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Hallucinogenic plants, fungi, and animals (from the Psychoactive Drug entry on Quick Seek)

Among the best-known hallucinogenic plants and fungi are:

Plants
Psychedelics
Ayahuasca (contains DMT and an MAOI, commonly Banisteriopsis caapi with Psychotria viridis)
Epená (Virola sp.) (contains 5-MeO-DMT and DMT)
Hawaiian baby woodrose (Argyreia nervosa) (contains Ergine)
Ololiuhqui/Coaxihuitl (Turbina/Rivea corymbosa) (contains Ergine)
Tlitliltzin/Badoh Negro (Ipomoea violacea) (contains Ergine)
Iboga (Tabernanthe iboga) (contains ibogaine)

Cacti psychedelics
Peruvian Torch cactus (Trichocereus peruvianus) (contains mescaline)
Peyote cactus (Lophophora williamsii) (contains mescaline)
San Pedro cactus (Trichocereus pachanoi) (contains mescaline)

Quasi-psychedelics
Cannabis (contains THC)
Sinicuichi (Heimia salicifolia) (questioned hallucinogenic activity)
Nutmeg (Myristica fragrans) (questioned hallucinogenic activity)

Dissociatives
Iboga (Tabernanthe iboga) (contains ibogaine)
Diviner's sage (Salvia divinorum) (contains salvinorin A)

Deliriants
Deadly nightshade (Atropa belladonna) (contains tropane alkaloids)
Floripondio (Brugmansia sp.) (contains tropane alkaloids)
Henbane (Hyoscyamus niger) (contains tropane alkaloids)
Mandrake (Mandragora sp.) (contains tropane alkaloids)
Thorn Apple/Jimson Weed (Datura sp.) (contains tropane alkaloids)

Fungi
Psychedelics
Psilocybe mushrooms (Psilocybe sp. and some Conocybe, Panaeolus and Stropharia) (contain psilocybin and psilocin)
Ergot fungus (Claviceps purpurea) (not hallucinogenic in itself, but contains LSD precursors)

Dissociatives
Fly Agaric mushroom (Amanita muscaria) (contains muscimol)

Animals
Psychedelics
Psychoactive toads (Bufo alvarius) (contain 5-MeO-DMT and Bufotenine)