N. Vietnam, Lang Son prov., Huu Lung distr., Huu Lien municipality (N 21°40′ E 106°22′). Primary dry evergreen broadleaved forest along tops of remnant karst limestone ridge at elev. 270 m a.s.l. Climbing shrub with shoots up to 2 m long in open place. Flowers orange. Common.
NTH 3270 02 Oct. 1999
Collectors: N.T. Hiep, N.Q. Binh, L. Averyanov, P. Cribb.