Maybe Sauromatum venosum?

Here is a link that might be useful: Sauromatum

Possibly a Dracunculus?

Yes: dragon arum. Snake lily has a spotted spathe and flowers before the leaves, the flowers and leaves being borne separately.

if it's Dracunculus, Dragon Arum (as bboy and I suggest), it's decidedly NOT tropical. It's a hardy temperate plant. Insects or other animals can spread the seeds around (which may explain where your plant came from). It develops a bulbous root. The flowers will smell like rotting flesh for a short period of time (it's pollinated by insects attracted to carrion, such as flies).

I love my Dragon Arums. They are quite unique.