N.Vietnam, Bac Kan Prov., Na Ri Distr., Liem Thuy Municipality, Na Bo village, around point 21°56′44′'N, 106°05′09′'E, at elevation 300-600 m a.s.l.
Primary selectly logged broad-leaved evergreen forest on very steep slopes and cliffs of rocky ridge composed with white solid marble-like crystalline limestone.
Woody vine 10-15 m long. "Inflorescences" green. Not common.