N. Vietnam, prov. Lai Chau, distr. Sin Ho, municipality Ta Ngau about 30 km of Lai Chau town to the N (N 22°18′ E 103°15′). Secondary open wet mossy evergreen broadleaved forest with remnants of primary elements on rocky foothills of remnant karst limestone ridge at elev. about 1600 m. Terrestrial and lithophyte prostrate forb in open wet places. Flowers dull pale blue-violet. Very common.
NTH 2757 25 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)