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Plants & trees · Habitats

Eucalyptus

The tallest flowering plant on Earth is an Australian tree—now growing taller than any native European tree, on Portuguese soil.

Eucalyptus is a genus of over 700 flowering plant species in Myrtaceae, most native to Australia—with representation in every state and territory—and a few native to islands north of Australia, including E. deglupta in the Philippines. E. regnans is the tallest known flowering plant (angiosperm), with its tallest specimen, Centurion, measuring 100.5 m; the tallest reliably measured tree in Europe is E. diversicolor (72.9 m) in Coimbra, Portugal. E. globulus bark cells photosynthesize without foliage to re-fix internal CO₂ after partial defoliation.

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Chapters & takeaways6
  1. 0:59
    Range

    Over 700 species, almost all native to Australia—with at least one reaching the Philippines.

  2. 2:27
    Northernmost Native

    E. deglupta is the only Eucalyptus native as far north as the Philippines.

  3. 3:58
    Tallest Flowering Plant

    E. regnans is the tallest angiosperm: Centurion stands 100.5 m tall.

  4. 5:02
    Tallest Tree in Europe

    E. diversicolor is the tallest reliably measured tree in Europe—at 72.9 m in Coimbra, Portugal.

  5. 6:14
    Non-Australian Natives

    A few species are native to islands north of Australia; fewer still occur only outside the continent.

  6. 7:23
    Bark Photosynthesis

    E. globulus bark cells photosynthesize without foliage to re-fix internal CO₂ after partial defoliation.

Worth your time?

Yes. See the whole thing.

4.5/ 5
What works
  • bark photosynthesis under defoliation stress
  • structural capacity for extreme height in temperate forests
What does not
  • establish native range beyond Australia, islands north of Australia, and the Philippines
  • occur natively in Europe, North America or Africa
See it if
  • botanists
  • foresters
  • field naturalists tracking height records or bark physiology
Skip it if
  • gardeners seeking low-maintenance ornamentals
  • conservationists focused on endemic island flora
The written brief1 min read

What the species is and where it came from

Eucalyptus is a genus of over 700 flowering plant species in Myrtaceae, most native to Australia—with representation in every state and territory—and a few native to islands north of Australia, including E. deglupta in the Philippines.

How it works, in terms someone would actually use

Eucalyptus species photosynthesize through bark when foliage is lost; one species, E. globulus, re-fixes internal CO₂ via bark cells after partial defoliation.

What it gets right

It gets right the physiological adaptation of bark photosynthesis under stress, and the structural capacity for extreme height in temperate forest ecosystems.

What it does not

It does not establish native range beyond Australia, islands north of Australia, and the Philippines; it does not occur natively in Europe, North America or Africa.

What it changed

It changed how we measure height in angiosperms: E. regnans holds the global record at 100.5 m, and E. diversicolor holds the European record at 72.9 m.

Who it is for, and who it is not

It is for botanists, foresters, and field naturalists who track height records, bark physiology, or non-native tree performance; it is not for gardeners seeking low-maintenance ornamentals or conservationists focused on endemic island flora.

Is it worth your time

Yes—if you want to see the tallest flowering plant on Earth, or a non-native tree taller than any native European tree.

Same habitat · Plants & trees4 of 19
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.
9:31
MangroveMangroves are halophytic shrubs or trees adapted to coastal saline or brackish water in equatorial climates along coastlines and tidal rivers. They use complex salt filtration and specialised root structures — stilt roots and pneumatophores — to survive waterlogged, low-oxygen mud. They thrive only in the upper intertidal zone. They do not grow inland, in freshwater, or outside equatorial coasts.
9:38
Resurrection plantResurrection plants are not one species but a functional group — ferns, lycophytes and flowering plants — that survive near-total dehydration in vegetative tissues and revive fully upon rehydration. They inhabit arid rock outcrops, especially in Southern Africa. Their survival relies on sugar glass formation, LEA proteins and antioxidant activation — all empirically observed. They do not retain this ability in seeds or spores, nor do they function in humid or deep-soil habitats. Their value lies in demonstrating that complete metabolic arrest and recovery is possible outside reproductive structures — a threshold most land plants cannot cross.
9:06
Seed dispersalSeed dispersal is the movement of seeds away from parent plants in spermatophytes. It relies on abiotic (wind, water, gravity) and biotic (birds, mammals, ants) vectors. It occurs individually or collectively, across space and time. Mechanism determines patterns affecting genetics, migration and species interactions. Modes include gravity, ballistic ejection, wind, water and animal-mediated forms — including serotiny. Inferences from morphological traits like wings or fleshy fruit are common but often misleading: plants disperse without classic adaptations, and traits are multifunctional.
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