S. Vietnam, Prov. Lam Dong, distr. Lac Duong, municipalite Da Chay and Prov. Khanh Hoa, distr. Khanh Son boundary region, 41 km to NE from Dalat city. Primary closed broadleaved cloud forest along Nui Hon Giao ridge at 1700 m alt. (N 12° 11′, E 108° 43′). Epilitic prostrate herb on stream rocks. Common at 1700-1900 m alt on S and SW ridge macroslope. VH 4380 26.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)