A little bit shady

Enchanter's nightshade, lurking in dim undergrowth and dank garden corners, will never win any prizes for its tiny modest flowers but it possesses one of the most delightful of plant names, rivalling, to my mind, such as dog's mercury, lady's bedstraw and viper's bugloss.

Its Latin name, Circaea lutetiana, supplies the clue: Circe was the sorceress who used a herb-laced potion to turn Odysseus's crewmen into swine. Mediaeval herbalists reckoned it was this plant she used to do the magic.
(Actually it has very little potency but its tiny burrs are the very devil to remove from woolly socks.)