Family: Myrtaceae

Eucalyptus regnans (mountain ash, swamp gum)  is a species of medium sized to very tall tree native to south-eastern Australia. Eucalyptus regnans is valued for its timber. Outside its native range, it is grown in plantations in New Zealand and Chile, and to a limited extent, in South Africa and Zimbabwe. The pulpwood from Eucalyptus regnans is used in the paper and pulp industry. The long fibers in the wood make it suitable for high-quality paper production. The clear felling of the tree in Australia has a controversial history, with strong opinions for and against harvesting it. This plant has not been documented as naturalized in any Hawaiian Islands to date.

High Risk Traits:

• Naturalized in New Zealand
  
• Other Eucalyptus species are invasive
  
• Allelopathic
  
• Tolerates many soil types
  
• Forms small, pure stands within native range (often after fires)
  
• Reproduces by seeds
  
• Hybridizes with other Eucalyptus species
  
• Capable of selfing (with reduced seed set)
  
• Seeds dispersed by wind and intentionally by people

Low Risk Traits:

• No reports of naturalization in Hawaii, or invasiveness where cultivated
  
• Unarmed (no spines, thorns, or burrs)
  
• May be browsed by animals
  
• Thrives in full sun (dense shade may limit ability to establish and spread)
  
• Not reported to spread vegetatively
  
• Reaches maturity in 15-20 years
  
• Limited seed set
  
• Forms a short-lived seed bank