Cyperus polystachyos Rottb. Bunchy Sedge
Descr.Icon.Rar.Pl. 39 (1773)

Conservation Code: Not threatened
Naturalised Status: Mixed (Native in Part of Range, Naturalised Elsewhere)
Name Status: Current

Brief Description
Grazyna Paczkowska, Thursday 4 November 1993

Shortly rhizomatous, perennial or annual, grass-like or herb (sedge), 0.15-0.6 m high. Fl. green-brown, Dec or Jan to Feb or Apr to Jul. White or wet black sand. In disturbed damp areas.


Beard’s Provinces: Eremaean Province, Northern Province, South-West Province.

IBRA Regions: Dampierland, Geraldton Sandplains, Jarrah Forest, Northern Kimberley, Ord Victoria Plain, Pilbara, Swan Coastal Plain, Victoria Bonaparte.

IBRA Subregions: Dandaragan Plateau, Geraldton Hills, Hamersley, Lesueur Sandplain, Mitchell, Northern Jarrah Forest, Ord, Ord-Victoria Plains P1, Perth, Pindanland, Roebourne, Victoria Bonaparte P1.

IMCRA Regions: Arnhem Wessel, Groote, Pilbara (nearshore).

Local Government Areas (LGAs): Ashburton, Bayswater, Broome, Canning, Chittering, Gingin, Gosnells, Halls Creek, Harvey, Karratha, Kwinana, Melville, Mundaring, Murray, Northampton, Port Hedland, South Perth, Stirling, Subiaco, Swan, Three Springs, Wanneroo, West Arthur, Wyndham-East Kimberley.

Management Notes (for the Swan NRM Region)
Kate Brown and Karen Bettink, Monday 26 August 2019

Alternative Names. Many-spike Flatsedge, Field Sedge.

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

Additional information. Origin. Eastern Australia, cosmpolitan origin.

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
Active Growth Y Y Y Y Y Y Y     O Y Y  
Flowering Y Y Y Y Y Y Y         Y  
Fruiting Y Y Y Y Y                
Manual Removal Y Y Y Y Y Y Y Y Y Y Y Y  
Herbicide Treatment O O O O O O O       Y Y  

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



  • 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: - Accessed October 2009.

Project information and acknowledgements