Cat’s Claw, also known by its Spanish name as Una de Gato is a high-climbing, woody plant that grows profusely in the upper Amazon regions of Peru, Columbia, Ecuador, and other Latin American countries. Its botanical name, Uncaria, comes from the Latin uncus, for “hook.” And it is the vine’s clawlike stems that allow it to climb trees and other vegetation up into the forest canopy. Two species of cat’s claw are harvested for medicinal purposes, Uncaria guianensis, used mainly in Europe and Uncaria tomentosa, the one most commonly imported into the United States. Among the herbal practitioners of South America, the two species are considered interchangeable.