Cactus Realm

Echinopsis pachanoi San Pedro cactus is a cactus native to the Andes Mountains   of Peru, and Ecuador.

Euphorbia resinifera originates from Morocco. It occurs on the slopes of the Atlas Mountains. It is a species of spurge which contains resiniferatoxin (a capsaicin, used in medicine)

Tephrocactus articulatus. originate in Argentina, very easy to grow. subfamily Opuntioideae of the plant family Cactaceae.  Can grow quite tall and have white flowers.