Family: Poaceae

High Risk Traits:

• Elevation range exceeds 1000 m, demonstrating environmental versatility
  
• Thrives in tropical climates
  
• Naturalized in Puerto Rico and South America (no evidence in Hawaiian Islands to date)
  
• Aggressive, weedy grass with potential to outcompete other pasture species (esp. legumes)
  
• Other Urochloa species are invasive
  
• Allelopathic
  
• Photosensitization has been recorded in horses grazing U. humidicola pasture for over 5 months (uncommon)
  
• Shade-tolerant
  
• Tolerates many soil types
  
• Forms a dense cover that excludes other vegetation
  
• Reproduces by seeds and vegetatively by stolons
  
• Several accessions are apomictic
  
• Dispersed and cultivated intentionally by people
  
• Tolerates grazing, defoliation and fire

Low Risk Traits:

• Unarmed (no spines, thorns, or burrs)
  
• Palatable to grazing animals
  
• Aggressive growth suppresses other weedy species
  
• Low seed set may limit ability to disperse
  
• Seeds lose viability quickly
  
• Herbicides provide effective control