Brittle Gum

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 245 plants under Eucalyptus mannifera 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 mannifera

Common names

Brittle Gum

Other names

Eucalyptus mannifera · Brittle Gum

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

Present survival, naturalization, abundance, occupied habitat, population trend and ecological effects on Kauaʻi are unconfirmed.

Habitat and ecology

Habitats

Not yet assessed

Food and resource needs

Not yet assessed

Reproduction

Bisexual white flowers, woody seed capsules; juvenile foliage comparison is supported, no distinct male and female trees. Ledger does not resolve subspecies; nominal narrow-leaf juvenile morphology used without asserting historic subspecies. No Kauaʻi-specific phenology or recruitment inferred.

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

Brittle Gum (Eucalyptus mannifera) is a post-contact introduced tree documented on Kauaʻi through historical forestry planting records. The reviewed records do not establish present survival. Native to southeastern Australian dry open woodland, often shallow rocky soils. Generic cultivated ridge clearing reconstruction. A government forestry ledger compiled in 1980 documents Eucalyptus mannifera planted on Kauaʻi in 1931. Historical planting evidence only; current survival, naturalization, abundance, recruitment, and ecological effects remain unconfirmed. Public occurrence is island-level only.

Sources and further reading

• https://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?constat=&dist=&lvl=sp&name=Eucalyptus~mannifera&page=nswfl&showsyn=
• https://apps.lucidcentral.org/euclid/text/entities/eucalyptus_mannifera_subsp._mannifera.htm
• https://research.fs.usda.gov/download/treesearch/47617.pdf