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Box-plot representing interspecific kimura-2-parameter pairwise distances (x-axes) among different groups (y-axes). A2 includes species C. turtschaninovii, C. humosa, C. yanhusuo, and C. caudata. A4 includes species C. watanabei, C. ambigua, C. humilis, C. kiautschouensis, and C. linjiangensis, and A1 includes A4 + C. fumariifolia (See Figure 2).
