The scientific or taxonomic name would be Euphorbia lathyris.
The scientific or taxonomic name would be Euphorbia esula.
Any arbitrary quantity of resiniferatoxin, which is the most piquant substance known to man and can be extracted from a Moroccan cactus called the resin spruge. Be warned that consumption of the resulting salsa causes serious chemical burns to the digestive tract and is often fatal. However, in very small quantities, it can be used as an analgesic of questionable safety.