Northern Vietnam, Ha Tinh Prov., Huong Son Distr., Son Kim Municipality, in the vicinity of Rao An village, around point 18°24′30′'N, 105°13′13′'E. Remnants of primary evergreen lowland seasonal broad-leaved forest on very steep granite/shale slopes of rocky river canyon at 180-200 m a.s.l. Shrub 2-4 m hg in open wet place. Flowers bright blue. Common.