Dracunculus vulgarisDracunculus vulgaris (aka Arum dracunculus) is variously called the Dragon Arum, Voodoo Lily, Ragons, Snake Lily, Black Arum, Black Dragon, Dragonwort, & Stink Lily. In Greece it is called Drakondia, the dragon or serpent being the long spadex inside the enormous maroon-lipped spathe.
It is native to the Balkans, to Mediterranean Europe, Greece, the isle of Crete & the Aegean Islands, all the way to Southwest Turkey. In some places it's a veritable weed in its natural settings, albeit a weed of splendid countenance.
Though it looks like it ought to be tropical, it is not; & it transfers to the temperate garden with great ease, doing well in zones 5-8.
Voodoo LilyNorthwest gardeners have reported them spreading quite wildly, & requiring no special attention of any kind. They spread by self-seeding & by bulb offsets. If the seedheads are not collected, they will eventually fall over in the garden, where beetles or ants cart them away, spreading the voodoo lily more distantly. The penultimate photo below shows one of the green seed cobs in August. The final photo shows the ripened cob in October, when the stalk has softened has toppled to the ground so insects will clean & disperse the seeds.