Li Jiajue 2005, Chinese Tree Peony, Xibei, Xinan, Jiangnan Volume
'Hei Yuanshuai' Anemone or single form, blackish purple. Selected, Cultivated and named by Chen D.Z.. [detailed description available on page 105]
McLewin & Chen (2006) Peony rockii and Gansu Mudan
Hei Yuan Shuai breeder, date: Chen Dezhong between 1993 and 1994 engl. translation: Black Marshall color & form classification categories , remarks: 7.1.04, Early flowering not online: 216
Cheng Fangyun: 'Chinese Flare Mudan' (Beijing 2005)
'Hei Yuan Shuai' description (in chinese) & picture available on page 142.
