@ARTICLE{TreeBASE2Ref18012, author = {Steven J. Wagstaff and Ilse Breitwieser and Ulf Swenson}, title = {Origin and relationships of the austral genus Abrotanella (Asteraceae) inferred from DNA sequences}, year = {2005}, keywords = {}, doi = {}, url = {}, pmid = {}, journal = {TAXON}, volume = {}, number = {}, pages = {}, abstract = {Relationships of the small austral genus Abrotanella are uncertain. It was previously included in the Anthemideae or more recently in the Senecioneae. We conducted a phylogenetic analysis of 39 accessions including most species of Abrotanella and putatative relatives including Blennosperma, Crocidium and Ischnea. These four genera have been considered to form subtribe Blennospermatinae. Our results suggest that the Blennospermatinae are polyphyletic; Blennosperma, Crocidium and Ischnea form a well-supported clade nested within the Senecioneae, while Abrotanella forms another well-supported clade that is distinct from these genera, and its sister is not resolved. Molecular dating of Abrotanella suggests that the lineage initially diverged during the early Miocene. Secondary species radiations in Australasia and in southern South America that occurred 3 million years ago undoubtedly reflect long-distance dispersal, colonization, and speciation. The divergence estimates are robust to the genes that were sequenced, to changes in the tree topology, and to the method used to estimate divergence times.} }

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