S. Vietnam, Prov. Lam Dong, distr. Lac Duong, municipalite Da Chay, 32.5 km to NE from Dalat city. Closed primary broadleaved mt forest along very wet deep stream canyon on NNW macroslope of Bi Dup mt system in 6-7 km to NNW from main peak at 1600-1700 m alt. (N 12° 07′, E 108° 41′). Shrub up to 4 m hg. Common on open wet stream rocks near waterfalls. Flowers brightly blue. VH 3391 30.03.1997 International Botanical Expedition of the U.S.A. National Geographic