Use the IUCN Red List first for risk, then use Kew Gardens to confirm the tree’s name. That is the fastest way to research threatened and extinct trees without going in circles. About one in three tree species is threatened with extinction, so the problem is not small [source: BGCI].
TLDR: The IUCN Red List tells you how close a tree is to extinction. Kew Gardens, especially Plants of the World Online, helps you check the accepted scientific name, synonyms, family, and range. For example, if a student researches Franklinia alatamaha, IUCN helps explain its risk status, while Kew helps confirm the plant name and relatives. A simple research workflow can cut search time by about 50%: search Kew for the correct name, then check IUCN for the threat rating.
Two tools. Two jobs.
Think of these two sites as different team members.
- IUCN Red List: The serious ranger with a clipboard.
- Kew Gardens: The plant nerd with a giant name tag machine.
IUCN answers this question:
“How much trouble is this tree in?”
Kew answers this one:
“What exactly is this tree, and what name should I use?”
Both are useful. Neither does everything. Honestly, it feels like the two sites speak different dialects sometimes. One talks in extinction risk. The other talks in taxonomy. That can be annoying. But once you know the split, research gets much easier.
What the IUCN Red List is best at
The IUCN Red List is the global scorecard for extinction risk. It sorts species into categories. These are the famous ones:
- LC: Least Concern
- NT: Near Threatened
- VU: Vulnerable
- EN: Endangered
- CR: Critically Endangered
- EW: Extinct in the Wild
- EX: Extinct
- DD: Data Deficient
That last one, Data Deficient, is a small headache in disguise. It does not mean safe. It means scientists do not have enough data yet.
IUCN pages often include population trends, threats, range maps, and conservation actions. You may see causes like logging, farming, fire, pests, mining, or climate stress. This is gold for school projects, policy work, grant writing, and conservation planning.
For example, a tree may be listed as Critically Endangered because it grows only on one island. Or one mountain. Or in one tiny forest patch that is being cleared. That is the kind of story IUCN is built to tell.
Where IUCN gets frustrating
IUCN is not perfect for names. Expect to waste time if you search only the common name. “Ironwood,” for example, can mean many different trees. That is chaos with bark.
Scientific names can also change. A tree may have an older name in one paper and a newer accepted name in another database. IUCN may still show a name that does not match the name used by Kew. This is not a disaster. It is normal botany. Still, it can make one search feel like five.
Use IUCN when you need:
- Threat status
- Extinction category
- Threat causes
- Population trend
- Conservation actions
What Kew Gardens is best at
Kew Gardens is one of the world’s top plant science hubs. Its online tools are very useful for trees. The big one is Plants of the World Online, often called POWO.
Kew is brilliant for plant identity. It helps you check:
- Accepted scientific names
- Synonyms
- Plant families
- Native ranges
- Basic descriptions
- Links to plant records
This matters a lot. Tree names change. A lot. One species can have several old names. Kew helps you avoid citing the wrong one. It can also help you spot when two “different” trees in your notes are actually the same species.
That is not glamorous. But it saves your project from becoming a soggy mess.
Kew’s POWO says it aims to make information available for the world’s seed plants [source: Kew]. That makes it a strong starting point when you are checking tree names.
Where Kew gets frustrating
Kew is not always the best place to start if your main question is extinction risk. Some pages show conservation status. Some do not. Some have lots of detail. Others feel thin.
This is where people get tripped up. They find a tree on Kew and think, “Great, I am done.” Not quite.
Kew may tell you the plant name is accepted. It may show where the tree is native. But it may not give you the full risk story. For that, go back to IUCN.
Use Kew when you need:
- The correct scientific name
- Old names and synonyms
- Taxonomic family
- Native distribution
- Plant identity checks
A simple research workflow
Here is the least painful way to research a threatened or extinct tree.
- Start with Kew. Search the scientific name.
- Check the accepted name. Copy it exactly.
- Note synonyms. These may appear in old reports.
- Go to IUCN. Search the accepted name and synonyms.
- Record the Red List category. Include the assessment year.
- Compare the range. Check if Kew and IUCN broadly agree.
- Read the threats. Do not stop at the category label.
This method is boring. That is why it works.
Example: extinct and almost extinct trees
Let’s use a few famous trees.
Saint Helena olive was a small tree from Saint Helena. It is widely treated as extinct. If you research it, the name story matters. You may see Nesiota elliptica. Kew helps with the plant identity. IUCN helps with the extinction status and notes.
Franklinia alatamaha is another great case. It is extinct in the wild, but it survives in cultivation. Gardeners love it. Conservation people worry about it. For school work, this is a fun example because the tree is “gone” from nature but not gone from the planet.
Wollemi pine is often called a living fossil. It is not extinct, but it is highly protected and rare in the wild. Kew helps with identity. IUCN helps explain risk.
Head to head: IUCN vs Kew
| Research need | Best tool | Why |
|---|---|---|
| Threat level | IUCN | It gives categories like Endangered and Extinct. |
| Correct name | Kew | It tracks accepted names and synonyms. |
| Cause of decline | IUCN | It lists threats and pressures. |
| Plant family | Kew | It is strong on taxonomy. |
| Conservation plan | IUCN | It often lists needed actions. |
Best choice for different users
Students: Use both. Kew for the name. IUCN for the status. Your teacher will thank you.
Gardeners: Start with Kew. You need the right plant name before buying, planting, or writing a label.
Conservation workers: Start with IUCN. You need threat data first. Then use Kew to clean up names in reports.
Writers and journalists: Do not trust common names alone. Check Kew, then IUCN. This avoids embarrassing mix-ups.
The best answer
IUCN and Kew are not rivals. They are a pair of boots. Wear both or you will limp.
Use Kew Gardens to confirm what tree you are talking about. Use the IUCN Red List to explain how close that tree is to extinction. If the two tools seem to disagree, check the synonyms, dates, and assessment notes.
Threatened trees are not just sad trivia. They hold food, shade, medicine, carbon, culture, and homes for wildlife. Losing them is not like losing a file. It is more like ripping pages out of Earth’s instruction manual.
So keep it simple. Name first. Risk second. Story third. That is the clean way to research extinct and threatened trees.