Three varieties, per Farjon (2005):
China: Gansu, Hubei, S Qinghai, Shaanxi, W Sichuan, NW Yunnan, Xizang (Tibet) (Farjon 2005).
I encountered var. wilsonii in 1988-89 on the western slopes of Gongga Shan (Sichuan) in the vicinity of Liu Ba, where it grows near and above the alpine timberline.
Farjon (2005) provides a detailed account, with illustrations.
Last Modified 2012-11-23