Phreatia densiflora (Blume) Lindl. var vietnamensis Aver.
S. Vietnam, Prov. Khanh Hoa, distr. Khanh Son, 42 km to NE from Dalat city. Primary closed broadleaved evergreen forest 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 rocks. Flowers white. Very common. VH 4296 24.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)