Two major clusters of populations that correlated to
their geographical distribution were identified in the UPGMA
dendrogram (Figure 1). One cluster was composed of
populations from Yunnan region, while the other contained
populations from Hainan-Laos. In the Yunnan cluster,
populations B and D collected from the west of Yunnan
province were further clustered, while the others collected
from the southeast of Yunnan were grouped. In the Hainan-Laos
cluster, all the populations sampled from Hainan