S. Vietnam, Prov. Kon Tum, Distr. Dak Gley, about 15-18 km to NW of Dak Gley town, between Mang Khen (Dak Che) and Dak Polo villages, near Laos boundary. Primary evergreen mountain forest at 1250-1450 m alt.
Herb up to 1.5 m high with milky juice, in open wet places. Flowers violet. Rare.
VH 1917 22.11.1995
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