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. Open primary mixed mossy semideciduous and coniferous forest along tops of limestone ridge at 650-700 m alt. Herb up to 2 m hg on open steep slopes and bluffs. Flowers yellowish. Common.
CBL 646 25 Nov. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)