S. Vietnam, Prov. Khanh Hoa, distr. Khanh Son, 42 km to NE from Dalat city. Primary closed broadleaved evergreen forest on shelfes and along bluffs of giant waterfall in upper reaches of Lieng Ly river on E macroslope of Hon Giao mt. ridge at 1300 m alt. (N 12° 12′, E 108° 44′). Epiphyte. Flowers yellowish-white, lip with purple-violet marks. Common. VH 4377 25.04.1997 International Botanical Expedition of the U.S.A. National Geographic