Fig. 2.

Bayesian analysis of the ITS DNA sequence data set. Bayesian posterior support is indicated along the branches. Divergence time estimates (mya) have been redrawn from various phylogenetic analyses (Karl et al., 2012; Karl and Koch, 2013, 2014). New DNA sequences are highlighted in red (Supplementary Data Tables S1 and S2). All Arabis scabra accessions analysed carried identical DNA sequences. *Conflicting phylogenetic signal among Arabis stellulata. ^#Different phylogenetic position of Arabis serpyllifolia compared with plastid data.