A phylogenetic analysis of the Chamelaucium alliance (Myrtaceae)

Abstract

Analysis of sequence data from the matK gene and the atpβ–rbcL intergenic spacer for 70 representatives of the Chamelaucium alliance sensu Briggs and Johnson (1979) provides strong support for the monophyly of the alliance, but there is no support for their concept of suballiances on the basis of fruit type: indehiscent fruit have arisen in multiple lineages. There is, however, strong support for Calytrix, Homalocalyx and Ochrosperma being the first lineages to diverge within the alliance. A number of genera within the alliance are not monophyletic in this analysis, namely Astartea, Babingtonia, Baeckea sensu lato, Darwinia and Hypocalymma. Monophyly of Baeckea sensu stricto, Euryomyrtus, Ochrosperma, Rinzia, Scholtzia and Triplarina is strongly supported. Several well-supported groups that may warrant generic status have been identified.