S. Vietnam, Prov. Lam Dong, distr. Lac Duong, municipalite Da Chay and Prov. Khanh Hoa, distr. Khanh Son boundary region, 41 km to NE from Dalat city. Primary closed broadleaved cloud forest on tops of Nui Hon Giao ridge at 1950-2050 m alt. (N 12° 11′, E 108° 43′). Prostrate terrestrial and epilitic herb in open places. Flowers brightly blue. Not common. VH 4237 23.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)