Thanks to your suggestions now I know that those flowers are Helleborus!
...I didn't imagine they grow spontaneously in the field...I came back to pick some more...
...I've transplanted some of them in my garden hoping they'll blossom next year...cross the fingers!
I want to thank you for all your nice messages...I've been a bit absent on the blog in the last days...Spring is finally coming, I like spending my free time outside and my eyes need to rest...I hope you forgive me if I cannot visit you as often as I'd like! I try to read your blogs everyday, but sometimes without leaving a message!
Wish you all a faboulous Spring day!