Kauaʻi record · kba_plant_casuarina_equisetifolia
Ironwood
Casuarina equisetifolia
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About Ironwood
Casuarina equisetifolia is native to Australia and neighboring Indo-Pacific coasts and is introduced and naturalized in Hawaiʻi. It tolerates salt, wind, nutrient-poor sand, and coastal exposure, while dense litter, shade, and root competition can suppress strand vegetation. Kauaʻi botanical records document it in coastal and dry-mesic settings, but management should be site-specific because old plantings also provide windbreak and structural functions. Bishop Museum’s 2025 checklist documents naturalized presence on Kauaʻi; current extent remains unassessed.
Kauaʻi evidence
Bishop Museum 2025 Checklist wide: Taxon=Casuarina equisetifolia; Status=nat; K=K. Identification and ecological statements have the separately linked reviewed sources. The checklist establishes documented island presence; it does not establish current abundance or invasion extent. The 1918–1959 Kauaʻi reforestation working register records 37,764 plants under Casuarina equisetifolia across 15 entries dated 1928–1958. 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
- Casuarina equisetifolia
- Common names
- Ironwood
- Other names
- Ironwood · Australian pine · horsetail tree · beefwood · Casuarina equisetifolia
- Record type
- Species or taxonomic group
Kauaʻi occurrence and status
- Kauaʻi occurrence
- Recorded on Kauaʻi
- Origin
- Introduced
- Conservation status
- Conservation priority; formal rank not listed
- Evidence date
- 2026-10-05
- Evidence limits
- Current extent and population trajectory require refreshed surveys; public occurrence is island level only.
Habitat and ecology
- Habitats
- Coastal strand · Beaches · Disturbed coasts
- Food and resource needs
- Light, water, nutrients, and suitable soil or substrate
- Reproduction
- Viable propagules and suitable establishment conditions
- Shelter
- Suitable soil, substrate, and vegetation structure
- Growth form
- Tree
Threats and conservation
- Threats
- Coastal habitat alteration where invasive
- Conservation actions
- Site-specific coastal management
- Monitoring
- Site-specific coastal management
- Data gaps
- Additional ecological and conservation citations are recommended
Process and seasonal context
- Seasonal timing
- Not assessed
- Seasonal description
- Casuarina equisetifolia is native to Australia and neighboring Indo-Pacific coasts and is introduced and naturalized in Hawaiʻi. It tolerates salt, wind, nutrient-poor sand, and coastal exposure, while dense litter, shade, and root competition can suppress strand vegetation. Kauaʻi botanical records document it in coastal and dry-mesic settings, but management should be site-specific because old plantings also provide windbreak and structural functions. Bishop Museum’s 2025 checklist documents naturalized presence on Kauaʻi; current extent remains unassessed.
Sources and further reading
- https://commons.wikimedia.org/wiki/File:Casuarina_equisetifolia_257711520.jpg
- https://research.fs.usda.gov/silvics/casuarina
- https://www.srs.fs.usda.gov/pubs/misc/ag_654/volume_2/casuarina/casaurina.htm
- https://ntbg.org/database/herbarium/detail/PTBG1000077724
- https://ntbg.org/database/herbarium/detail/PTBG1000013296
- https://hbs.bishopmuseum.org/publications/pdf/tr75.pdf
