S. Vietnam, Prov. Lam Dong, distr. Lac Duong, municipalite Da Chay, 40 km to NE from Dalat city. Closed primary very wet broadleaved forest along stream canyon on SW macroslope of Hon Giao mt. ridge at 1600-1700 m alt. (N 12° 11′, E 108° 43′). Terrestrial and epilitic herb up to 0.6 m hg on wet open rocky steep slopes along stream canyon. Flowers white, anthers yellow. Common, especially in wet shadow places at 1500-1650 m alt. VH 4399 26.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)