periwinkle plant derivative: an antineoplastic drug used to treat some forms of cancer
antineoplastic: any of several drugs that control or kill neoplastic cells; used in chemotherapy to kill cancer cells; all have unpleasant side effects that may include nausea and vomiting and hair loss and suppression of bone marrow function
bulbil: small bulb or bulb-shaped growth arising from the leaf axil or in the place of flowers