Moonflower|Ipomoea alba

The keeper of the secrets of the moon, this fairly nocturnal flower attracts the spirits of the night to its core: moths are often seen flocking around its home in wet thickets, hedges, hills, and terraces. The moths, of course, draw the bats, the other incarnations of Nyx. The Aztecs used an ointment which included the seeds of this plant to reduce the fear, and increase the willingness of religious sacrifices. Although -in medieval Spain- those who partook of the plant were said to commune with the Devil, it is still used by Mazatec healers (curandera) today to determine ailments of patients. The proper preparation of the seeds can produce an LSD-like hallucinogenic experience, which aids in the adjustment of attitudes, behavior patterns, and facilitates the acceptance of life and death. However, even when used correctly, the experience can be nauseating or sickening, and the plant is dangerous to those with a history of hepatitis or other liver disorders. It should never be taken by pregnant women, as it may cause an abortion.
Sources:
The Magical and Ritual Use of Herbs by Richard Alan Miller
Alchemy-works