FIGURE 4 Estimated population structure based on cpDNA ofCymbidium faberi in the Qinling Mountains. STRUCTURE bar plots for K = 2 to 4. K = 2: group1 (SXX, SZA), group2 (NCZ, NNZ, NXC, NXX, LLC, LSX, LXW, SDF, SFS, LXG, LGY, LSZ, SYX); K = 3: group1 (SXX), group2 (SZA), group3 (NCZ, NNZ, NXC, NXX, LLC, LSX, LXW, SDF, SFS, LXG, LGY, LSZ, SYX); K = 4: group1 (SXX), group2 (SZA), group3 (LSZ), group4 (NCZ, NNZ, NXC, NXX, LLC, LSX, LXW, SDF, SFS, LXG, LGY, SYX); Black vertical lines identify the population boundary. Estimated K values are represented in different colors