Good website to ID Clematis
I know a lot of people (including me!) post on here asking for help on identifying their clematis vines.
I found this website and it really helped me. Just type in "Clematis" under Common Name and enter your zone. It will show you a list of Clematis vines that grow in your area and if you click on the name it will show you a picture as well.
Hope this helps!
Here is a link that might be useful: Plant Identifier