N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Du Gia, E slopes of Phu Tha Ca mountain system at 1800-2000 m elev. (N 23°56′ E 105°13′). Primary evergreen broadleaved very wet mossy cloud forest on quartzite very steep slopes. Lithophyte shrub with pendant shoots up to 1 m lg on quartzite shady cliffs. Inflorescence white. Not common.
CBL 2138 03 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)