Aporphine is an alkaloid that forms the core of a class of quinoline alkaloids. Mescaline and many indole alkaloids (such as psilocybin, dimethyltryptamine and ibogaine) have hallucinogenic effect. It contains steroidal alkaloids such as cyclobuxine. The chemical constituents include isoquinolone alkaloids, especially berberine. Poppy seeds do contain trace amounts of opium alkaloids, including morphine. Sick animals tend to forage plants rich in secondary metabolites, such as tannins and alkaloids. Belladonna nectar is transformed by bees into honey that also contains tropane alkaloids. Poison hemlock contains traces of other similarly poisonous alkaloids. Reserpine is one of dozens of indole alkaloids isolated from the plant "Rauvolfia serpentina". Alkaloids and acids form salts of various strengths. Bloodroot produces benzylisoquinoline alkaloids, primarily the toxin sanguinarine. The seeds contain more strychnine than other commercial alkaloids. Opium contains two main groups of alkaloids. The original "vinca" alkaloids are natural products that include vincristine and vinblastine. It is frequently associated with substances like tannins and alkaloids.