A flowering plant native to China's mountains has been officially confirmed as carnivorous, proving a prediction made by Charles Darwin more than 150 years ago. Scientists announced the discovery of Saxifraga candelabrum, which uses sticky hairs to trap and digest insects. The findings were published on August 4, 2026, in the journal Nature Communications.This breakthrough confirms Darwin’s long-held suspicion about certain Saxifraga species.[livescience+2]
Darwin's Long-Standing Hypothesis
In 1875, Charles Darwin, the famed British naturalist, published his book Insectivorous Plants. In this work, Darwin studied various insect-eating plants. He observed tiny insects stuck to the leaves and stems of two European Saxifraga species, S. rotundifolia and S. umbrosa. These plants had sticky glandular hairs, which led Darwin to theorize they might be carnivorous.[global+5]
However, the scientific tools available in the 19th century were not advanced enough for Darwin to conclusively prove his hypothesis. To be considered truly carnivorous, a plant must not only trap prey but also digest it and absorb its nutrients. Without proof of digestion and nutrient absorption, a plant is considered only "protocarnivorous," meaning it catches insects but does not necessarily consume them for sustenance. Darwin's experiments did not provide the decisive evidence needed, leaving his question unanswered for nearly 150 years.[livescience+8]
Unraveling the Mystery in China's Mountains
The plant at the center of this new study, Saxifraga candelabrum, grows in the high-altitude Hengduan Mountains of southwest China. This region connects the Tibetan Plateau to the Yunnan-Guizhou Plateau. The plant thrives at elevations between 8,200 and 10,800 feet (2,500 and 3,300 meters), often found in nutrient-poor rocky crevices. These harsh environments make it difficult for plants to get essential nutrients like nitrogen from the soil.[livescience+5]
Researchers from the Kunming Institute of Botany of the Chinese Academy of Sciences and the University of Florida led the study. During fieldwork in Shangri-La, Yunnan province, scientists noticed that the sticky hairs covering the Saxifraga candelabrum were packed with insects. Mature plants averaged 71 trapped insects on their branches. This observation sparked the investigation into whether these plants were truly carnivorous. Study co-author Douglas Soltis, a distinguished professor of biology at the Florida Museum of Natural History, described the feeling of confirming Darwin's prediction as both "humbling and very exciting."[livescience+7]
Scientific Proof of Plant Carnivory
To definitively classify Saxifraga candelabrum as carnivorous, the research team conducted a series of experiments. They needed to show that the plant could attract, capture, digest, and absorb nutrients from its prey.
First, the scientists confirmed the plant's ability to attract insects using floral scents. They found that the sticky hairs on the stems and branches effectively trapped small insects, primarily nonbiting midges. Interestingly, the plant showed a selective palate, rarely catching larger pollinators that are important for its reproduction. This "smart tactic" allows the plant to hunt for food without harming the insects it relies on for pollination.[smithsonianmag+7]
Next, the researchers looked for evidence of digestion. They found phosphatase, a digestive enzyme, right inside the plant's sticky hairs. This enzyme is known to break down animal matter. To confirm nutrient absorption, scientists used fruit flies labeled with a stable form of nitrogen. They fed these labeled flies to the plants and then traced the nitrogen. The results showed a significant rise in labeled nitrogen levels within the Saxifraga candelabrum tissues. This provided direct evidence that the plant absorbs nitrogen from the digested insects to fuel its growth, flowering, and fruit development.[global+9]
Finally, a genetic analysis revealed that Saxifraga candelabrum shares genes with other known carnivorous plants. These genes are linked to processes like prey attraction, digestion, and nutrient absorption. Together, these findings conclusively demonstrated that Saxifraga candelabrum has evolved carnivorous traits to survive in its nutrient-poor alpine environment. The sticky hairs, which may have initially served for herbivore defense, adapted over time into effective insect traps.[thebrighterside+8]
Broader Implications for Plant Science
This discovery is significant for several reasons. It adds Saxifraga and the broader plant order Saxifragales to the known diversity of carnivorous plants. Previously, carnivory was not confirmed in this group of non-woody flowering plants.[thebrighterside+1]
The findings also suggest that plant carnivory may be more widespread than scientists currently recognize. Douglas Soltis told Live Science that he would not be surprised if other Saxifraga family members with sticky hairs are also carnivorous, just as Darwin predicted. Carnivory is an evolutionary adaptation that has evolved independently at least 12 times in different plant lineages across various continents, allowing plants to thrive in nutrient-deficient soils. These habitats often include bogs, swamps, and rocky crevices where essential nutrients like nitrogen and phosphorus are scarce.[global+5]
The Legacy of Darwin
The confirmation of Saxifraga candelabrum's carnivorous nature comes 151 years after Darwin first pondered the possibility. This highlights the enduring power of careful observation in science. Darwin's astute observations in 1875 laid the groundwork, even if he lacked the technology to provide definitive proof. Modern scientific tools and techniques have now enabled researchers to complete the puzzle he started.[cbc+1]
The study underscores how fundamental evolutionary biology principles, first articulated by Darwin, continue to be validated by new discoveries. It also shows the remarkable ways plants adapt to their environments, even developing "murderous" traits to secure survival. The research team noted that having the opportunity to confirm one of Darwin's predictions was a deeply satisfying experience.
The discovery highlights how nature continues to reveal its secrets, often confirming the foresight of past scientific giants.[smithsonianmag]
