Li Jiajue 2005, Chinese Tree Peony, Xibei, Xinan, Jiangnan Volume

'Hei Zhenzhu' Anemone 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 Zhen Zhu breeder, date: Chen Dezhong between 1993 and 1994 engl. translation: Black Pearl color & form classification categories , remarks: 7.3.02, Early flowering not online: 217, 218

Carsten Burkhardt's Web Project Paeonia - The Peony Database

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