N. Vietnam, prov. Ha Giang, distr. Dong Van, municipality Ho Quang Phin, vicinities of Ta Xa village, 14-16 km to SSW of Dong Van town (N 23°16′ E 105°22′). Secondary open broadleaved wet forest with remnants of primary elements on steep slopes and bluffs of karst remnant limestone ridge at 1300-1400 m elev. Lithophyte herb on wet open rock outcrops. Flowers yellow. Common. Usual weed in the area.
CBL 1722 28 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)