Paeonia rockii

Rock's peony or tree peony (Paeonia rockii, synonym Paeonia suffruticosa subsp. rockii) is a woody species of peony that was named after Joseph Rock. It is one of several species given the vernacular name tree peony, and is native to the mountains of Gansu and adjoining provinces in China. In Chinese, it is known as 紫斑牡丹 (pinyin:zǐbān mǔdān).