S. Vietnam, Prov. Khanh Hoa, distr. Khanh Son, 42 km to NE from Dalat city. Primary closed broadleaved evergreen forest on E macroslope of Hon Giao mt. ridge at 1600-1700 m alt. (N 12° 12′, E 108° 44′). Terrestrial and epilitic herb up to 1 m hg in shadow steep rocky slope. ѯ white. Not common. VH 4345 25.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)