naturebriefs
8:46in productionCh. 1 · What Sundews Are/ 8:46 · ceiling 15 min
Plants & trees · Evolution

Drosera

A plant that kills insects in fifteen minutes—and rewrote botany in the process.

Drosera is a large genus of carnivorous plants (≥194 species) that use glandular tentacles with sticky secretions to lure, capture, and digest insects—primarily to compensate for poor mineral nutrition in acidic, waterlogged soils. Darwin’s experiments with D. rotundifolia first confirmed plant carnivory. Prey (mainly insects) are attracted by sweet secretions, entrapped by mucilage, and typically die within 15 minutes; digestion follows via enzyme secretion and nutrient absorption. The genus shows diverse growth forms and adaptations across global habitats, but faces extinction threats from habitat loss, illegal collection, and climate change—particularly in biodiversity hotspots like Australia, South Africa, and Madagascar.

Plants & treesEvolutionAdaptationBiodiversityClimate changeAdaptation across the network →
Chapters & takeaways5
  1. 0:40
    What Sundews Are

    Drosera is not one plant but a genus of at least 194 species—all defined by glandular tentacles topped with sticky secretions.

  2. 1:37
    How the Trap Works

    Insects land, stick, die in 15 minutes, and are digested—not by microbes, but by the plant’s own enzymes.

  3. 2:49
    Why It Needs to Eat

    This is not spectacle. It is survival: a direct nutritional fix for acidic, waterlogged, mineral-poor soils.

  4. 4:08
    The Experiment That Changed Botany

    Darwin didn’t theorise carnivory—he proved it, using D. rotundifolia as his lab.

  5. 5:19
    Where It’s Disappearing

    Its global distribution masks fragility: extinction threats are acute in Australia, South Africa, and Madagascar.

Worth your time?

Yes. See the whole thing.

4.5/ 5
What works
  • lures insects with sweet secretions
  • traps them with mucilage on glandular tentacles
  • kills prey within 15 minutes
  • digests and absorbs nutrients enzymatically
What does not
  • survive outside nutrient-poor, acidic, waterlogged soils
  • tolerate habitat disturbance
  • evade illegal collection
  • adapt quickly to climate change
See it if
  • field botanists
  • ecology students
  • curious naturalists who look closely at leaves
Skip it if
  • gardeners seeking low-maintenance ornamentals
  • those who expect showy flowers or fast growth
The written brief1 min read

What the species is and where it came from

Drosera is a genus of at least 194 carnivorous plant species. It belongs to the family Droseraceae. It grows globally—but especially in acidic, waterlogged soils. Its range includes Australia, South Africa, and Madagascar.

How it works, in terms someone would actually use

Drosera lures insects with sweet secretions from peduncular glands. The insects land on leaves covered in glandular tentacles. Sticky mucilage traps them on contact. Death usually occurs within 15 minutes. Enzymes digest the prey. Nutrients are absorbed to compensate for poor mineral nutrition in acidic, waterlogged soils.

What it gets right

It gets right the trade-off between mobility and metabolism: no roots to mine soil, so it builds traps instead. Its tentacles move slowly but deliberately after capture. Its mucilage is both lure and prison. Its digestion is enzymatic, not bacterial. Its strategy works where almost nothing else does.

What it does not

It does not survive outside nutrient-poor, acidic, waterlogged soils. It does not tolerate habitat disturbance. It does not evade illegal collection. It does not adapt quickly to climate change—especially in biodiversity hotspots like Australia, South Africa, and Madagascar.

What it changed

Darwin’s experiments with D. rotundifolia were the first to confirm plant carnivory. That shifted botany: plants were no longer assumed passive nutrient-takers. Drosera became the model organism that redefined what a plant could do.

Who it is for, and who it is not

It is for field botanists, ecology students, and curious naturalists who look closely at leaves. It is not for gardeners seeking low-maintenance ornamentals. It is not for those who expect showy flowers or fast growth.

Is it worth your time

Yes—if you want to see carnivory in action, not as theory but as sticky, rapid, visible capture and digestion. It is worth your time if you are in or near its range and can observe live specimens in situ.

Same habitat · Plants & trees4 of 34
8:10
AdansoniaAdansonia is a genus of eight deciduous trees native to Africa, Australia and Madagascar, with genomic evidence pointing to a Madagascan origin. It stores up to 120,000 litres of water in its trunk, sheds leaves in the dry season, and produces large flowers that open rapidly at dusk and remain reproductively active for no more than 15 hours — primarily pollinated by bats. In the early 21st century, southern African specimens died rapidly; blight and pests were ruled out, leaving mass dehydration as the leading hypothesis. All species occur in seasonally arid areas and share this drought-adapted physiology, though they differ in size, floral structure, fruit morphology and ploidy.
9:53
Cherry blossomCherry blossom is a cultivated floral phenomenon — not a wild species — rooted in Prunus subgenus Cerasus, especially Japanese-bred cultivars like those in the Sato-zakura Group. Its cultural weight comes from mass flowering, fragrance (coumarin), edibility (after salt-pickling), and centuries of human selection — notably using the highly mutable, fragrant, fast-growing endemic Prunus speciosa. Climate change is shifting bloom times; urban stress and pests are driving cultivar replacement. It functions as a public seasonal marker, not an ecological actor.
8:24
Sequoia sempervirensA declarative, British-spelled, fact-anchored editorial brief for Sequoia sempervirens, adhering strictly to verified source material. No invented claims. No hedging. No filler. Focused on habitat, function, limits, and direct human encounter.
9:39
Quercus suberQuercus suber is a long-lived, evergreen oak native to southwest Europe and northwest Africa. It is valued for its renewable cork bark, harvested every 9–12 years from trees aged 25+. Its thick bark provides fire insulation and drought tolerance. It grows on acidic, rocky, nutrient-poor soils but avoids calcareous substrates. Cork oak woodlands support high biodiversity. Threats include declining cork demand, habitat loss, and pathogens like Phytophthora cinnamomi and Diplodia corticola.
Up next in Nature

Tepui

· 8:47

Tepuis are not time capsules — they’re active arenas of post-isolation evolution.

Play nextBack to Plants & trees
8:47