Triangular Club-rush
Schoenoplectus triqueter
Conservation status data sourced from the IUCN Red List of Threatened Species.
Photo: Wikimedia Commons (CC) via https://en.wikipedia.org/wiki/Schoenoplectus_triqueter
Taxonomy & Classification
Kingdom
Plantae
Phylum
Tracheophyta
Class
Liliopsida
Order
Poales
Family
Cyperaceae
Genus
Schoenoplectus
Triangular Club-rush belongs to the family Cyperaceae, order Poales, within the Liliopsida class.
Species Profile
Species profile data sourced from the IUCN Red List of Threatened Species.
Triangular Club-rush faces severe threats from habitat loss due to coastal development, wetland drainage, and sea-level rise affecting its specialized estuarine environments. The species' restricted distribution and dependence on specific tidal conditions make remaining populations extremely vulnerable to environmental changes and human disturbance.
Key Facts
Habitat & Distribution
Triangular Club-rush occurs in brackish and saltwater marshes, estuarine mudflats, and tidal riverbanks where fresh and salt water mix. The species typically grows in shallow water or saturated soils along coastlines and in lower reaches of rivers subject to tidal influence.
Threats
IUCN Red List: Critically Endangered
Triangular Club-rush faces severe threats from habitat loss due to coastal development, wetland drainage, and sea-level rise affecting its specialized estuarine environments. The species' restricted distribution and dependence on specific tidal conditions make remaining populations extremely vulnerable to environmental changes and human disturbance.
Coastal development and urbanization
Sea-level rise and saltwater intrusion
Wetland drainage and land conversion
Invasive species competition
Water pollution and eutrophication
National vs Global Threat Status
How this species is assessed at the national level compared to its IUCN global status (CR).
| Country | National Status | Global Status | Comparison |
|---|---|---|---|
| EU | LCLeast Concern | CRCritically Endangered | Lower local risk |
| EU | LCLeast Concern | CRCritically Endangered | Lower local risk |
National Red List data sourced from the National Red List Project (nationalredlist.org, ZSL) and country-specific Red List authorities.
Community Sightings
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Sources & Attribution
How to Cite
IUCN: IUCN (2025). The IUCN Red List of Threatened Species. Version 2025-1. Available at: https://www.iucnredlist.org. doi:10.2305/IUCN.UK.2025-1.RLTS
GBIF: GBIF.org (2025). GBIF Home Page. Available at: https://www.gbif.org
National Red Lists: ZSL (2025). National Red List. Zoological Society of London. Available at: https://www.nationalredlist.org
This page: SpeciesRadar (2025). Triangular Club-rush (Schoenoplectus triqueter). SpeciesRadar: Intelligence for Earth's Biodiversity. Available at: https://speciesradar.org/species/triangular-club-rush