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Found in Kustaankartano, Helsinki, Finland in June 2015.
(for closeup view, copy image URL and open in new window and then zoom in)
It is one of the many species and hybrids of Clematis that is grown in gardens. It looks similar to the common Clematis alpina but might be a closely related species or à hybrid.
(Picture of C. alpina fr.o.m. Wikipedia)