Figure 4: STRUCTURE analysis results. In each case, the appropriate value of K was determined from ΔK . Population numbers, corresponding to those in Figure 1, are shown along the top of each panel. Populations in which red-flowered individuals were sampled are indicated by asterisks along the bottom of each panel. (a) Cluster analysis results for SNPs in all populations (K = 2, 3). The relative relationship between average spur length relative and average visitor size (only bumblebees) in each population is shown by the relative sizes of the purple and yellow circles. Cluster analysis results for SNPs of only the (b) Utsukushigahara (K = 3), (c) Norikura+Ontake (K = 3), and (d) Iizuna (K = 2) regions.