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 evergreen broadleaved closed forest on steep slopes and cliffs of limestone ridge at 500-600 m alt. Common grass on open places. Codominante of herb stratum on open steep wet slopes at 400-500 m alt.
CBL 622 25 Nov. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)