DMT, or N,N-dimethyltryptamine, turns up across a remarkably wide range of plant families, from tropical trees and shrubs to common pasture grasses. It is an indole alkaloid found in both plants and animals, and its presence in the botanical world spans at least four continents and dozens of genera.1PubMed Central. Neuropharmacology of N,N-dimethyltryptamine The reasons plants make it are less settled than the chemistry itself, and the answer touches on everything from enzyme evolution to chemical defense to sheer metabolic accident.
The Major Plant Sources
No single plant family has a monopoly on DMT. The compound has been confirmed in species belonging to the legume family (Fabaceae), the coffee family (Rubiaceae), the grass family (Poaceae), and several others. A few genera come up repeatedly in the scientific literature and in traditional use.
Mimosa tenuiflora (also known as Mimosa hostilis or jurema) is one of the best-studied sources. This thorny tree, native to northeastern Brazil and parts of Central America, concentrates DMT in its bark, especially the root bark. Analyses show the root bark contains roughly 0.5 to 1.7 percent DMT by dry weight, while the stem bark runs around 0.3 percent. The leaves and flowers carry far less, typically in the range of 0.01 to 0.03 percent, and the seeds show essentially no alkaloid content.2PubMed Central. Extraction and Characterization of N,N‑Dimethyltryptamine from Mimosa tenuiflora: A Multivariate Approach That difference of roughly two orders of magnitude between bark and leaf tissue is a useful detail: if you see a DMT percentage cited for Mimosa, the plant part matters enormously.
Psychotria viridis (chacruna) is probably the second most famous source. It is a shrub in the coffee family, native to the Amazon basin, and its leaves are the traditional DMT-containing ingredient in ayahuasca. Unlike Mimosa, which stores the alkaloid in bark, Psychotria concentrates it in leaves. Field studies of P. viridis leaf tissue have recorded DMT concentrations that vary widely, from roughly 12.7 to 103.7 percent of the baseline value at a single collection site, with an average variation of about 38.5 percent across the study period.3Journal of the Brazilian Chemical Society. Influence of Environmental Factors and Cultural Methods on the Content of N,N-Dimethyltryptamine in Psychotria viridis (Rubiaceae) That degree of fluctuation within the same site underscores how much growing conditions shape what is actually in the tissue.
Diplopterys cabrerana (chaliponga), a vine in the Malpighiaceae family, is another traditional admixture plant used alongside Banisteriopsis caapi in ayahuasca preparations. Its leaves contain DMT as well, though it is less commonly studied than Psychotria viridis.4PubMed. Monoamine oxidase inhibitors in South American hallucinogenic plants: tryptamine and beta-carboline constituents of ayahuasca
Australian Acacia species form another well-known group. Chemical analysis has confirmed the presence of tryptamines, including DMT, along with beta-carbolines, histamines, and phenethylamines in certain Australian species.5PubMed Central. Rumors of Psychedelics, Psychotropics and Related Derivatives in Vachellia and Senegalia in Contrast with Verified Records in Australian Acacia There is a good deal of folklore and online anecdote about which Acacia species are active, and some of that folklore outpaces what has been verified in the lab. The same study noted the need to distinguish verified analytical records from rumors, which is a recurring theme with DMT-containing plants in general: many species are “reported” to contain it based on thin evidence, while a smaller number have been rigorously confirmed.
A Surprising Source: Pasture Grasses
DMT is not limited to tropical trees and jungle shrubs. Phalaris aquatica, a common pasture grass cultivated in temperate regions including Australia, produces both DMT and a close relative, 5-methoxy-DMT (5-MeO-DMT). This is not a pharmacological curiosity; it has practical veterinary consequences. Phalaris is known to cause toxicity in livestock, producing acute or chronic staggers and, in severe cases, sudden death. Field samples collected from a paddock where sudden death had occurred just days earlier showed elevated levels of 5-MeO-DMT and slightly elevated DMT compared with samples from surrounding areas.6Crop & Pasture Science. Changes in field concentrations of five phalaris alkaloids and their association with toxicity in pastures of Victoria, Australia Farmers in Australia and parts of the Mediterranean have dealt with phalaris staggers for decades. The grass is valued as a hardy, productive pasture species, so breeders have worked to develop low-alkaloid cultivars rather than abandon it entirely.
