Book  (Oct 2001)  Page(s) 135.  Includes photo(s).
 
Clematis 'Bowl of Beauty'
Evergreen/Armandii Group
(C. armandii 'Bowl of Beauty')
Jan Fopma (Netherlands) 1992
Selected form of C. armandii
... single, pure white flowers... bowl shaped when young, becoming flatter as the four to six tepals mature. Stamens are creamy white... Best against a south- or southwest-facing wall or fence... Old leaves turn brown and drop in summer...