Summary of chloroplast haplotypes detected in B. gymnorrhiza, B. sexangula, and B. × rhynchopetala (indicated in bold).

The number of individuals included from each site and locality label can be found in Table 1.GenBank accession numbers are provided in Table S1.Statistical parsimony network of these haplotypes is shown in Figure 2.aBS1090JR is likely a hybrid, which has the same haplotype E as some of the individuals of B. sexangula, but is grouped with B. gymnorrhiza and B. × rhynchopetala based on nuclear markers (see Figure 3); bBG420ER is also likely a hybrid which has the same haplotype E as some of the individuals of B. sexangula, but is grouped with individuals of B. gymnorrhiza and B. × rhynchopetala from the same site based on nuclear markers.