Stunning picture, Martin.
A google search resulted in the following information:
Helleborus x sternii is a hybrid between the robust, cold-hardy, green-flowered H. argutifolius from Corsica and Sardinia with H. lividus from the Balearic islands, which has red highlights and smoky pink flowers but is tender. It was first exhibited in 1947 and is named after the celebrated British plantsman, Sir Frederick Stern.
My guess is that it was created by the hand of man.