S. Vietnam, Prov. Lam Dong, distr. Lac Duong, municipalite Da Chay, 35 km to NE from Dalat city. Closed primary broadleaved mt forest on W macroslope of Gia Rinh mt. ridge at 1600 m alt. (N 12° 09′, E 108° 41′). Terrestrial herb on shadow canyon slopes along stream. Flowers white, tepals at the base with purple nerves, lip with yellowish median keels. Not rare. VH 3747 07.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)