Book  (Oct 2001)  Page(s) 179.  Includes photo(s).
 
Clematis 'Etoile de Paris'
Christen (France) ca. 1885
Parentage unknown
... single, rather large, well-formed, deep mauvish blue flowers... eight short, fine-pointed tepals, each with a reddish central bar...

Website/Catalog  (1924)  Page(s) 106.  
 
Etoile de Paris (Patens). Large, 10 sépales, violet clair.