I was thinking Abundance as well but now that mine is blooming I checked it out and the pistil and stamens are not the same as in your picture. In Abundance they are the same length and a light yellowish colour where your photo clearly shows longer pistils than stamens and they are purplish blue in colour. I find most of my viticella clematis of this colour range to be very difficult to photograph and get good representation of colour and I find that the flowers themselves can vary quite a bit in colour intensity with the weather.