N. Vietnam, prov. Ha Giang, distr. Meo Vac, municipality Sung Chang, vicinities of Lu Lu Phin village (N 23°11′ E 105°18′). Primary mixed mossy semideciduous open forest (with domination of Pseudotsuga brevifolia and Tsuga chinensis) along tops of karst remnant limestone ridge at 1350-1400 m elev. Herb vine 6-10 m lg in open place. Not common.
CBL 1866 29 April 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)