John the Conqueror
John the Conqueror, also known as High John the Conqueror, John de Conquer, and many other folk variants, is a folk hero from African-American folklore. He is associated with a certain root, the John the Conqueror root, or John the Conqueroo, to which magical powers are ascribed in American folklore, especially among the hoodoo tradition of folk magic. It's also known that the seeds of plants belonging to the genus Ipomoea contain a LSD-like psychedelic substance (ergine).
Folk hero 
John the Conqueror was an African prince who was sold as a slave in the Americas. Despite his enslavement, his spirit was never broken and he survived in folklore as a sort of a trickster figure, because of the tricks he played to evade his masters. Joel Chandler Harris's 'Br'er Rabbit' of the Uncle Remus stories is said to be patterned after High John the Conqueror. Zora Neale Hurston wrote of his adventures ("High John de Conquer") in her collection of folklore, The Sanctified Church. She also makes reference to the root in Their Eyes Were Watching God.
In one traditional John the Conqueror story told by Virginia Hamilton, and probably based on "Jean, the Soldier, and Eulalie, the Devil's Daughter", John falls in love with the Devil's daughter. The Devil sets John a number of impossible tasks: he must clear sixty acres (25 ha) of land in half a day, and then sow it with corn and reap it in the other half a day. The Devil's daughter furnishes John with a magical axe and plow that get these impossible tasks done, but warns John that her father the Devil means to kill him even if he performs them. John and the Devil's daughter steal the Devil's own horses; the Devil pursues them, but they escape his clutches by shape-shifting.
In "High John De Conquer",[clarification needed] Zora Neale Hurston reports that:
like King Arthur of England, he has served his people. And, like King Arthur, he is not dead. He waits to return when his people shall call him again ... High John de Conquer went back to Africa, but he left his power here, and placed his American dwelling in the root of a certain plant. Only possess that root, and he can be summoned at any time.
John the Conqueror root 
The root known as High John the Conqueror or John the Conqueror root is said to be the root of Ipomoea jalapa, also known as Ipomoea purga, an Ipomoea species related to the morning glory and the sweet potato. The plant is known in some areas as bindweed or jalap root. It has a pleasant, earthy odour, but it is a strong laxative if taken internally. It is not used for this purpose in folk magic; it is instead used as one of the parts of a mojo bag. It is typically used in sexual spells of various sorts and it is also considered lucky for gambling. It is likely that the root acquired its sexual magical reputation because, when dried, it resembles the testicles of a dark-skinned man. Because of this, when it is employed as an amulet, it is important that the root used be whole and unblemished. Dried pieces and chips of the root are used in formulating oils and washes that are used in other sorts of spells.
Cecil Adams has written that John the Conqueror root is the root of St. John's wort. St. John's wort root is thin and thread-like root, while John the Conqueror root is a tuber. John the Conqueror root is carried by the user, and the spell is cast by rubbing the root, which could not be done with a filamentous root.
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Other roots are linked to the same body of legends.
Low John is the root of the trillium or wake-robin, Trillium grandiflorum. It is carried on the person for assistance in family matters. It is also known as Dixie John or Southern John, and additionally is the basis for a hoodoo formula called Dixie Love Oil.
"Chewing John" is galangal, Alpinia galanga – a member of the ginger family. This is chewed much as chewing tobacco is chewed, to sweeten the breath and to calm the stomach. It is said that if you spit the juice from chewing this root onto the floor of a courtroom before the judge enters, you will win your case. Other names for this root are Little John and Little John to Chew. (This is called "Low John" in the Deep South.)
||This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. (October 2012)|
- Hurston, Zora Neale (1990). Mules and Men. Harper Perennial. ISBN 978-0060916480.
- Hurston, Zora Neale (1981). The Sanctified Church: The Folklore Writings of Zora Neale Hurston. Turtle Island Foundation. ISBN 978-0913666449.
- Long, Carolyn Morrow (2001). Spiritual Merchants: Religion, Magic, and Commerce. University of Tennessee Press. ISBN 978-1572331105.