Vietnam, Thua Thien – Hue Prov., Huong Thuy Distr., Duong Hoa Municipality, Huong Thuy forest enterprise territory, around point 16°13'25''N, 107°34'09''E, rocky quartzite outcrops along Mang Chan ridge at elevation about 825 m a.s.l. Fractionally logged primary closed evergreen broad-leaved forest along ridge tops composed with white eroded quartzite. Epiphyte on mossy trees. Flowers white, with very pleasant fragrance, lip with 4 violet spots. Not common.