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 herb with leaves up to 1.5 m lg on steep slopes of shadow deep stream canyon. Flowers yellow. Common. VH 4383 26.04.1997
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)