S. Vietnam, Prov. Lam Dong, distr. Lac Duong, municipalite Da Chay, vicinities Klong Lanh village, 31 km to NE from Dalat city. Secondary open swamp along stream in river valley on W macroslope of Bi Dup mt system at 1450 m alt. (N 12° 08′, E 108° 39′). Very common, often dominant in short tall grass grasslands, especially in wet places. VH 3466 31.03.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)