Family: Fabaceae

Origin, Description & Uses
Mucuna bracteata is a fast-growing tropical vine native to the Eastern Himalaya, southern China (including Guangdong and Yunnan), and Sumatra. It is a vigorous legume known for its ability to spread across the ground and climb over vegetation. In agriculture, it is widely used as a cover crop—especially in rubber and oil palm plantations—because it helps suppress weeds, reduce soil erosion, and improve soil fertility by fixing nitrogen.

Risks & Threats
Although Mucuna bracteata is not known to be naturalized in Hawaiʻi, it does possess traits that are cause for concern. Its rapid growth, dense smothering habit, and ability to spread aggressively in warm tropical environments raise the possibility that it could outcompete and overwhelm low-growing vegetation. As with other vigorous cover crops, there is also potential for unintended spread beyond intended plantings. Ongoing evaluation is needed to determine whether it could negatively impact Hawaiʻi, and caution is recommended when considering its use.

High Risk Traits:

• Broad climate suitability (elevation range 150–2000 m)
  
• Grows in disturbed/degraded habitats
  
• Can outcompete crops & smother young trees/palms
  
• Congeneric weed (M. pruriens)
  
• Possible allelopathic properties
  
• Unpalatable to grazing animals
  
• Pod trichomes cause skin irritation
  
• Shade tolerant
  
• Climbing & smothering growth habit
  
• Nitrogen-fixing (can thrive in low-N soils)
  
• Produces viable seed
  
• Reproduces vegetatively by cuttings
  
• Seeds form persistent seed bank (>1 yr)
  
• Tolerates mutilation, cultivation, or fire
  
• Spread intentionally by people as cover crop

Low Risk Traits:

• No spines or thorns
  
• No evidence of toxicity to animals
  
• No evidence of wind, bird, or external animal dispersal
  
• No evidence of prolific seed production (>1000/m²)
  
• Well controlled by herbicides