N. Vietnam, Ha Giang prov., Meo Vac distr., vicinities of Meo Vac town (N 23°10′ E 105°24′), 48.2 km to 36° of Ha Giang city. Primary evergreen broadleaved wet closed forest on sandstones at elev. 1200-1400 m a.s.l. Forb vine 6-8 m lg in open places. Flowers white. Not rare.
NTH 3381 07 Oct. 1999
Collectors: N.T. Hiep, N.Q. Binh, L. Averyanov, P. Cribb.