Claudius assassinated Hamlet's father by pouring the "juice of cursed hebenon" (1.5.63) in his ear while he slept in his orchard. Hebenon is a folk name for Henbane, the expressed juice of the fresh plant, Hyoscyamus niger. Other folk names for Henbane include Black Nightshade, Cassilago, Devil's Eye, and Jupiter's Bean.
