N. Vietnam, prov. Lao Cai, distr. Than Uyen, municipality Ho Mit (N 22°06′ E 103°52′). Remnants of primary broadleaved evergreen wet forest on quartzites along Mit Noi river between Ho Mit and Ban Thao villages at elev. 900 m (SSW macroslope of Hoang Lien Son ridge). Tree 6-10 m hg in open steep slopes. Flowers dirty purple. Very common in the area on elev. 800-1100 m.
NTH 2697 21-22 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)