S. Vietnam, Prov. Lam Dong, distr. Lac Duong, municipalite Da Chay, vicinities Klong Lanh village, 32 km to NNE from Dalat city (N 12° 08′, E 108° 39′). Open spring grassy-sedges swamp on high terrace of river valley at the base of hills with old open Pinus kesiya forest at 1450 m alt. in 6-7 km from Bi Dup main peak to the W. Aquatic plant erected below water of small swamp puddles up to 10 cm hg. Flowers light violet. Rare. VH 3969 14.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)