N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Du Gia, E slopes of Phu Tha Ca mountain system at 1600-1700 m elev. (N 23°56′ E 105°13′). Primary evergreen broadleaved very wet mountain forest on shale very steep slopes. Lithophyte herb on open wet vertical shale-quartzite cliffs along waterfall. Flowers light violet. Not common.
CBL 2070 03 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)