Family: Asteraceae

High Risk Traits:

• Thrives in tropical climates
  
• Elevation range exceeds 1000 m
  
• Widely naturalized, including on the Hawaiian Islands of Molokai, Lanai, Maui, Kahoolawe and Hawaii
  
• Disturbance weed
  
• A potential environmental weed in South Africa (may impact an endangered plant species)
  
• Possible skin allergen
  
• Tolerates many soil types
  
• Forms dense cover that may impact rare plants (South Africa)
  
• Produces wind-dispersed seeds
  
• Self-compatible
  
• Annual (reaches maturity in <1 year)
  
• Adapted to and dispersed along heavily disturbed corridors

Low Risk Traits:

• Unarmed (lacks spines, thorns, or burrs)
  
• Non-toxic
  
• Ornamental
  
• Requires full sun
  
• Does not spread vegetatively
  
• Seedlings do not tolerate root disturbance