N.Vietnam, Cao Bang Prov., Trung Khanh Distr., Ngoc Khe Municipality, Pac Nga village, around point 22є54'59''N, 106є31'44''E, at elevation 750-850 m a.s.l. Secondary broad-leaved evergreen shady closed forest on very steep rocky slopes of rocky ridges and mesae composed with light gray solid marble-like highly eroded crystalline limestone. Shrub 1-1.5 m tall. Fruits yellowish-green. Occasional.