How the corpse flower evolved its bizarre traitsNEWS | 17 March 2026The blooming of a titan arum, or corpse plant, is a spectacle like none other in the plant world. A pale spike resembling the decaying finger of a buried giant pushes up from the earth until it towers 10 feet above the ground. A massive petal-like structure unfurls to form a blood-red cape around the finger. The smell of rotting flesh fills the air. Then, some 36 hours later, the bloom is over. Seven years or more may pass before it happens again.
With its putrid stench, alien appearance and peculiar habits, the corpse plant disgusts and fascinates in equal measure. At any given time, botanical gardens, arboretums and nurseries around the world are making plans to share news about their specimen. They don’t know exactly when it will bloom—the titan arum works on no one’s schedule but its own—but they need to be ready when it does: this species, Amorphophallus titanum, often brings in more traffic to botanical institutions than any other species in their collections.
It’s not just the general public that finds the titan arum so captivating. Scientific interest in this monstrosity dates back to at least the late 1800s, when Italian botanists first formally described the species, which is endemic to the rainforests of western Sumatra. Researchers have been studying this floral phenomenon ever since.
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In my research as a plant evolutionary biologist, I mostly study members of an entirely different group of plants, the ferns. But I find myself drawn to the corpse flower because its mix of features suggests that it has an especially interesting evolutionary history. Recent investigations have illuminated how the corpse plant acquired its bizarre traits. The findings not only help to explain why the plant is the way it is but also offer fascinating examples of little-known factors that can significantly influence evolutionary outcomes. Put simply, the corpse flower can teach us about how evolution works.
To appreciate the corpse plant, it helps to understand its structure. When it’s not in bloom—the vast majority of the time—the plant basically consists of a giant tuberlike stem, which sits underground and stores energy in the form of starch, and a single massive leaf that grows aboveground and superficially resembles a small tree. The leaf lasts for about a year, producing food through photosynthesis and sending it to the tuber for safekeeping. When the leaf dies, the tuber goes dormant for a few months before sending up another leaf to convert sunlight into food.
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Once the tuber is big enough to fuel a more ambitious undertaking, the corpse plant can flower. It may be 10 years old before it can manage this feat. When it’s time to bloom, the plant produces a structure called an inflorescence instead of the usual leaf. This inflorescence is the bloom. It’s composed of two primary parts: the fingerlike spadix and the capelike spathe. Although it might seem unfamiliar, this floral structure is similar to that of the peace lily (Spathiphyllum) in your doctor’s waiting room—but scaled up and ready for Halloween.
People tend to think of the spadix and spathe as the corpse plant’s flower. But the actual flowers are dinky little structures at the base of the spadix—so reduced that they generally lack all the traditional floral organs, such as petals and supportive sepals. These flowers are also unisexual, with pollen-bearing flowers higher up on the spadix and seed-producing flowers lower down. The pollen-bearing flowers contain only a few pollen-making organs, and the seed-bearing flowers produce a single, tiny fruit. Both flower types are stripped down to their essential parts.
The corpse plant is an extraordinary example of evolutionary mimicry. Most of the flowering plants that are familiar to us have colorful, sweet-smelling blooms to attract bees, butterflies, birds, and other pollinators that help them reproduce. The corpse plant has a different strategy. It has evolved to look and smell like decaying meat so that it appeals to a different group of pollinators: the flies, beetles, and other insects that feed on carrion. The spathe and spadix have ripples, grooves, bumps and discolorations that are strikingly similar to those on the surface of rotting flesh. The stench takes the disguise to the next level.
Along with many other members of the genus Amorphophallus, the corpse plant has evolved highly specific sulfur-based compounds that mimic the smell of carrion. G. Eric Schaller of Dartmouth College and his colleagues recently identified a previously unknown component of the plant’s stinky odor, aptly named putrescine. This substance, in a form chemically identical to that found in the flower, also contributes to the odor of decaying animal meat. In both the corpse plant and decomposing animal flesh, this rank compound is derived from the breakdown of particular amino acids, the building blocks of proteins.
