Magazine  (1877)  Page(s) 267.  
 
Clematis amethystina plena (Jackman), s. de patens; double blanc [?].

Book  (1872)  Page(s) 134.  
 
C. PATENS AMETHYSTINA PLENA (Lemoine).—A variety of the patens group, and resembling that plant in habit and foliage. The flowers are loose, double, and of a French-white colour. It must now be ranked amongst the varieties of second- class merit.

Magazine  (1865)  Page(s) Vol. 16, p. 39.  
 
C. patens amethystina plena (Lemoine)