What plant origins are of aspirin digitalis and quinine?

Aspirin is derived from the bark of the willow tree, specifically from salicylic acid found in its leaves and bark. Digitalis comes from the foxglove plant (Digitalis purpurea), which contains compounds that can strengthen heart contractions. Quinine is sourced from the bark of the cinchona tree, native to South America, and has historically been used to treat malaria. Each of these plants has played a significant role in traditional medicine and continues to be important in pharmacology.