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′). Epilite on shadow rocky stream canyon bluffs. ѯ white. Not rare. VH 4366 25.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)