Genome sequencing has demonstrated that besides frequent small-scaleduplications,large-scale duplication events such as whole genome duplication(WGD)are found on many branches of the evolutionary tree oflife.Most flowering plants have been shown to be ancient polyploidy thathave undergone one or more whole genome duplications early intheir evolution.Genome duplication has been proposed as an accelerator of evolution.Recent studiessuggest that polyploidy species can have a higher adaptability andincreased tolerance to different environmental conditions.It is still not clear whether theRehmanniahas occurredWGD in evolutionary history.In this paper,the phylogenetic relationships and divergence times of 14 angiosperms were estimated by phylogenetic analysis.