Family: Cyperaceae

Origin, Description & Uses
Schoenus apogon, commonly known as common bog sedge, fluke bog rush, or smooth bogrush, is a grass-like sedge native to parts of Asia and the Pacific, ranging from Vietnam and Japan through the Ryukyu Islands to eastern and southeastern Australia and New Zealand. It is typically found in wet habitats such as marshes, bogs, seepages, and along the margins of wetlands. This perennial plant forms clumps of slender stems topped with small brownish flower clusters and is valued primarily for its ecological role in wetland environments. In some regions it is used in habitat restoration, erosion control, and naturalistic landscaping where moisture-loving native or wetland species are desired.

Risks & Threats
Schoenus apogon is naturalized in Hawaiʻi and possesses traits that warrant further attention. As a wetland-adapted species capable of reproducing and persisting in moist environments, it has the potential to spread into sensitive habitats where it could compete with native wetland plants for space, light, and resources. Although significant ecological impacts have not been fully documented in Hawaiʻi, its ability to establish self-sustaining populations raises concerns about future spread. Because of these characteristics, ongoing evaluation is needed to better understand its behavior and potential impacts. Caution is recommended when planting or distributing this species to help ensure that it does not negatively affect Hawaiʻi’s unique ecosystems.

High Risk Traits:

• Collected and reported as naturalized on Hawaii island, but limited in distribution
  
• Reported as an invasive weed of rough or poorly drained pasture, but impacts are unspecified
  
• Tolerates many soil types
  
• Reproduces by seeds
  
• Self-compatible
  
• Reaches maturity in one growing season
  
• Seeds dispersed by water and intentionally by people, and possibly accidentally through soil contamination
  
• Seeds form a persistent seed bank
  
• Resprouts after fire

Low Risk Traits:

• Despite naturalization and potential weediness, no negative impacts have been documented
  
• A possible accidental introduction to Hawaii, and unlikely to be intentionally cultivated or dispersed
  
• Unarmed (no spines, thorns, or burrs)
  
• Provides fodder for livestock
  
• Non-toxic
  
• Grows in high light environments
  
• Not reported to spread vegetatively