N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Du Gia, E slopes of Phu Tha Ca mountain system at 1500-1600 m elev. (N 23°56′ E 105°13′). Primary evergreen broadleaved very wet mountain forest on shale very steep slopes. Woody vine or climbing shrub 2-3 m hg in open place. Flowers light yellowish. Not common.
CBL 2036 03 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)