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′). Terrestrial and epilitic herb up to 1 m hg on steep wet rocky river slopes. Flowers white. Common. VH 4316 24.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)