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Analysis of the cosmopolitan buckthorn genera Frangula and Rhamnus s.l. supports the description of a new genus, Ventia

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The taxonomy of the species-rich and widespread Rhamnus s.l. is partially unresolved. While Frangula is morphologically similar to Rhamnus but separate according to previous molecular studies, the delimitation of sections within Rhamnus s.str., including the large Rhamnus sect. Rhamnus, remains unclear. In order to clarify the taxonomy of Rhamnus, we present the largest molecular dataset available to date, including ITS and trnL-trnF sequences of 103 species. fasttree-like searches, maximum likelihood estimates and Bayesian analyses were performed and compared. Our results are congruent across all analyses and show that the current subdivision of Rhamnus s.l. should be extended from two (Frangula, Rhamnus) to four distinct genera. First, we exclude six species from Rhamnus and attribute them to the new genus Ventia. Second, we raise the entire Rhamnus sect. Oreoherzogia to generic level. Finally, we confirm the monophyly of Rhamnus sect. Alaternus and R. sect. Rhamnus within Rhamnus s.str.
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Keywords: FRANGULA; INTERNAL TRANSCRIBED SPACER; MOLECULAR PHYLOGENETICS; OREOHERZOGIA; RHAMNACEAE; RHAMNUS, TRNL-TRNF; VENTIA

Document Type: Research Article

Affiliations: 1: Leipzig University, Department of Molecular Evolution and Plant Systematics & Herbarium (LZ), Johannisallee 21?23, 04103 Leipzig, Germany 2: Universidad Nacional Autónoma de Mexico, Departamento de Botánica, Apartado Postal 70-367, 04510 Mexico City, Mexico 3: Leipzig University, Department of Molecular Evolution and Plant Systematics & Herbarium (LZ), Johannisallee 21?23, 04103 Leipzig, Germany, German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, 04103 Leipzig, Germany;, Email: [email protected]

Publication date: 08 March 2016

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