Vientiane Prov., Vang Vieng Distr., Na Khun Village, around point 18°52′28”N 102°24′21”E.
Dry open shrubs and remnants of dry open broadleaved forest on very steep slopes and cliffs of high remnant hill composed with solid marble-like highly eroded rocky limestone at elevation 400-600 m a.s.l.
Woody vine 10-15 m long on rocky top of ridge. Flowers green. Occasional.