S. Vietnam, Prov. Lam Dong, distr. Lac Duong, municipalite Da Chay, vicinities Klong Lanh village, 32 km to NNE from Dalat city (N 12° 08′, E 108° 39′). River valley on NW macroslope of Bi Dup mt system at 1450 m alt. Prostrate small herb on wet open sandy places along river. Flowers blue. Very common. VH 3814 09.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)