Sichuan: Jinchuan Xian.
S of the city of Jinchuan on highway S211 to Dusong Xiang, then W along Sesiman Gou toward border with Maerbang Xiang.
Remnant forest on steep slopes (often with loose rocks) and immediately along river. Dominant trees: Koelreuteria, Pittosporum, Carpinus, Ostrya, Acer davidii, Salix, Abies
Climbing over various plants.To 7 m tall; petals white; stamens white.
D. E. Boufford, K. Fujikawa, S. L. Kelley, R. H. Ree, B. Xu, D. C. Zhang, J. W. Zhang, T. C. Zhang, W. D. Zhu