N. Vietnam, prov. Cao Bang, distr. Ha Lang, municipality Dong Loan, vicinities of Ban Lung and Lung Phuc (N 22ш46' E 106ш44'), 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. Terrestrial herb up to 1.5 m hg on open bluffs. Flowers yellowish. Not rare.
No CBL 641 25 Nov. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)
Collectors: Averyanov L., P.K.Loc, N.X.Tam.
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