Fig. 3

The source and distribution of population materials of P. rockii. A collection of more than 200, 000 cultivated germplasm resources of P. rockii is mainly obtained from Lanzhou, Baiyin, Linxia and Dingxi city, Gansu province in Northwest China and cultivated in open fields, using standard agronomic practices, in Beijing Guose Peony Garden of Yanqing District at Beijing, China. Figure 3 was created in ArcGIS 10.0 http://www.esrichina.com.cn