Cao Bang Prov., Bao Lac Distr., Hong An municipality, Mi Lung village.
Primary broad-leaved and mixed humid evergreen forest (with Podocarpus, Pinus, 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°49′15.4″N 105°49′53″E.
Herbaceous vine 2-4 m long in rather open place on rocky mossy mountain slope. Flowers dull yellowish. Not common.