@ARTICLE{TreeBASE2Ref18745, author = {Bart Jacobs and Koen Geuten and Nancy Pyck and Suzy Huysmans and Steven Jansen and Erik Smets}, title = {Unravelling the phylogeny of Heptacodium and Zabelia: An interdisciplinary approach.}, year = {2010}, keywords = {}, doi = {}, url = {}, pmid = {}, journal = {Systematic Botany}, volume = {}, number = {}, pages = {}, abstract = {Recent molecular investigations place Heptacodium as sister to the Lonicera clade, whereas morphology suggests a close relationship with the Lonicera clade. Zabelia has always been assumed to be closely related or even congeneric with Abelia. This study presents molecular and morphological data in an attempt to further clarify the systematic positions of Heptacodium and Zabelia. Our molecular data strongly supports a sister relationship between Heptacodium and the Lonicera clade. Zabelia, however, seems to be closer related to the Morina clade than to any other member of the Linnaea clade. None of our phylogenetic analyses linked Abelia to Zabelia. Zabelia?s relationship with the Morina clade is not supported by morphology apart from the presence of psilate pollen grains with an endocingulum encountered in both clades. Fruit and seed morphology strongly link Abelia, Heptacodium, and Zabelia together. Even though wood anatomy of Zabelia is unique in several aspects, it cannot be used to infer the systematic position of the genus. In the case of Heptacodium, hybridization is a plausible scenario that could explain the uncertain systematic position of the genus. A better understanding of the intergeneric relationships of the Lonicera and Linnaea clades is vital to solve this matter.} }

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