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In Australian usage, “gum tree” is a common name often applied to eucalypts—not the name of a single botanical genus. The familiar eucalypt group includes three distinct genera: Eucalyptus, Corymbia and Angophora. So, while many gum trees are eucalypts in the broader sense, not all belong to the genus Eucalyptus.
What does “gum tree” mean?
“Gum tree” is a common-name label, not a formal botanical rank. In Australia it is commonly used for eucalypts, a related group of trees in the myrtle family, Myrtaceae. Common names vary by place and context, so the label alone does not identify a tree’s genus.
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The Australian National Botanic Gardens notes that many eucalypts are colloquially called gum trees in its 2021 Eucalypt Discovery Walk guide. In this grouping, the three genera are Eucalyptus, Corymbia and Angophora.
Three gum trees from three genera
- Eucalyptus: Many familiar Australian gum trees are species of this genus.
- Corymbia: Range Bloodwood, Corymbia abergiana, is a named example. The Australian Botanic Gardens profile places it in the coastal ranges of northern Queensland; see its August 2024 plant profile.
- Angophora: Smooth-barked Apple, Angophora costata, is a large, spreading tree native to eastern Australia. It belongs to Angophora, not Eucalyptus, according to the Australian National Botanic Gardens’ Growing Native Plants profile.
These examples show why “gum tree” and “eucalyptus” are not interchangeable at the genus level: a tree may be grouped with eucalypts and called a gum tree while belonging to Corymbia or Angophora.
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How can you tell the genera apart?
Leaf arrangement, the covering over a flower bud and the shape of the fruit can help distinguish these genera. They are introductory clues, not a complete identification key; use several features together and consider the tree’s region.
| Genus | Mature leaf arrangement | Bud cap (operculum) | Fruit clue |
|---|---|---|---|
| Eucalyptus | Generally alternate | Present | Varies; use alongside other features |
| Corymbia | Generally alternate | Present | Usually thick-walled and more or less urn-shaped; fruit varies within the group |
| Angophora | Opposite | Absent | Ribbed |
The Australian National Botanic Gardens’ eucalypt guide describes these as group-level distinctions. A leaf by itself may mislead: leaf form can change as a plant matures. Bark is also diverse across the group, so it should not be the sole basis for assigning a genus.
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Why do published species counts differ?
Species totals depend on the taxonomic treatment and its publication date. The Australian National Botanic Gardens’ 2021 flyer gives approximate counts of 735 Eucalyptus, 96 Corymbia and 10 Angophora species. By comparison, the Australian Government’s Flora of Australia Volume 19 treatment, published in 1988, recognizes 513 Eucalyptus species and 7 Angophora species. These figures come from different contexts and should not be combined into one current total. See the Gardens’ 2021 guide and the government’s Flora of Australia Volume 19 page.
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For a tree you encounter outdoors, use a regional flora, field guide or local botanical garden resource. Check mature leaves, buds and fruit when available, and use the location as context; no single common name or visible feature reliably settles every identification.
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