The corpse plant’s independent development of some of the exact same compounds as in rotting meat is remarkable. In most cases of mimicry in the natural world, the mimic is not an exact copy of the original. Consider, for example, ant-mimicking spiders, a group of spiders that, as their name suggests, cosplay as ants. Like all spiders, ant-mimicking spiders have eight legs. Ants, however, have just six legs and two antennae. As part of their disguise, the spiders hold their front two legs up and wave them around to give the appearance of the ant body plan. Evolution does not craft novelty from nothing; it tinkers with what it has. In the case of the corpse plant, the tinkering happened to lead to an identical final product.
A window cut into the spathe provides access to the pollen-bearing flowers. Genevieve Vallee/Alamy
Another extreme evolutionary innovation of the corpse plant helps to ensure that its fetid perfume travels far and wide to attract as many pollinators as possible. Many plants that rely on carrion insects for pollination have evolved mechanisms to produce heat, which carries the scent higher as it rises and distributes it throughout the nearby environment. The titan arum leverages a particularly fascinating means of doing this, as Schaller and his collaborators discovered.
The plant takes starch stored in its large underground stem and turns it into sugar. The sugar is then sent up through the fingerlike spadix and into mitochondria, where it is metabolized. Usually, when sugar is metabolized in mitochondria, it is used for the body’s energy production. But instead of capturing the energy and using it to power cellular processes, the corpse plant breaks the process of cellular respiration in the mitochondria and releases the energy as heat. During this process, the spadix can warm up to as much as 20 degrees Fahrenheit above the ambient temperature.
In just about any other scenario, the release of this energy would be horrible for a plant—a waste of precious reserves. In this instance, however, the excess heat broadcasts the rotten stench to more insects, thereby increasing the chance of pollination.
The strength of the odor emissions is mind-boggling. Rose Rossell, a Ph.D. candidate at Colorado State University, and her colleagues measured chemicals emitted by a conservatory corpse plant when it bloomed in 2024. They found that it emitted sulfur compounds at rates similar to those of landfills. But as powerful as the smell is, it’s not indelible. The researchers determined that polluted air can diminish the fragrance plumes and even change the chemical profile of the scent. In theory, these effects could reduce the number of pollinators that visit these plants in the rainforest, which is concerning because the species is endangered, with fewer than 1,000 plants estimated to remain in the wild.
The corpse plant is best known for its macabre flamboyance. Yet beyond its outlandish appearance and foul bouquet, the plant has another fascinating attribute, one that offers a window into evolution’s inner workings.
As a plant evolutionary biologist, I think the most intriguing thing about this species is the mismatch in the sizes of its structures. The corpse flower has much to teach us about one of my main areas of interest: how the growth and development of an organism relate to its evolutionary trajectory.
Horticulturists collect pollen from blooming corpse plants in their care to share with other botanical gardens and arboretums in an effort to help maintain the genetic diversity of the species. Matt Cardy/Getty Images
Evolutionary biologists have long tried to identify patterns of size change in organisms over time. The scientific literature abounds with debate over principles such as Cope’s rule, which proposes that animal lineages tend to increase in body size over time, and the Island rule, which holds that when mainland species colonize islands, large-bodied organisms evolve smaller sizes and small-bodied organisms become larger. The corpse plant exhibits a curious dichotomy in this regard. Whereas the blooming structure known as the inflorescence evolved gigantic proportions, the actual flowers have become dwarfed.
The co-occurrence of these two evolutionary trajectories, gigantism and dwarfism, in the same organism raises a host of questions. Why is the inflorescence so large? Why are the individual flowers so small? Which occurred first, the supersizing of the inflorescence or the shrinking of the flowers? What evolutionary processes enabled these changes?
