Isolepis hystrix (Thunb.) Nees
Linnaea 7:496 (1832)

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

Brief Description
Grazyna Paczkowska, Tuesday 4 July 1995

Annual, grass-like or herb (sedge), c. 0.025 m high, spikelets squarrose, glumes with an awn at least as long as its body; stamens 1-2; style 3-branched. Fl. green, Nov. Winter-wet clay flats.


Beard’s Provinces: South-West Province.

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

IBRA Subregions: Avon Wheatbelt P2, Dandaragan Plateau, Fitzgerald, Northern Jarrah Forest, Perth, Southern Jarrah Forest.

Local Government Areas (LGAs): Albany, Gingin, Gosnells, Jerramungup, Moora, Murray, Serpentine-Jarrahdale, Swan, Victoria Plains, Wagin, Waroona, West Arthur.

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

General Biology. Growth form. Herb. Life form. Annual. Reproduction. Seed. Dispersal. Wind, machinery.

Notes. Forms dense monspecific stands. Becoming increasingly common in clay-based wetlands on the eastern side of the Swan Coastal Plain. Could pose a major threat to wetland habitats throughout Western Australia.

Additional information. Origin. South Africa.

Suggested method of management and control. Try spot spraying 10 ml/L glyphosate while plants are actively growing. Use Roundup Biactive® where surface water is present. 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 U U          
Active Growth           Y Y Y Y Y Y    
Flowering                     Y    
Fruiting U                     U  
Optimum Treatment           U U U U U      

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.
  • Keighery, G.J. (1999) Predicting and preventing the West’s environmental weeds of the next century. In Proceedings of the 12th Australian Weeds Conference, Hobart (eds. A.C. Bishop, M. Boersma and C.D. Barnes). Tasmanian Weed Society, Davenport.
  • Parsons, J.M. (ed.) (1995) The Australian weed control handbook. 10th Edition. Inkata Press, Melbourne.

Project information and acknowledgements