Border area between Phieng Luong municipality (Ha Giang Prov., Bac Me Distr.) and Sinh Long municipalitiy (Tuen Quang Prov., Na Hang Distr.). Primary broad-leaved humid evergreen and mixed forest on very steep slopes and along rocky ridge composed with solid crystalline highly eroded limestone at elevation 1100-1170 m a.s.l. around point 22°38′24.3″N 105°20′21.3″E. Creeping epiphyte and lithophyte vine 2-3.5 m long on rocky slope. Occasional. 14 November 2014 CPC 7431a/TM 1138 Living plant only. Coll.: L.Averyanov, N.T.Hiep, N.S.Khang, T.Maisak, L.Osinovetz Flowered in cult. in October – November 2015. Flowers with strong, unpleasant smell. Photos. Herb. Collected from living plant, L.Averyanov CPC 7431a/TM 1138/14372.