N. Vietnam, prov. Cao Bang, distr. Bao Lac, municipality Yen Lac, vicinities of Yen Lac village (N 22°44′ E 105°50′). Secondary wet broadleaved evergreen forest in deep shady limestone ridge canyon along stream at about 1000 m elev. Terrestrial and lithophyte herb on open rocks. Flowers yellow. Very common. Usual weed all over the area.
CBL 1450 16 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)