Book  (Oct 2001)  Page(s) 185.  Includes photo(s).
 
Clematis 'Evithree'
Trade name: Anna Louise
Raymond Evison (England) before 1990
Introduced by Guernsey Nursery 1993
Parentage unknown
... single, striking, violet flowers... six to eight tepals, each with a red-purple bar along the centre...