Opuntia tuna (L.) Mill. Engl.: elephantear pricklypear, tuna. Sven.: buskopuntia.
Classic texts: Sturtevant 1919.
Henriette's herbal is one of the oldest and largest herbal medicine sites on the net. It's been online since 1995, and is run by Henriette Kress, a herbalist in Helsinki, Finland.