Cyperus congestus Vahl Dense Flat-sedge
Enum.Pl. 2:358 (1805)

Conservation Code: Not threatened
Naturalised Status: Alien to Western Australia
Name Status: Current

Brief Description
Grazyna Paczkowska, Wednesday 3 November 1993

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.

Distribution

Beard’s Provinces: South-West Province.

IBRA Regions: Avon Wheatbelt, Esperance Plains, Geraldton Sandplains, Jarrah Forest, Swan Coastal Plain, Warren.

IBRA Subregions: Avon Wheatbelt P1, Avon Wheatbelt P2, Fitzgerald, Lesueur Sandplain, 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)
Kate Brown and Karen Bettink, Thursday 21 December 2017

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.

Project information and acknowledgements