N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Du Gia, E slopes of Phu Tha Ca mountain system at 1400 m elev. (N 23°56′ E 105°13′). Primary evergreen broadleaved very wet mountain forest on shale very steep slopes. Terrestrial and lithophyte herb up to 2 m hg on steep rocky slope. Flowers white, central tepal with deep purple longitudinal stripes. Not common.
CBL 2031 03 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)