N.Vietnam, Ha Tinh Prov., Huong Son Distr., Son Kim Municipality, Rao Bun stream around point 18°23′39′'N, 105°15′12′'E. Primary coniferous closed forest with Fokienia hodginsii and Dacrydium elatum along ridge rib and on slopes near the ridge tops at elevation 1100-1200 m a.s.l. (Kho Mu mt.).
Prostrate herb on sandy wet place along small streamlet. Flowers light pink-violet. Rare.