S. Vietnam, Prov. Lam Dong, distr. Lac Duong, municipalite Da Chay, 40 km to NE from Dalat city. Closed secondary evergreen broadleaved forest rich in primary elements along river on SW macroslope of Nui Hon Giao ridge at 1500-1550 m alt. (N 12° 11′, E 108° 43′). Herb up to 1.5 m hg in open place. Flowers blue-violet. Common. VH 4558 05.05.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)
Collectors: L. Averyanov, N.Q. Binh, N.T. Hiep, P.K. Loc, P. Lowry