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Cyperus congestus Vahl
Dense Flat-sedge

Reference
Enum.Pl. 2:358 (1805)
Conservation Code
Not threatened
Naturalised Status
Alien to Western Australia
Name Status
Current

Tufted, colonial perennial, grass-like or herb (sedge), 1 m high. Fl. brown, Jul or Oct to Nov or Jan to Mar. Grey sandy clay, sand. Swamps.

Grazyna Paczkowska, Descriptive Catalogue, 3 November 1993
Image

Distribution

IBRA Regions
Avon Wheatbelt, Esperance Plains, Geraldton Sandplains, Jarrah Forest, Swan Coastal Plain, Warren.
IBRA Subregions
Fitzgerald, Katanning, Lesueur Sandplain, Merredin, Northern Jarrah Forest, Perth, Recherche, Southern Jarrah Forest, Warren.
IMCRA Regions
Leeuwin-Naturaliste, WA South Coast.
Local Government Areas (LGAs)
Albany, Armadale, Augusta Margaret River, Broomehill-Tambellup, Bruce Rock, Bunbury, Busselton, Cambridge, Canning, Cockburn, Collie, Coorow, Dandaragan, Denmark, Esperance, Gingin, Gosnells, Harvey, Jerramungup, Kalamunda, Mandurah, Manjimup, Melville, Mundaring, Murray, Nannup, Northam, Perth, Plantagenet, Ravensthorpe, Rockingham, Swan, Wandering, Wanneroo, Waroona, York.

Management Notes (for the Swan NRM Region)

Alternative Names. Cyperus.

General Biology. Growth form. Sedge. Life form. Perennial. Reproduction. Seed. Dispersal. Water.

Notes. Common weed in south western Australian wetlands.

Additional information. Origin. Southern Africa.

Suggested method of management and control. Try 1% glyphosate + Pulse®. 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
Germination         U U              
Active Growth       O Y Y Y Y          
Flowering             Y Y Y Y      
Fruiting                 U U U    
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.
  • 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.
  • USDA, ARS, National Genetic Resources Program (2009) Germplasm Resources Information Network - (GRIN). National Germplasm Resources Laboratory, Beltsville, Maryland. URL: https://npgsweb.ars-grin.gov/gringlobal/taxon/taxonomysimple.aspx - Accessed October 2009.