Book  (Oct 2001)  Page(s) 147-148.  Includes photo(s).
 
Clematis 'Chili'
Atragene Group
(C. macropetala 'Chili', C. macropetala 'Harry Smith')
Harry Smith (Sweden) from wild seed collected in the Chili region of China, 1922
Selected form of C. macropetala
... nodding, pale grey-blue semi-double flowers... four broad tepals... enclosing at least another four narrower and slightly shorter petal-like staminodes of a similar colour...