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

wyndesnow wrote:
And one more view. A bit more information the pictures were taken in August, however, the picture of the flower was taken in October. I did read some information on Clematis on the Web (thank you for the reference) and I believe it is a Group 3. The site said I needed to cut back in February. I checked it at ground level today and there is currently no growth that I can see. Would it be safe to cut it back this week? We are going to have nice weather and I will do it this week. I don't want to kill it just get it under control. I also think that I am going to have to try and split it up because the vines from last year at the base are approximately 1 - 1-1/2 inches in diameter perhaps more in the thicker parts.

I really do appreciate your help.