Fig. 4.

Plastid DNA haplotype diversity encountered in 129 populations of the Veronica chamaedrys group from southeastern Europe. (Left) Simplified majority rule consensus tree from relaxed clock Bayesian analysis with the software BEAST. Node heights correspond to median ages (see text for details); nodes with age estimates younger than 0.04 my are not shown and are thus not distinguishable from unresolved lineages. Numbers along branches are Bayesian posterior probabilities; identical haplotypes or unresolved polytomies are collapsed as triangles, their vertical extension being proportional to the number of individuals. The bar depicts the ploidy level of a lineage (light grey, diploid; dark grey, tetraploid). The insert at the bottom shows the Bayesian Skyline Plot (median and 95% high posterior density limits). (Right) Statistical parsimony network of plastid DNA haplotypes. Haplotypes that were not sampled are shown with small open circles. Outline shading corresponds to the three main AFLP groups presented in Fig. 3; individuals of the Krumovii Group are marked with an asterisk. Di- and tetraploids have thin and thick outlines, respectively. The four main lineages identified by Bayesian analysis (at the left) are indicated.