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 steep slope of remnant karst limestone ridge at elev. about 1650 m. Lithophyte forb up to 20 cm hg on shady vertical cliffs. Flowers white. Common.
NTH 2782 25 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)