Book  (Oct 2001)  Page(s) 190.  Includes photo(s).
 
Clematis 'Floralia'
Atragene Group
Magnus Johnson (Sweden) Introduced (in England) 1980s
C. macropetala x C. ochotensis
... nodding, semi-double, powder-blue flowers are composed of four broad tepals, each 4 cm (1.5 in) long and tapering to a point. The tepals of early flowers are sometimes tinged with green as they open. Flowers are borne on old wood... there is often a small flush of flowers later in the summer...