The presence of DMT in grasses is a good reminder that the compound is not intrinsically tied to any particular plant lifestyle or habitat. It shows up in fast-growing annuals, slow-growing hardwood trees, tropical shrubs, and temperate pastures. Whatever function DMT serves in plants, the machinery for making it is clearly not restricted to one narrow ecological niche.
How Plants Build DMT
The biosynthetic route from the amino acid tryptophan to DMT is surprisingly short. It takes only two enzymatic steps. First, a tryptophan decarboxylase removes a carboxyl group from tryptophan to produce tryptamine. Then a methyltransferase adds two methyl groups to the amine nitrogen, using S-adenosyl-L-methionine (SAM) as the methyl donor, converting tryptamine first to N-methyltryptamine and then to DMT.
A 2024 study published in Science Advances mapped this complete pathway in DMT-producing plant species used in traditional shamanic rituals. The researchers identified the specific enzymes responsible in Psychotria viridis: a tryptophan decarboxylase called PvTDC2 and a methyltransferase called PvNMT1. When they co-expressed both enzymes in the same cells, DMT and all pathway intermediates were produced without any need to feed in extra substrate.7Science Advances. Complete biosynthesis of psychedelic tryptamines from three kingdoms in plants They also found a functionally equivalent methyltransferase in Acacia, called AaNMT1, which catalyzed the same two methylation steps. The implication is that the enzymatic toolkit for making DMT is widespread across plant lineages, even though the specific genes differ.
What makes this research particularly striking is that the same team used those plant enzymes, along with fungal and animal counterparts, to reconstruct the full biosynthetic pathways for five psychedelic tryptamines (DMT, psilocin, psilocybin, bufotenin, and 5-MeO-DMT) within a single plant assay system.8Science Advances. Complete biosynthesis of psychedelic tryptamines from three kingdoms in plants The enzymes from plants, fungi, and animals could be mixed and matched because the underlying chemistry is so similar. This shared chemistry across kingdoms suggests the DMT biosynthetic pathway may have arisen independently multiple times in evolution, or that its components are so simple and useful that they have been retained wherever tryptophan metabolism occurs.
Why Do Plants Bother Making It?
This is the question where the evidence gets genuinely thin. The honest answer is that nobody has conclusively demonstrated a single ecological function for DMT in any plant species. There are several hypotheses, none of them proven beyond reasonable doubt.
The most commonly invoked idea is chemical defense. Many alkaloids serve as deterrents to herbivores, and DMT’s bitter taste and neurological effects on animals are consistent with that role. The phalaris grass example is suggestive: livestock that eat enough of it can become seriously ill or die, which would presumably discourage grazing on those plants. But DMT concentrations in most species are quite low, especially in the tissues herbivores typically eat (leaves, shoots), and plenty of herbivores graze on DMT-containing plants without obvious ill effects at normal intake levels. Whether the concentrations found in, say, Psychotria leaves are high enough to deter insect herbivores is an open question.
A second idea is that DMT is simply a metabolic byproduct. Tryptophan is a universal amino acid, and plants routinely methylate nitrogen atoms during normal metabolism. If you have a tryptophan decarboxylase and a nonspecific methyltransferase in the same tissue, DMT is a plausible side product. Under this view, DMT is not “for” anything in particular; it is chemical noise generated by enzymes whose primary jobs lie elsewhere. The fact that DMT concentrations are often very low and variable within the same plant lends some support to this interpretation.
A third possibility is that DMT plays a signaling or stress-response role within the plant itself. Some researchers have speculated that indole alkaloids may act as growth regulators or stress signals, analogous to the role of other tryptophan-derived compounds like indole-3-acetic acid (auxin), the main plant growth hormone. DMT is structurally related to auxin, and both derive from tryptophan. But structural similarity does not mean functional similarity, and no study has yet shown that DMT acts as a hormone or signaling molecule in plant tissue.
