Vietnam, Ha Giang Prov., Meo Vac Distr, Sung Tra Municipality, vicinities of Ta Cha Lang village around point 23°10′12″N, 105°17′39″E at elevation about 1100-1150 m a.s.l.
Highly degraded remnants of coniferous forest with Tsuga chinensis on very steep rocky slopes and along tops of rocky remnant ridges composed with highly eroded marble-like limestone.
Creeping lithophytic and epiphytic vine on shady steep slope. Rare.