McLewin & Chen (2006) Peony rockii and Gansu Mudan
He Ping Er Qiao breeder, date: Chen Dezhong between 1986 and 1992 engl. translation: Peace Twin Beauties color & form classification categories , remarks: 9.4.06 not online: 243, 244, 008
Li Jiajue 2005, Chinese Tree Peony, Xibei, Xinan, Jiangnan Volume
'Heping Erqiao' Crown form, flowers white stripes alternating with bluish purple stripes, versi- color. Selected, cultivated and named by Chen D.Z.. [detailed description available on page 134]
Cheng Fangyun: 'Chinese Flare Mudan' (Beijing 2005)
'He Ping Er Qiao' description (in chinese) & picture available on page 158. + 159.
