(A) Phylogenetic network of the four species and outgroup of Ainsliaea reconstructed with the NeighborNet method. The network is based on the combined sequences of 10 nuclear gene loci (total length 4502 bp) from 72 individuals, including two outgroup individuals. Each individual is numbered according to its locality. (B) Assignments of individuals to clusters (K = 2–5) for the four species inferred by STRUCTURE. The clustering pattern was highly consistent across 20 independent runs for each cluster, and one of the results is shown.