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The Western Australian Herbarium’s collections management system and census were set to read-only mode on 1 October 2025. Taxonomic updates published since this time are not being reflected in Florabase, herbarium collections, or Western Australia’s taxonomic names census (Nomos). Conservation listings displayed on Florabase may also be out of date. Please refer to DBCA’s Threatened species and communities webpage for the most recent Threatened and Priority Flora List, noting that recent taxonomic updates are similarly not included. Our database migration is moving to a staging phase. We thank you for your patience as we ensure the integrity of our biodiversity data, develop new workflows, and train staff to use the new systems. Please reach out to us if you have any questions or concerns.

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Carex divisa Huds.
Divided Sedge

Reference
Fl.Angl. 348 (1762)
Conservation Code
Not threatened
Naturalised Status
Alien to Western Australia
Name Status
Current

Monoecious, rhizomatous, tufted, colonial perennial, grass-like or herb (sedge), 1 m high. Fl. brown/green, Sep to Dec. Sandy clay, black peaty sand. Swamps.

Grazyna Paczkowska, Descriptive Catalogue, 31 October 1993

Distribution

IBRA Regions
Jarrah Forest, Swan Coastal Plain.
IBRA Subregions
Perth, Southern Jarrah Forest.
Local Government Areas (LGAs)
Bridgetown-Greenbushes, Bunbury, Busselton, Canning, Gosnells, Joondalup, Manjimup, Perth, Stirling, Wanneroo.

Management Notes (for the Swan NRM Region)

General Biology. Growth form. Sedge. Life form. Perennial. Reproduction. Rhizomes and seed. Dispersal. Water, soil movement, possibly animals. Fire response. Possibly tolerant to fire due to thick rhizomes.

Notes. Widely naturalised in temperate regions. Possesses thick, woody rhizomes. Likely to be tolerant of frost, salt and water logging. Salinity inhibits germination of seed.

Additional information. Origin. Northern Africa, Europe, temperate and tropical Asia. History of use/introduction. Stream bank stabilisation.

Suggested method of management and control. Physically control only in small or isolated populations. Try 1% glyphosate. Read the manufacturers' labels and material safety data sheets before using herbicides. For further information consult the Australian Pesticides and Veterinary Medicines Authority to determine the status of permits for your situation or state.

Management Calendar

Calendar Type Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Comments
Active Growth             Y Y Y Y      
Germination             U U U        
Flowering                 Y Y Y Y  
Fruiting U                   U U  
Manual Removal Y Y Y Y Y Y Y Y Y Y Y Y  
Herbicide Treatment               Y Y Y      

Legend: Y = Yes, regularly, O = Occasionally, U = Uncertain, referred by others but not confirmed.

 

References

  • Brown, K. & Brooks, K. (2002) Bushland Weeds: A Practical Guide to their Management. Environmental Weeds Action Network, Greenwood.
  • Department of Primary Industries (2009) Invasiveness Assessment - Divided Sedge (Carex divisa) in Victoria. State of Victoria URL: http://www.land.vic.gov.au/dpi/vro/vrosite.nsf/pages/invasive_divided_sedge - Accessed February 2010.
  • Esmaeili, M.M., Bonis, A., Bouzille, J.B., Mony, C. & Benot, M.L. (2009) Consequence of ramet defoliation on plant clonal propagation and biomass allocation: Example of five rhizomatous grassland species. Flora, 204: 25-33.
  • Esmaeili, M.M., Sattarian, A., Bonis, A. & Bouzille, J.B. (2009) Ecology of seed dormancy and germination of Carex divisa Huds.: Effects of stratification, temperature and salinity. International Journal of Plant Protection, 3 (2): 1735-6814.
  • Hussey, B.M.J., Keighery, G.J., Dodd, J., Lloyd, S.G. & Cousens, R.D. (2007) Western Weeds. A guide to the weeds of Western Australia. 2nd Edition. The Plant Protection Society of Western Australia, Victoria Park.
  • Moore, C.B. & Moore, J.H. (2002) Herbiguide, the pesticide expert on a disk. Herbiguide, PO Box 44 Albany, Western Australia, 6330.