N. Vietnam, prov. Cao Bang, distr. Nguyen Binh, municipality Ca Thanh, vicinities Ca Lu village, about 7-8 km to SE from Yen Lac village (N 22°44′ E 105°50′), about 38 km to NWW from Cao Bang town. Old wet broadleaved semideciduous primary forest on steep slopes of remnant limestone ridge at 1350 m alt. Shrublet up to 2-2.5 m hg in shadow canyon. Common.
CBL 559 21 Nov. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)