The Mountain Plant That Eats Insects and Vindicates Darwin

In 1875, Charles Darwin published Insectivorous Plants — a book dedicated entirely to plants that eat animals. Buried within its pages was a bold hypothesis: that certain species of Saxifraga, a genus of small flowering plants common in rocky alpine environments, might also be capable of carnivory. 

Darwin was fascinated by their sticky glandular hairs, which he observed trapping insects with ease. He attempted to test the idea himself, but the technology of his era could not deliver a conclusive answer. The question was left open for 150 years.

Now, a landmark 2026 study published in Nature Communications has finally closed that chapter — and Darwin was right.

A Plant That Hunts in the Highlands

Saxifraga candelabrum is a monocarpic perennial herb native to the alpine regions of the Qinghai–Tibet Plateau and the Hengduan Mountains in southwest China, growing at elevations between 2,500 and 3,300 meters. 

It forms a basal rosette and sends up flowering stems covered in small, sticky glandular hairs — the very feature that caught Darwin's attention in related species more than a century ago.

A research team led by Hang Sun of the Kunming Institute of Botany (Chinese Academy of Sciences) and Douglas Soltis of the Florida Museum of Natural History set out to determine whether those hairs do more than just trap insects.

Field surveys and herbarium specimen reviews revealed that 43 out of 45 sampled plants had insects caught in their hairs. Mature specimens averaged 71 trapped insects each — predominantly nonbiting midges. The plant secretes a viscous substance that coats the hairs, acting as a flypaper-style trap.

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The Science of Digestion

To confirm digestion, the researchers used fluorescence tagging to detect phosphatase activity directly in the plant's secretions. The enzyme was present.

For nutrient absorption, the team fed the plant fruit flies (Drosophila) labeled with a stable isotope of nitrogen (¹⁵N). Levels of that labeled nitrogen rose measurably in S. candelabrum tissues.

Finally, a genomic analysis revealed that S. candelabrum shares genes with other independently evolved carnivorous plants — genes linked to prey attraction, digestion, and nutrient uptake. This points to convergent evolution: nature arriving at the same solution through separate evolutionary paths, at least six times across the flowering plant family tree.

Broader Implications: Carnivory May Be Far More Widespread

Unlike most known carnivorous plants like Venus flytraps, Small Sundew, Green Pitcher Plant — which typically grow in waterlogged bogs and wetlands, S. candelabrum thrives in dry, rocky, seasonally arid conditions.

The findings add Saxifraga and, with it, the order Saxifragales to the known roster of carnivorous plant lineages. They also open the door to a significant reclassification effort: how many other plant species, currently dismissed as merely "protocarnivorous" (able to trap but not digest insects), might be full carnivores that haven't been tested with modern methods?

Darwin Vindicated

"Although untested at the time, Darwin's hypothesis provided an important inspiration for our study," said lead researcher Hang Sun.

The confirmation of S. candelabrum's carnivory is more than a historical footnote. It is a demonstration of how scientific hypotheses can be revisited and validated with the right tools. Darwin lacked isotope labeling, fluorescence microscopy, and genomic sequencing. The researchers of 2026 did not.

The study was published in Nature Communications on August 4, 2026, and was highlighted in Nature Plants the same month.