N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Du Gia, vicinities of Coc Pan village (N 23°56′ E 105°13′). Secondary wet closed evergreen broadleaved forest on limestone ridge foothills along river at 450 m elev. Terrestrial herb in wet open place. Flowers white with light violet tint. Common weed in the area.
CBL 1998 03 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)