Family: Salicaceae

High Risk Traits:

• Broad climate suitability, and elevation range exceeds 1000 m, demonstrating environmental versatility
  
• Possibly naturalized (confirmation needed)
  
• Disturbance-adapted aggressive tree
  
• Invades and controlled in conifer forests
  
• Other Populus species have become invasive
  
• Tolerates many soil types
  
• Forms dense stands within native range
  
• Reproduces sexually (seeds) and asexually (vegetative)
  
• Hybridizes with other Populus species
  
• Reproduces by root suckers and stump sprouts
  
• Able to reproduce by suckers at 1 year and by seed at 2-3 years
  
• Seeds dispersed by wind, water and intentionally by people
  
• Prolific seed production (on a 4-5-year cycle)
  
• Able to resprout after repeated cutting

Low Risk Traits:

• A temperate species which may only be able to grow at higher elevation regions of tropical and subtropical islands
  
• Unarmed (no spines, thorns or burrs)
  
• Provides fodder for livestock
  
• Non-toxic to animals
  
• Ornamental
  
• Shade-intolerant
  
• Dioecious
  
• Seeds rapidly lose viability
  
• Herbicides may provide effective control