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 closed evergreen forest on foothills of remnant limestone ridge at about 400 m alt. Herb up to 1 m hg in open rocks. Prostrate herb in open place. Common at 400-600 m alt. Dominante of herb forest stratum.
CBL 619 25 Nov. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)