N. Vietnam, prov. Son La, distr. Moc Chau, municipality Chieng Hac, vicinities of Co Liu village (N 20°51′ E 104°38′). Forb up to 0.6 m hg among open wet rocks along Xap river at about 500 m elev. Flowers pinkish. Very common.
NTH 2906 28 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)