Abstract
Abstract To test the hypotheses that Oreomyrrhis species form the sister clade of North American Chaerophyllum and thus render the mainly Eurasian Chaerophyllum paraphyletic, two chloroplast intergenic spacers (atpB-rbcL and trnS-trnG) were analyzed. Phylogenetic estimates using maximum parsimony, maximum likelihood, and Bayesian inference of separate and combined matrices strongly support the monophyly of Oreomyrrhis and its sister-group relationship with North American Chaerophyllum. Chaerophyllum temulum, the type species of Chaerophyllum, is the sister taxon to the clade composed of Oreomyrrhis and North American Chaerophyllum. Relationships among other major clades of Chaerophyllum are congruent with previous studies. Based on these phylogenetic estimates, all currently recognized taxa of Oreomyrrhis are synonymised with Chaerophyllum. The unranked names, North American clade and Oreomyrrhis clade, are advocated to designate the two well-supported clades within Chaerophyllum sect. Chaerophyllum. The ...
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