Family: Proteaceae

Origin, Description & Uses
Stenocarpus sinuatus (commonly known as the Queensland firewheel tree) is native to southeastern New Guinea and eastern Australia, where it grows in warm, humid rainforest environments. It is a striking evergreen tree best known for its spectacular, wheel-shaped clusters of bright red to orange tubular flowers that appear along the branches, giving the appearance of glowing “firewheels.” In cultivation, it is widely planted as an ornamental shade tree in tropical and subtropical landscapes, valued for its showy flowers, glossy foliage, and ability to attract birds and pollinators.

Risks & Threats
This species is potentially naturalized on Hawaiʻi Island, though it is currently considered low risk in the Hawaiian Islands due to its limited spread and generally non-aggressive behavior in managed landscapes. While it can produce seeds and establish in suitable conditions, it has not shown strong invasive tendencies in most Hawaiian environments to date. However, any naturalizing non-native species should be monitored over time, as changing conditions or ecological interactions could alter its behavior. Continued observation is recommended to ensure it does not expand beyond planted areas and begin to impact native plant communities.

High Risk Traits:

• Broad climate suitability (temperate to subtropical)
  
• Thrives in tropical climates
  
• Naturalizing on island of Hawaii (Hawaiian Islands); may be naturalized outside native range in Australia and an escape, and possibly naturalized, in New Zealand
  
• Tolerates many soil types
  
• Reproduces by seeds, and vegetatively over short distances by suckers
  
• Seeds dispersed by wind and intentionally by people
  
• Coppices and suckers following cutting and fire

Low Risk Traits:

• No reports of invasiveness or negative impacts outside native range
  
• Unarmed (no spines, thorns, or burrs)
  
• Palatable to browsing animals
  
• Non-toxic
  
• Floral morphology prevents self-pollination
  
• Flowers adapted for bird-pollination; seed set may be reduced where effective pollinators are limited or absent
  
• Reaches maturity slowly (7-15 years to flower if grown from seed)