S. Vietnam, Prov. Ninh Thuan, distr. Ninh Son, municipalite Phuoc Binh in 34 km to NE from Dalat city. Closed primary wet broadleaved forest om E macroslope of Gia Rich mt. ridge at 1700-1800 m alt. (N 12° 07′, E 108° 42′). Terrestrial herb on shadow rocky slopes of deep stream canyon near water. Flowers white. Common. VH 3600 04.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)