Fig. 4
Divergence time estimates based on complete plastid genome sequences from Lyrata and Arenosa in Central Europe. a: Map showing plastome clades (defined for Lyrata) and Arenosa plastid types from phylogenetic reconstruction. Color codes correspond to plastome clades from Figs. 3, 4c. Dashed grey line indicates the separation of northern and southern plastome types. b: Detailed zoom of map shown in A with information on snowline and ice sheet extensions during the Last Glacial Maximum (20 kya), and refuge area for plant species indicated according to different vegetation zones [35]. Dashed grey line indicates the major biogeographical separation of northern and southern plastome types. The map was created under the Open Data licence Creative Commons 3.0 Österreich (CC BY 3.0 AT). c: Combined BEAST results from two independent MCMC runs of 1*108 generations each. Secondary calibration was performed using the results from Hohmann et al. (2015) [3] for the split of the outgroup genera, Capsella and Camelina, as well as for the Arabidopsis crown age and root height. Divergence time estimates are shown with their 95% HPD intervals, only node ages ≥0.05 mya are given. Taxa are indicated with color codes at sample names, tetraploids in bold. Four clades of Lyrata are indicated with yellow, orange and red bars (a, b, c, and d)