Ooooo that is pretty and I also would love to know !! Hopefully someone expirienced can let us know .

It blooms for a long time and It doesn't grow to high.

Maybe 'Marmori'?

Marmori is the first name that popped into my head, too, but I'm not an expert.

I want to thank both of you for posting the name of the clematis for me. It is a pretty clematis. And blooms most of the summer.

kinda looks Blue Angel also.

My young Blue Angel sported creamy anthers ~ I doubt it's blue Angel. It's a beautiful light blue I love!

It is 'Marmori'

Here is a link that might be useful: Marmori