Clematis: Can you help me determine what kind of clematis this is?, 0 by wyndesnow

wyndesnow wrote:
Hi! I live in Chicago, IL. My husband and I moved into our home last March and I was pleasantly surprised to find that we had a clematis off the back deck. I would like to prune it to train it onto a trellis (or 2 or 3) because as you will see from the picture, it became unruly last year. When we moved into the house in March 06, the vines from the previous year was there, we did nothing with them unsure of what type it was. The new growth entwined itself on the old growth but the new growth came from the ground. It did not flower last year (only 2 small pinkish flowers). My husband wants me to cut it down because I was outside everyday last summer making sure that during the night it had not grown into the patio furniture.

Your help and suggestions are greatly appreciated.

Wendy