Figure 1 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 1 A Geographical distribution of 17 populations of the four species (Populusadenopoda, Populusdavidiana, Populusningshanica, Populuswulianensis) B The Principal Component Analysis (PCA) plot for the morphological variations of 17 populations of 4 species.