Circaea lutetiana

Circaea lutetiana, known as enchanter's-nightshade, is a plant in the evening primrose family, Onagraceae.

The genus name comes from the enchantress Circe of Greek mythology and the generic designation is derived from Lutetia, the Latin name for Paris. Paris at one time was known as the "Witch City". Despite its name it is not especially toxic, but contains a lot of the astringent tannin.