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. 1000 m (SSW macroslope of Hoang Lien Son ridge). Woody vine up to 10 m lg with milky juice in open place. Flowers light orange Not common.
NTH 2705 21-22 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)