Charles Davis of Harvard University and his colleagues have found that extremely large inflorescences and flowers (collectively called blossoms) have evolved multiple times, most often in species that are pollinated by carrion insects. They propose that large blossoms are adaptations to these pollinators, emitting more odor and enticing more insects to linger in their warm chambers, where they are safe from predators. Furthermore, just as these insects are attracted to big animal carcasses when choosing a place to lay their eggs, presumably because they provide more abundant food resources for developing larvae, so, too, may they be drawn to larger blossoms of carcass-mimicking plants. And attracting more pollinators increases the odds of a plant’s reproductive success.
But if the preferences of pollinators are driving the evolution of the corpse plant’s extreme proportions, why does it have such minuscule flowers? If there was selection for bigger blooms, why did Amorphophallus evolve toward gigantism in the inflorescence but not the individual flowers?
Although the corpse plant looks like a tree when it is not in bloom, the structure that resembles a trunk with branches and leaves is actually a single leaf. Nature Picture Library/Alamy
Before we can attempt to solve this mystery, we need to know about the timing of the evolution of these two traits: Which one evolved first? It’s the age-old chicken-and-egg question, and as in the case of that poultry-themed paradox, the answer lies in the evolutionary family tree. Let’s start with actual chickens as an example. If we look at birds and their closest relatives—the crocodilians, turtles, snakes and lizards—we see that with few exceptions, the species in these lineages lay eggs. We can conclude from that observation that their common ancestor laid eggs. Ergo, the egg came before the chicken.
What about the tiny flowers and large blooms of A. titanum? If we look at the evolutionary tree of the corpse plant, we see that every member of its family, Araceae, has small flowers. So do many members of other families in its order, Alismatales, and related groups such as Acorales, Petrosaviales and some members of Dioscoreales. To find entire lineages that have larger flowers, we have to traverse several orders of branches outside the Alismatales to the Liliales. This pattern tells us that small flowers came before the massive inflorescence in the evolution of the corpse plant lineage.
The ancestral presence of those tiny flowers might have determined the evolutionary trajectory of the corpse plant. Todd Barkman of Western Michigan University and his colleagues studied rates of flower-size evolution. They found that lineages whose ancestors had large individual flowers tended to have higher rates of floral-size evolution than lineages descended from small-flowered forms. In other words, larger flowers beget larger flowers. This is what they think occurred in Rafflesia, a genus of carrion-pollinated plants native to Southeast Asia that have the largest individual flowers in the world, each one around the size of a beach ball.
In the corpse plant and its close relatives, however, flowers are small, so rates of size evolution in the individual flowers are also low. In the face of selection pressure from carrion pollinators for larger blossoms, variants with larger overall bloom sizes are more likely to emerge than variants with larger individual flowers.
In 2022 researchers documented a bloom measuring more than 14 feet tall in the rainforest of West Sumatra--one of the largest on record. The species is endangered; fewer than 1,000 individuals are estimated to remain in the wild. Adi Prima/Anadolu Agency/Getty Images
Once a plant starts down the path of developing a bigger inflorescence instead of a larger flower, it undergoes a kind of ratchet effect whereby large inflorescences give rise to ever larger inflorescences, and the alternative evolutionary path of selection acting on individual flower size becomes less and less likely.
The fact that giant inflorescences in plants outside the corpse plant’s family such as sunflowers, figs and palms generally contain lilliputian flowers supports this idea. Corypha umbraculifera, the talipot palm, has an inflorescence up to 26 feet in length—the longest in the world—that may hold as many as 25 million diminutive golden flowers.
What this tells us about evolution is that where selection acts in an organism depends on the history of that particular lineage. Did a plant’s ancestors have small flowers clustered into inflorescences, or did they have a single-flowered stalk? If the former, selection might have favored larger inflorescences, as in Amorphophallus; if the latter, selection might have promoted bigger individual flowers, as in Rafflesia. The corpse plant highlights the importance of these historical contingencies.
The titan arum is obviously spectacular to behold. But there’s more to it than immediately meets the eye—or nose. The next time one blooms near you, I hope you’ll join the crowd of spectators to experience it in all its glory and ponder these evolutionary insights that help us make sense of the weirdest plant in the world.Author: Kate Wong. Jacob S. Suissa. Source
