N. Vietnam, prov. Cao Bang, distr. Nguyen Binh, municipality Ca Thanh, vicinities of Ta Phinh village (N 22°44′ E 105°50′). Primary open semideciduous mixed mossy forest (with Pseudotsuga brevifolia, Tsuga chinensis and Pinus kwangtungensis) along tops of remnant karst limestone ridge at 1350-1400 m elev. Herb vine 3-4 m lg in open place. Not common.
CBL 1558 19 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)