S. Vietnam, Prov. Kon Tum, Distr. Dak Gley, about 4-6 km to the S of Dak Gley town (near Dak Tung village). Herb up to 1 m high in wet open places, sometimes just in the water. Not rare.
VH 2377 06.12.1995
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