Datura

Garcias ab Horto [...] makes mention of an herb called datura, “which, if it be eaten for twenty-four hours following, takes away all sense of grief, makes them incline to laughter and mirth” [...].

"Apple of Death" is what the Jungle call thorn-apple or dhatura, the readiest poison in all India.

"Suffice it that it was of the datura family which supplies deadly poisons as well as powerful medicines."

Datura did grow in Haiti, three species, all of them introduced from the Old World.

It was a decoction of datura that wrung the truth from the old woman, by sending her into a trance from which she never recovered.