@ARTICLE{TreeBASE2Ref15000, author = {K. F. Chung and C. I. Peng and Stephen R. Downie and Krzysztof Spalik and Barbara A. Schaal}, title = {Molecular systematics of the trans-Pacific alpine genus Oreomyrrhis (Apiaceae)- phylogenetic affinities and biogeography implications}, year = {2005}, keywords = {}, doi = {}, url = {}, pmid = {}, journal = {American Journal of Botany}, volume = {}, number = {}, pages = {}, abstract = {Alpine ecosystem is the only terrestrial biogeographic unit that is distributed globally. Studying phylogenetics of the plant species in this widespread ecosystem will provide insights into the historical biogeographic processes that have shaped the global biodiversity. The trans-Pacific disjunct alpine genus Oreomyrrhis (Apiaceae) was investigated using nuclear rDNA ITS sequences to test the taxonomic and biogeographic hypotheses. Phylogenetic analyses using maximum parsimony, maximum likelihood, and Bayesian inference revealed that species of Oreomyrrhis form a weakly supported monophyletic clade that is nested within Chaerophyllum sect. Chaerophyllum (subtribe Scandicinae, tribe Scandiceae). The optimal solutions of dispersal-vicariance analysis indicate that the ancestor of Chaerophyllum sect. Chaerophyllum (including Oreomyrrhis) was distributed in Eurasia and subsequently dispersed to North America and southern Pacific Rim. Dating using ITS sequence variation suggests that these dispersal events were recent, probably during late Tertiary to Quaternary. The structure of the ITS haplotype network suggests that a rapid range expansion via long-distance dispersal had been crucial in generating the trans-Pacific disjunction of Oreomyrrhis. Furthermore, evolution toward smaller mericarp size, reduction in chromosome number, and a transition from outcrossing to selfing during Oreomyrrhis?s evolution might have increased the chances to long-distance dispersal, facilitating its range expansion and occupation on alpine environments.} }

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