The term 'drug-yielding shrub' refers to two plants, SENNA and IPECAC. SENNA is a flowering plant in the legume family, native to tropical regions of the world. It has been used for centuries as a laxative and is still used today in many over-the-counter medications. IPECAC is a shrub native to Brazil and is known for its medicinal properties. It is most commonly used as an emetic, or a substance that induces vomiting. Both SENNA and IPECAC are important sources of drugs for medical use.