The reality is probably some combination of these. Alkaloid production in plants is often maintained by a mix of weak selective pressures rather than a single strong one. A compound that slightly deters some herbivores, slightly aids stress tolerance, and is cheap to produce from an existing pathway can persist in a species even without being critically important for survival. The fact that DMT shows up in such distantly related plant families, at such variable concentrations, and in such different tissues is consistent with a compound that does not have one essential job but has been “kept around” because it is easy to make and not costly to maintain.
What Makes DMT Levels Fluctuate
If you sampled the same plant twice a few months apart, the DMT content could differ substantially. Environmental conditions play a clear role. In Psychotria viridis grown in the Amazon, the relatively stable year-round temperatures appear to minimize seasonal swings in DMT concentration, keeping levels fairly consistent compared with plants grown in more variable climates.3Journal of the Brazilian Chemical Society. Influence of Environmental Factors and Cultural Methods on the Content of N,N-Dimethyltryptamine in Psychotria viridis (Rubiaceae) Outside the Amazon, in regions with sharper temperature swings or distinct dry and wet seasons, the variation tends to be larger.
Additional factors, including environmental characteristics, the way the plant material is prepared, and drying temperature, all influence DMT and related alkaloid concentrations in plant tissue intended for ayahuasca.9World Journal of Advanced Research and Reviews. Assessment of environmental condition and drying process of the plants on the concentration of alkaloids and cytotoxicity of traditional Ayahuasca Tea This matters for anyone interpreting published concentration data: a number pulled from one harvest, in one region, at one time of year, using one extraction method is not necessarily representative. The wide ranges reported in the literature are partly a reflection of genuine biological variability and partly a reflection of different analytical approaches.
Plant part is another major driver. As noted earlier with Mimosa tenuiflora, root bark can contain several times more DMT than stem bark, and stem bark can contain ten times or more what the leaves hold.2PubMed Central. Extraction and Characterization of N,N‑Dimethyltryptamine from Mimosa tenuiflora: A Multivariate Approach With Psychotria viridis, by contrast, leaves are the primary repository. These distribution patterns likely reflect differences in where the biosynthetic enzymes are expressed and how alkaloids are transported and stored within the plant.
The Ayahuasca Connection and Why Two Plants Are Used
DMT on its own is not orally active in humans. Enzymes in the gut (monoamine oxidases) break it down before it reaches the bloodstream in significant amounts. The traditional ayahuasca preparation solves this problem by combining a DMT-containing plant with Banisteriopsis caapi, a vine that contains beta-carboline alkaloids, primarily harmine, harmaline, and tetrahydroharmine, which inhibit monoamine oxidase A.10PubMed Central. Neurobiological research on N,N-dimethyltryptamine (DMT) and its potentiation by monoamine oxidase (MAO) inhibition: from ayahuasca to synthetic combinations of DMT and MAO inhibitors The beta-carbolines block DMT’s breakdown, allowing it to survive digestion and reach the brain.
The DMT-providing ingredient varies by region and tradition. In some preparations it is Psychotria viridis leaves; in others it is Psychotria carthagenensis or Diplopterys cabrerana. Banisteriopsis caapi itself contributes the monoamine oxidase inhibitors, and it also contains trace amounts of DMT, though these are not considered the primary source of the brew’s effects.4PubMed. Monoamine oxidase inhibitors in South American hallucinogenic plants: tryptamine and beta-carboline constituents of ayahuasca The combination represents what is sometimes called a pharmacological synergy: neither plant alone does what the combination achieves orally. How indigenous Amazonian peoples discovered this particular pairing across the thousands of plant species in the rainforest is a question that has fascinated ethnobotanists for decades and does not have a satisfying empirical answer.
