Psychedelic plants
Psychedelic Plants are plants that contain psychedelic drugs.  Some of them have been used for thousands of years for religious purposes.

# Cannabis
Main article: Cannabis
Cannabis (Marijuana) is a popular and unique psychedelic plant.  Cannabis is also unique because it contains a psychedelic substance, THC, that contains no nitrogen and is not an indole, phenethylamine,  anticholinergics (deliriant), or a disassociative drug. It is the weakest of the psychedelics but can produce hallucinations at higher doses. Currently, certain universities and research firms are studying the medicinal effects of cannabis. Many US states such as California and many countries have created a Medical Cannabis law to allow patients to use cannabis as (among other things) a pain killer, appetite suppressant and appetite stimulant.

# Plants containing psychedelic tryptamines
Many of the psychedelic plants contain DMT, which is either snorted (Virola, Yopo snuffs), smoked, or drunk with MAOIs (Ayahuasca).  It can not simply be eaten, and it needs to be extremely concentrated to be smokable, since the user needs to smoke all of it in a minute or else tolerance builds rapidly.
Acanthaceae:
- Justicia pectoralis, DMT in leaves
Aizoaceae:
Apocynaceae:
- Voacanga africana:  Iboga alkaloids
Fabaceae family (Leguminosae):
Caesalpinioideae (subfamily of Fabaceae) :
- Petalostylis cassioides:  0.4-0.5% tryptamine, DMT, etc. in leaves and stems
- Petalostylis labicheoides, Tryptamines in leaves and stems, MAO's up to 0.5%
List of Acacia Species Having Little or No Alkaloids in the Material Sampled:
0% \le C \le 0.02%, C...Concentration of Alkaloids 
Other Plants Containing DMT:
Lauraceae:
- Nectandra megapotamica, NMT
Malpighiaceae family:
- Diplopterys cabrerana:  DMT 0.17-1.74%, average of 0.47% DMT
Myristicaceae (Nutmeg family):
- Horsfieldia superba:  5-MeO-DMT and beta-carbolines
- Iryanthera macrophylla:  5-MeO-DMT in bark
- Iryanthera ulei: 5-MEO-DMT in bark
- Osteophloem platyspermum: DMT, 5-MEO-DMT in bark
- Virola genus; for example:
Ochnaceae:
- Testulea gabonensis:  0.2% 5-MeO-DMT, small quantities of DMT, DMT in bark and root bark, NMT
Ochnaceae:
Genus Pandanus (Screw Pine):  DMT in nuts
Poaceae family (Gramineae)
None of the above alkaloids are said to have been found in Phalaris californica, Phalaris canariensis, Phalaris minor and hybrids of P. arundinacea together with P. aquatica.
Polygonaceae:
- Erigonum sp.: DMT
Punicaceae:
- Punica granatum "DMT in root cortex"
Rubiaceae family:
Rutaceae family:
- Dictyoloma incanescens DC.: 5-MeO-DMT in leaves, 0.04% 5-MeO-DMT in bark
- Dutaillyea drupacea:  > 0.4 % 5-MeO-DMT in leaves
- Dutaillyea oreophila:  5-MeO-DMT in leaves
- Evodia rutaecarpa:  5-MeO-DMT in leaves, fruit and roots
- Limonia acidissima:  5-MeO-DMT in stems
- Melicope leptococca:  0.2% total alkaloids, 0.07% 5-MeO-DMT; 5-MeO-DMT in leaves and stems, also "5-MeO-DMT-Oxide and a beta-carboline"
- Pilocarpus organensis:  5-MeO-DMT in leaves
- Vepris ampody:  Up to 0.2% DMT in leaves and branches
- Zanthoxylum procerum:  DMT in leaves
Urticaceae:
- Urtica pilulifera:  Bufotenin

