N. Vietnam, prov. Cao Bang, distr. Ha Lang, municipality Dong Loan, vicinities of Ban Lung and Lung Phuc (N 22°46′ E 106°44′), about 50 km to E from Cao Bang town. Secondary evergreen forest on alluvial walley among limestone rocks on foothills of remnant limestone ridges at 400 m alt. Terrestrial herb in wet open place at the base of limestone bluffs. Flowers yellow. Not common.
CBL 590 24 Nov. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)