Climbing hydrangea (Hydrangea barbara, formerly Decumaria barbara) is a fairly common native vine found in swamps, bottomlands and moist areas.  In a landscape setting, it could be used as a groundcover, or maintained on a trellis or fence for privacy.  Infinitely preferable to the invasive and destructive English ivy (Hedera helix).  Showy umbels of white flowers appear in May or June, but occur only on plant growth that is climbing.  Watch for this plant in our local woods this spring.