I received this climbing vine about 5 months ago from someone who also did not know what it was. It started as a tiny thing, and has grown quite rapidly (using twining tendrils) up this metal wall sculpture that you can partially see in the picture. It has easily reached the top of the sculpture, close to 6 feet of vertical growth, and would have easily gone much farther if there was anything else for it to twine around. Leaves are solid green, a single leaf per stem, alternating, flat, broad, with small teeth. No signs of flowering have appeared at all yet. Does anyone know what this is? Thank you!

Phoenix, Arizona