Family: Poaceae

Origin, Description & Uses
Cenchrus petiolaris (petioled fountaingrass) is a tufted ornamental grass native to northeastern tropical Africa. It is valued for its attractive fountain-like growth habit, narrow arching leaves, and soft, bristly flower heads that add texture and movement to landscapes. This species is sometimes planted in dry gardens, ornamental borders, and low-water landscaping because of its drought tolerance and adaptability to warm climates. Like other fountain grasses, it is appreciated for its ability to thrive in sunny conditions with relatively little maintenance.

Risks & Threats
Although Cenchrus petiolaris is not currently known to be naturalized in the Hawaiian Islands, it possesses traits that are cause for concern and could detrimentally impact tropical island ecosystems. Species in this group are often capable of producing abundant seed, spreading into disturbed areas, and forming dense stands that can outcompete native vegetation. In dry and fire-prone habitats, invasive grasses may also increase wildfire risk by creating continuous fine fuels. Because Hawaiʻi’s ecosystems are especially vulnerable to invasive plants, caution is advised when considering the use of this species. Choosing a low risk or native alternative is recommended whenever suitable options are available.

High Risk Traits:

• Congeneric weeds invasive
  
• Self-compatible
  
• Annual (generative time ≤1 year)
  
• Dispersed unintentionally (roadsides, disturbed areas)
  
• Dispersed intentionally (ornamental)
  
• Seed contaminant (bird seed)
  
• Wind-dispersed propagules

Low Risk Traits:

• Not naturalized
  
• No evidence of weediness (garden, ag, environmental)
  
• No spines, thorns, or burrs
  
• Palatable to grazing animals
  
• Not toxic to animals