Figure 2 from: Zhang L, Wang M, Ma T, Liu J (2018) Taxonomic status of Populus wulianensis and P. ningshanica (Salicaceae). PhytoKeys 108: 117-129. https://doi.org/10.3897/phytokeys.108.25600

Figure 2 Principal Coordinates Analysis (PCA) of the 17 populations of 4 species based on genetic distance using SSR data (A); the optimal K value was estimated using (B) the distribution of delta K (K=2) and Bayesian clustering plots for 17 populations of 4 species based on variation at 14 nSSR loci (C).