has been an area of intense debate. Although this evolutionary mechanism has received considerable attention from plant biologists, there are no well-supported cases of reticulate evolution involving parasitic plants to date. Recent molecular phylogenetic analyses revealed that the subgenus Grammica, the largest and most diverse group of the stem parasitic genus Cuscuta (dodders), consists of 15 major clades. We describe here five cases of strongly supported discordance between phylogenies derived from plastid and nuclear data and interpret them as results of five independent hybridization events. Three of these cases could represent relatively recent reticulations because each of them involves more closely related species, always confined within the same major clade as their putative parental species, and are sympatric/parapartric in distribution with them. The two remaining cases involve species whose potential progenitors are derived from different major groups of Grammica and are allopatric in their present distribution. A series of statistical tests was conducted to assess and further explore the significance of these phylogenetic incongruences. Alternative explanations for discordant gene topologies are explored. Cuscuta liliputana, a new Mexican species of hybrid origin is described.} }

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