Circaea lutetiana

Circaea lutetiana, known as broad-leaved 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 specific designation is derived from Lutetia, the Latin name for Paris, which was sometimes referred to as the "Witch City". Despite its name it is not especially toxic, but contains a lot of the astringent tannin....read more on Wikipedia.