Cao Bang Prov., Bao Lac Distr., Huy Giap municipality, Lung Peng village.
Primary broad-leaved and mixed humid evergreen forest (with Podocarpus, Amentotaxus, Fokienia and Tsuga) on very steep slopes and along rocky ridge composed with solid crystalline highly eroded limestone at elevation about 1500-1550 m a.s.l. around point 22°48′10.2″N 105°49′24.8″E.
Woody vine about 4 m long in rather open place on rocky slope near mountain top. Flowers greenish. Common.