Lai Chau Prov., Sin Ho Distr., Ta Ngao Municipality, Hai Ho village, around point 22°21′34″N 103°15′02″E.
Secondary forest and shrubs on foothills of remnant hills and mountains composed with stratified solid gray highly eroded limestone at elev. about 1500 m a.s.l.
Terrestrial herb in spring-water swamp on travertine along stream valley. Flowers white, sometimes with light purple-violet tint. Locally very common.
HAL 10020 19 Nov. 2006 Screening. Coll.: Nguyen Tien Hiep, L.Averyanov, Pham Van The.