Figure 2. Reduced-median network for chloroplast DNA haplogroups.

In total, 21 biallelic sites were used to define the haplogroups (Table S2). Circles denote haplogroups (with diameters proportional to the number of accessions). Mutations that define haplogroups are shown on the branches. mv denotes a hypothetical haplogroup not found in this study. Grey scale indicates geographic origin proportions: grey for western habitats (longitude <60°E) and black for eastern habitats (longitude ≥60°E).