Hi Cetti, Nice photo's. I can see how one might think that the leaves and the flowers of this plant are from differant plants, as they do not appear to be conected, the flowers and leaves emerge from the ground in many differant places, not always apparently together, some years the flowers may not come up at all (just leaves) but they are conected below ground to a large tuberous root, which functions as a storage organ and stores nutrients in the form of starch for the folowing year.
The flower or spathe is unusual in that it attracts flies to pollenate it by producing a faul smell, like a rotting carcass, the fly becomes traped in the base of the spathe by downward pointig hairs, the fly is then held prisoner over night and while attempting to escape inadvertently transfers pollen and fertilizes the flower, by morning the the hairs have withered and the fly is released and may again be attracted to another flower.
If you live on the south coast of England or the Chanel Islands, you may be lucky to see another closely related relative (Arum italicum) growing wild, which many "improved" garden forms have arose from, often with white marbled leaf zones.
It must be a tough life being a fly!! Cheers