"The bulb of a flower in the Amaryllis family, called Boophane disticha, or the Bushman Poison Bulb. Studies have shown that the bulb -- which was also used by southern Africans to help mummify bodies -- contains buphanidrine, an alkaloid, like codeine and morphine (although it is not related to them) with hallucinogenic and pain-killing properties. According to botanist Ben-Erik van Wyk of Rand Afrikaans University in Johannesburg, South Africa, the dosage of buphanidrine necessary to reduce pain is very close to the toxic dose, "but in a very experienced traditional healer's hands it should be safe. They usually assess the strength of a bulb by testing it on themselves."
"In addition, warriors sometimes ingested a hallucinogenic mushroom containing a toxin called muscimol. The chemical, present in fly agaric -- a mushroom that can attract and kill flies -- is said to induce a state of expanded perception in those who ingest it. Warriors who consumed those mushrooms, researchers speculate, might have been utterly without fear, believing themselves impervious to British bullets."