Japanese Supple-jack is an Asian vine with small pale flowers and dark, oval fruit. It is native to East and South Asia; in the southeastern U.S., a different native vine called supplejack can look similar.
The U.S. native supplejack has smaller flower clusters and typically more pairs of leaf veins. A close view of the leaves and flower clusters helps separate them.
Why they get mixed upBoth are woody vines with pale flowers, dark fruit, and overlapping English names.