Clematis Dr Rupple.  This is growing in my garden, bought from BQ a few years ago.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/27888585@N08">Paul Johnson</a>
CC BY 2.0
<p><a rel="nofollow" class="external text" href="https://www.flickr.com/photos/paulgjohnson/3556115615/">Clematis Dr Rupple</a>
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<ul><li>Uploaded by <a href="//commons.wikimedia.org/wiki/User:Uleli" title="User:Uleli">uleli </a></li></ul>