Family: Rutaceae

Origin, Description & Uses
Citrus japonica, commonly known as the meiwa kumquat, is a small, evergreen citrus tree native to China. It produces round, bright orange fruits that are sweet and tangy, often eaten whole, including the peel. The tree is compact, making it ideal for home gardens, containers, and ornamental plantings. Its attractive foliage, fragrant flowers, and edible fruit make it a popular choice for both culinary and decorative purposes.

Risks & Threats
Meiwa kumquat is considered a low-risk species in Hawaii. It is not known to spread aggressively or disrupt native ecosystems. While it may attract typical garden pests or diseases common to citrus, it poses minimal ecological threat and is generally safe to plant in managed landscapes.

High Risk Traits:

• Thorniness: Can produce spines or thorns.
  
• Introduction History: Repeatedly introduced outside native range.
  
• Pest Host: Host for the Asian citrus psyllid (Diaphorina citri).
  
• Hybridization: Hybridizes readily with other citrus species.

Low Risk Traits:

• Not a Weed: No evidence of weedy or invasive behavior.
  
• Non-Toxic: Edible fruit; not toxic to animals or humans.
  
• Low Seed Production: Fruits contain few or no seeds.
  
• Low Dispersal: Propagules lack adaptations for wind, water, or external dispersal.
  
• Slow-Growing: Limited ability to spread rapidly.
  
• Narrow Climate Suitability: Restricted to USDA Zones 8-11.