S. Vietnam, Prov. Lam Dong, distr. Lac Duong, municipalite Da Chay, 40 km to NE from Dalat city. Closed primary evergreen broadleaved wet mt forest on SW macroslope of Hon Giao mt. ridge at 1500-1650 m alt. (N 12° 11′, E 108° 43′). Prostrate herb up to 0.6 m hg in open wet places along river. Flowers white. Common. VH 4427 26.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)