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. Herb 1-1.5 m hg on open rocks along stream. Not rare.
CBL 2014 03 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)