*Catharanthus roseus* (Madagascar periwinkle) is well-known for containing vinca alkaloids, such as vinblastine and vincristine, which are potent anti-cancer drugs used in the treatment of various types of cancer, including leukemia and lymphoma. While other plants in the options have medicinal properties, *Catharanthus roseus* is specifically recognized for its anti-cancer constituents found in its leaves and other parts.