S. Vietnam, Prov. Lam Dong, distr. Lac Duong, municipalite Da Chay, 29 km to NEE from Dalat city. Open wet coastal sands among large granite rocks along mt river on W macroslope of Bi Dup mt system at 1450 m alt. (N 12° 08′, E 108° 39′). Prostrate herb with brightly blue flowers in open places near water. Common. VH 4105 20.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)