N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Du Gia, E slopes of Phu Tha Ca mountain system at 1900-2000 m elev. (N 23°56′ E 105°13′). Primary evergreen broadleaved very wet mossy cloud forest on quartzite very steep slopes. Terrestrial and lithophyte herb on shady quartzite cliff. Leaves above deep green with whitish central part, below dirty violet. Flowers light blue with lilac. Common.
CBL 2089 03 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)