Oh, my goodness. There are a number of actively used therapeutics and anti-cancer medicines that were “discovered” by western scientists but were directed to those researchers by indigenous people in the form of plants—Pacific yew, for example—that had been used since time immemorial to treat a number of ailments. Some of these anti-cancer drugs are the largest money-making drugs that big pharma is using, so just in drug discovery alone there are a number of examples.
The anti-cancer medicines are some that I would point to.