Book  (Oct 2001)  Page(s) 128.  Includes photo(s).
 
Clematis 'Betty Risdon'
Vince and Sylvia Denny (England) 1996
Named after the former treasurer of the British Clematis Society
C. 'Yellow Queen' (C. 'Moonlight') x C. 'Wada's Primrose' x C. 'Kathleen Wheeler'
... single, well-formed, rich plum-pink flowers... seven or eight gently overlapping, rounded, textured tepals, with creamy pink margins and prominent ribs along the centre... yellow filaments and anthers...