Family: Fabaceae

Origin, Description & Uses
Vachellia campeachiana (formerly Acacia cochliacantha) is a thorny shrub or small tree native to Mexico, Honduras, and Cuba. It typically grows 5–30 feet tall and is easily recognized by its stiff branches and long, sharp spines. This hardy species thrives in dry forests, scrublands, and disturbed habitats such as pastures and abandoned fields. As a nitrogen-fixing legume, it helps improve soil fertility and is also being studied for its ability to absorb heavy metals from contaminated soils. People have traditionally used the roasted seeds as a flour, the branches for making violin bows, and various plant parts in traditional medicine to treat stomach and bladder ailments.

Risks & Threats
Although Vachellia campeachiana is not currently known to be naturalized in the Hawaiian Islands, it possesses several traits that are cause for concern. It grows rapidly, tolerates a wide range of environmental conditions, and can form dense, nearly impenetrable thorny thickets that outcompete native vegetation and hinder access for people and wildlife. These characteristics have allowed it to become invasive outside its native range. Ongoing evaluation is needed to determine whether it could become invasive in Hawaiʻi, and careful consideration should be given before introducing or planting this species in tropical island environments.

High Risk Traits:

• Native to tropical dry forests and disturbed areas; may thrive in similar habitats in Hawaiʻi
  
• Widely naturalized outside its native range
  
• Forms dense, thorny thickets that can exclude other vegetation
  
• Fast-growing and tolerant of disturbance
  
• Spiny branches make it difficult to manage or remove
  
• Nitrogen-fixing ability can alter soil chemistry and ecosystem dynamics
  
• Seeds are edible and durable, with potential for human-assisted spread

Low Risk Traits:

• Not widely used as an ornamental in Hawaiʻi
  
• No evidence of shade tolerance, less likely to invade intact forests
  
• Reproduction mainly by seed; no evidence of vegetative spread