Figure 1

Geographical distribution of the 34 sampled populations. The detailed information of sampled sites is in Table S1. The proportions of hexaploids and tetraploids are indicated by the sizes of black and gray pie charts respectively. Percentage of hexaploids and sample size in bracket are given nearby. The map was created in ARCMAPv.9.3 (ESRI, Redlands, CA, USA) (http://www.esri.com/products).