Hoa Binh Prov., Lac Son Distr., Ngoc Son Municipality, Khu Village, Chan Lan Mt., around point 20°27′15”N 105°19′37”E.
In open places of heavily logged closed primary and secondary evergreen broad-leaved forest and woodland on shale soils at elevation about 600-700 m a.s.l.
Small woody vine, up to 3-5 m long. Petals greenish. Rare.