Botanical name of Henbane is
Hyoscyanus niger
Hyoscyamus niger, commonly known as Henbane, black henbane and stinking nightshade is a poisonous plant belonging to family Solanaceae. Henbane is grown mainly for pharmaceutical purposes. Henbane is used in traditional herbal medicine for the ailments of bones, rheumatism, toothache, asthma, cough and also used as a sedative, analgesic etc. So, the correct answer is 'Hyoscyamus niger'.