Family: Hydrocharitaceae

High Risk Traits:

• Grows in temperate to subtropical climates
  
• Naturalized outside native range
  
• Weedy smothering growth, with possible negative impacts on agriculture or the natural environment
  
• Limnobium laevigatum also reported to be invasive
  
• Tolerates shade
  
• Forms dense, smothering mats in fresh water bodies
  
• Reproduces by seeds and vegetatively
  
• May be dispersed by external attachment to boats or other water craft
  
• Sold in aquarium trade
  
• Seeds dispersed by waterfowl and possibly other animals

Low Risk Traits:

• Unarmed (no spines, thorns or burrs)
  
• Non-toxic
  
• Ornamental
  
• Several herbicides provide effective control
  
• May be controlled mechanically