# Other Indoles
Acoraceae:
- Acorus calamus, asarone

## Mescaline

# Plants containing beta-carbolines
Beta-carbolines are "reversible" MAO-A inhibitors.  They are found in some plants used to make Ayahuasca.  In high doses the harmala alkaloids are somewhat hallucinogenic on their own.
Apocynaceae:
Bignoniacea:
- Newbouldia laevis, Harman
Calycanthaceae:
Chenopodiaceae:
- Hammada leptoclada, Tetrahydroharman, etc.
- Kochia scoparia, Harmine, etc.
Combretaceae:
- Guiera senegalensis, Harman, etc.
Cyberaceae:
- Carex brevicollis, Harmine, etc.
- Carex parva, Beta-carbolines
Elaeagnaceae:
Gramineae:
Lauraceae:
- Nectandra megapotamica, Beta-carbolines
Leguminosae:
- Acacia baileyana, Tetrahydroharman
- Acacia complanata, Tetrahydroharman, etc.
- Burkea africana, Harman, etc.
- Desmodium gangeticum, Beta-carbolines
- Desmodium gyrans, Beta-carbolines
- Desmodium pulchellum, Harman, etc.
- Mucuna pruriens, 6-Methoxy-Harman
- Petalostylis labicheoides, Tetrahydroharman; MAO's up to 0.5%
- Prosopis nigra, Harman, etc.
- S. puchellum, Beta-carbolines
Loganiaceae:
- Strychnos melinoniana, Beta-carbolines
- Strychnos usambarensis, Harman
Malpighiaceae:
Myristicaceae:
- Gymnacranthera paniculata, Beta-carbolines
- Horsfieldia superba:  Beta-carbolines
- Virola cuspidata, 6-Methoxy-Harman
- Virola rufula, Beta-carbolines
- Virola theidora, Beta-carbolines
Ochnaceae:
- Testulea gabonensis, Beta-carbolines
Palmae:
- Plectocomiopsis geminiflorus, Beta-carbolines
Papaveraceae:

## Passifloraceae:
Polygonaceae:
- Calligonum minimum, Beta-carbolines
- Leptactinia densiflora, Leptaflorine, etc.
- Nauclea diderrichii, Harman etc.
- Ophiorrhiza japonica, Harman
- Pauridiantha callicarpoides, Harman
- Pauridiantha dewevrei, Harman
- Pauridiantha lyalli, Harman
- Pauridiantha viridiflora, Harman
- Simira klugii, Harman
- Simira rubra, Harman
- Uncaria attenuata, Harman
- Uncaria canescens, Harman
- Uncaria orientalis, Harman
Rubiaceae:
- Borreria verticillata, Beta-carbolines
- Leptactinia densiflora, Beta-carbolines
- Nauclea diderrichii, Beta-carbolines
- Ophiorrhiza japonica, Beta-carbolines
- Pauridiantha callicarpoides, Beta-carbolines
- Pauridiantha dewevrei, Beta-carbolines
- Pauridiantha yalli, Beta-carbolines
- Pauridiantha viridiflora, Beta-carbolines
- Pavetta lanceolata, Beta-carbolines
- Psychotria carthagenensis, Beta-carbolines
- Psychotria viridis, Beta-carbolines
- Simira klugii, Beta-carbolines
- Simira rubra, Beta-carbolines
- Uncaria attenuata, Beta-carbolines
- Uncaria canescens, Beta-carbolines
- Uncaria orientalis, Beta-carbolines
Rubiaceae:
- Araliopsis tabouensis, Beta-carbolines
- Findersia laevicarpa, Beta-carbolines
- Xanthoxylum rhetsa, Beta-carbolines
Rutaceae family:
- Evodia species:  Some contain carbolines
- Melicope leptococca:  Beta-carboline
Sapotaceae:
- Chrysophyllum lacouritianum, Norharman etc.
Simaroubaceae:
- Ailanthus malabarica, Beta-carbolines
- Perriera madagascariensis, Beta-carbolines
- Picrasma ailanthoides, Beta-carbolines
- Picrasma crenata, Beta-carbolines
- Picrasma excelsa, Beta-carbolines
- Picrasma javanica, Beta-carbolines
Solanaceae:
- Vestia lycioides, Beta-carbolines
Symplocaceae:
- Symplocos racemosa, Harman
Tiliaceae:
- Grewia mollis, Beta-carbolines
Zygophyllaceae:

# Other psychedelic plants
Convolvulaceae:
Apocynaceae family:
- Catharanthus roseus is (perhaps unpleasantly) "hallucinogenic."
- Vinca minor
Aquifoliaceae family:
- Ilex guayusa, which is used as an additive to some versions of Ayahuasca.  According to the Ecuadorian indigenous, it is also slightly hallucinogenic on its own, when drunk in high enough quantities.
Euphorbiaceae family:
- Alchornea floribunda, Yohimbine
Loganaceae family:
- Desfontainia spinosa, causes visions
Lythraceae family:
- Heimia myrtifolia, auditory
- Heimia salicifolia, auditory