DMT’s Chemical Relatives in Plants
DMT rarely exists in isolation. Plants that produce it typically also synthesize a suite of related tryptamine derivatives. 5-MeO-DMT (5-methoxy-N,N-dimethyltryptamine) is a close structural cousin that shows up in Phalaris grasses, certain Acacia species, and a handful of other plants. Bufotenin (5-hydroxy-DMT) is another relative, better known from toad skin secretions but also found in some plant seeds. N-methyltryptamine (NMT), the one-methyl intermediate on the way to DMT, accumulates in many of the same species.
This makes sense given the biosynthesis. The methyltransferase enzyme does not always complete both methylation steps efficiently, so NMT builds up as an intermediate. And if a hydroxylase or methoxylase acts on tryptamine or DMT, you get bufotenin or 5-MeO-DMT. The 2024 Science Advances study demonstrated exactly this versatility: by mixing enzymes from different kingdoms, they could steer the same tryptophan starting material toward psilocybin, bufotenin, 5-MeO-DMT, or DMT, depending on which enzymes were present.7Science Advances. Complete biosynthesis of psychedelic tryptamines from three kingdoms in plants The plant’s specific alkaloid profile depends on which enzymes it expresses and at what levels, not on fundamentally different chemical logic.
Australian Acacia species illustrate this cocktail effect well. Verified analyses have found not just DMT but also beta-carbolines, histamines, and phenethylamines in the same plant material.5PubMed Central. Rumors of Psychedelics, Psychotropics and Related Derivatives in Vachellia and Senegalia in Contrast with Verified Records in Australian Acacia That chemical diversity complicates any simple story about “what DMT does” for the plant. These alkaloids may work together in ways that a focus on DMT alone would miss, as a combined deterrent cocktail whose individual components are less effective in isolation.
How Researchers Measure DMT in Plant Tissue
Quantifying DMT in a plant sample is not as simple as grinding it up and running a test. The extraction method, the solvent used, the amount of plant material, and even whether an alkaline reagent is added to free the alkaloid from its salt form all affect the yield. A validated method for Mimosa tenuiflora inner bark used matrix solid-phase dispersion followed by gas chromatography with mass spectrometry, achieving a detection limit of 0.12 milligrams per gram of plant material.11PubMed. Determination of N,N-dimethyltryptamine in Mimosa tenuiflora inner barks by matrix solid-phase dispersion procedure and GC-MS Other labs use liquid chromatography, different extraction solvents, or different sample preparation steps, which means published DMT percentages from different research groups are not always directly comparable.
Optimized extraction from Mimosa tenuiflora stem bark in one recent study yielded about 3.45 percent DMT by weight under the best conditions, a figure achieved using a particular methodology and sample type.2PubMed Central. Extraction and Characterization of N,N‑Dimethyltryptamine from Mimosa tenuiflora: A Multivariate Approach That number is notably higher than the typical range cited for stem bark in the broader literature, which suggests extraction efficiency has a big effect on reported concentrations. When you read that a species contains “X percent DMT,” you are reading a number shaped as much by the analytical method as by the biology.
Why the Ecological Story Remains Incomplete
Plant biochemists have made real progress on the “how” of DMT production. The enzymes are identified, the pathway is mapped, and researchers can now produce DMT in engineered organisms. The “why” has not kept pace. Testing whether DMT actually deters herbivores would require feeding experiments with realistic concentrations, and those studies are hard to design, fund, and publish. Testing whether DMT serves as a growth signal would require knocking out the biosynthetic genes and observing what happens to the plant under controlled conditions, work that has not yet been done for DMT specifically.
Part of the difficulty is that DMT is a controlled substance in most jurisdictions, which creates regulatory barriers even for basic botanical research. Another part is that plant alkaloid ecology is a crowded field with thousands of compounds to study, and DMT, despite its cultural fame, is not an obvious priority for most agricultural or ecological funders. The result is a compound that is extraordinarily well characterized chemically and pharmacologically in humans, yet poorly understood in terms of what it does for the organisms that actually make it. The plants have been producing DMT for millions of years. We are still catching up on why.