Kauaʻi record · kba_plant_eucalyptus_crebra

Narrow-leaved Ironbark

Eucalyptus crebra

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About Narrow-leaved Ironbark

Narrow-leaved Ironbark (Eucalyptus crebra) is an introduced tree treated as naturalized on Kauaʻi by Bishop Museum’s 2025 checklist and the 2026 Smithsonian checklist. Current extent is unassessed. An eastern Australian tree of open forest and dry sclerophyll woodland, primarily in seasonally dry tropical to subtropical conditions. Its thick ironbark and narrow crown leaves are characteristic of fire-prone woodland settings. Naturalized on Kauaʻi in the Bishop Museum 2025 checklist (Status=nat; K=K), with Smithsonian 2026 Kauaʻi corroboration; public occurrence is island-level only. This evidence does not quantify current abundance or ecological effects.

Kauaʻi evidence

Taxonomic identity, tree form, diagnostic morphology and island occurrence use the linked reviewed sources. Historical planting, cultivation, naturalization and invasive status are separate. Generated imagery is not occurrence evidence. The 1918–1959 Kauaʻi reforestation working register records 1,492 plants under Eucalyptus crebra across 1 entries dated 1931. These are recorded planting quantities, not counts of surviving trees, and they do not by themselves establish current persistence, naturalization, or ecological impact. Source: Kauaʻi Reforestation Plantings 1918–1959 working register (user-supplied; reconciled 6 October 2026).

Names and classification

Scientific name: Eucalyptus crebra
Common names: Narrow-leaved Ironbark · Narrow-leaved red ironbark
Other names: Eucalyptus crebra · Narrow-leaved ironbark · Narrow-leaved red ironbark
Record type: Species

Kauaʻi occurrence and status

Kauaʻi occurrence: Recorded on Kauaʻi
Origin: Introduced
Conservation status: Not yet assessed
Evidence date: 2026-10-06
Evidence limits: Current island-wide abundance, occupied habitat, reproductive distribution, population trend, and ecological effects on Kauaʻi remain unassessed.

Habitat and ecology

Habitats: Not yet assessed
Food and resource needs: Not yet assessed
Reproduction: Bisexual flowers are borne in bud clusters and develop into woody capsules that release numerous small seeds. Successful recruitment requires flowering, pollination, capsule maturation, seed release, dispersal, and establishment. Kauaʻi-specific phenology and recruitment are unmeasured.
Shelter: Not yet assessed
Growth form: Tree

Threats and conservation

Monitoring: Not yet assessed
Data gaps: Current population extent and trajectory · Additional species-specific ecological and conservation sources

Process and seasonal context

Seasonal timing: Not yet assessed
Seasonal description: Narrow-leaved Ironbark (Eucalyptus crebra) is an introduced tree treated as naturalized on Kauaʻi by Bishop Museum’s 2025 checklist and the 2026 Smithsonian checklist. Current extent is unassessed. An eastern Australian tree of open forest and dry sclerophyll woodland, primarily in seasonally dry tropical to subtropical conditions. Its thick ironbark and narrow crown leaves are characteristic of fire-prone woodland settings. Naturalized on Kauaʻi in the Bishop Museum 2025 checklist (Status=nat; K=K), with Smithsonian 2026 Kauaʻi corroboration; public occurrence is island-level only. This evidence does not quantify current abundance or ecological effects.

Sources and further reading

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