This volunteer popped up suddenly, and I haven't a clue what it is. This photo is a cutting of it I stuck in a bud vase with some scilla siberica. It is actually a plant about a meter high with 3 columnar branches (a vine? a shrub?). Its leaves are maple-like in shape, but fringed, and its flowers are a pinkish-red, five petals. I don't know if its wild or cultured. I have tried a few plant databases online, but I'm coming up empty. Anyone have an idea what it might be?