Figure 1

(a) Colour-coded grouping of the 29 Lindera aggregata populations according to STRUCTURE with the most likely group number K = 5 (ArcGis 10.2, ESRI, www.esri.com), the dashed black line represents the boundary of subtropical (Sino-Japanese Floristic Region) and tropical (Paleotropic Floristic Region) regions. The shaded area indicates the species’ distribution range. (b) BEAST-derived phylogeny for the 29 populations. The colour of populations indicates their genetic cluster as inferred by STRUCTURE. Statistically significant posterior probabilities (PP > 0.95) are labeled in black dots.