We divided the 35 C. hainanense samples roughly into two general taxa, which can be further subdivided into several subgroups. Group I mainly comprise resources from Diaoluoshan (DLS) and Baishaling (BSL), while Wuzhishan (WZS), Huishan (HS), Bawangling (BWL), and Jianfengling (JFL) are clustered into group II (see Figure 2). The small subgroups clustered in group I were further divided into two smaller subgroups, indicating a relatively significant genetic relationship between each other in this larger group. The aggregation of samples in the second group is relatively chaotic, suggesting that there is less genetic relationship among the individuals in this population. From this perspective, although there is some geographical isolation between C. hainanense resources from different areas, there is a direct and necessary relationship between clustering based on genetic distance and their geographical origin.
Figure 2 The neighbor-joining cluster of C. hainanense in different population