S. Vietnam, Prov. Lam Dong, distr. Lac Duong, municipalite Da Chay, 40 km to NE from Dalat city. Closed primary wet broadleaved cloud forest on SW macroslope of Hon Giao mt. ridge at 1700 m alt. (N 12° 11′, E 108° 43′). Terrestrial and epilite herb up to 10 cm hg. Flowers white, anthers brightly yellow. Abundant at 1500-1900 m alt, especially on W macroslope of ridge. VH 4127 21.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)