Fig. 5

BEAST2-derived chronograms of ITS haplotypes (a) and rps16 haplotypes (b) calibrated by the crown time of Akebia trifoliata. The age estimate (Ma) (HPD) for each node is shown beside the node. The regions with a greater than 95% posterior probability are indicated by thick branches. The red, yellow, green and blue branches represent haplotypes from the A (the eastern Tibetan Plateau), B (central Northern China), C (central China) and D (eastern China) regions, respectively, and the other black branches except those of the outgroup represent haplotypes from two to four different regions