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 sphagnum swamp on high terrace of riwer 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. Small aquatic plant with erect inflorescence up to 15 cm lg in small swamp puddles. Flowers light violet. Rare, but occasionally abundant. VH 3734 06.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)