Any suggestion on what this could be? Sorry, no leaves. The background green at the bottom may belong to this flower but no guarantee. This was my friend's random shooting.
It is a forest at mid latitudes of Russian Europe. Close to the origin if Volga river. He does not remember any other details.
I checked all Linum species known for Europe, none matches. Plus, the sepals in Linum stay with the fruit, unlike this plant. Thanks, Tyrlych.
Lysimachia vulgaris (Primulaceae). Cheers, Harri Harmaja http://www.fmnh.helsinki.fi/users/harmaja/vasculars.htm
My guess is a member of the ranuncula family, some kind of anemone. I have never met a member of the family I didn't like and this one is very nice with that fine red line on the caylx or do I mean sepals?
Thanks, Harri! Perfect match! The only problem is Lysimachia vulgaris inflorescence usually has many flowers in raceme whereas this plant has a single flower. It is either underdeveloped L. vulgaris or some other Lysimachia poorly represented by pictures. I checked some of them and they do not match so well as Lysimachia vulgaris. I looked also through Ranunculaceae suggestion and could not find a match. Thanks, Johnny!