S. Vietnam, Prov. Kon Tum, Distr. Dak Gley, about 10 km to N of Dak Gley town, between Dak Nen and Mang Khen (Dak Che) villages. Secondary evergreen mountain forest rich in primary elements at 800-900 m alt. Prostrate herb rooting at nodes. In wet open places along stream. Flowers blue. Very common, dominante in open wet places. VH 1846 19.11.1995
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5094-93) Participants: L. Averyanov, N.T. Ban, A. Budantzev, L. Budantzev, N.T. Hiep, D.D. Huyen, P.K. Loc, G. Yakovlev