Pentameris airoides Nees False Hairgrass
Sem.Hort.Bot.Vratisl. (1834)

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


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

IBRA Regions: Avon Wheatbelt, Carnarvon, Coolgardie, Esperance Plains, Geraldton Sandplains, Jarrah Forest, Mallee, Murchison, Swan Coastal Plain, Yalgoo.

IBRA Subregions: Avon Wheatbelt P1, Avon Wheatbelt P2, Eastern Goldfield, Eastern Murchison, Geraldton Hills, Lesueur Sandplain, Northern Jarrah Forest, Perth, Recherche, Southern Cross, Tallering, Western Mallee, Western Murchison, Wooramel.

Local Government Areas (LGAs): Armadale, Bruce Rock, Carnamah, Coolgardie, Coorow, Cue, Dalwallinu, Dandaragan, Dundas, Esperance, Gingin, Goomalling, Greater Geraldton, Joondalup, Kent, Kondinin, Koorda, Kulin, Lake Grace, Menzies, Merredin, Moora, Mukinbudin, Murchison, Northam, Perenjori, Shark Bay, Toodyay, Trayning, Wanneroo, Westonia, Wickepin, Wongan-Ballidu, Wyalkatchem, Yalgoo, Yilgarn.

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

Alternative Names. Annual Pentaschistis.

General Biology. Growth form. Grass. Life form. Annual, caespitose. Reproduction. Seed. Dispersal. Wind. Photosynthetic Pathway. C3.

Notes. Adapted to temperate, mesic climates in open habitats.

Additional information. Origin. South Africa. History of use/introduction. Pasture in rangelands, soil stabilisation.

Suggested method of management and control. Prevent seed set. Try low rates of glyphosate otherwise grass-slective herbicide when actively growing. 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      
Germination         O Y Y            
Flowering               O Y Y O    
Fruiting                   Y Y    
Optimum Treatment             U U U        

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



  • Arnold, G.W., Weeldenberg, J.W. & Leone, J. (1998) Herbicide control of exotic annual plant species in Acacia acuminata - Eucalyptus loxophleba woodland in south-western Australia and effects on native ground flora. Plant Protection Quarterly, 13 (1): 39-43.
  • Brown, K. & Brooks, K. (2002) Bushland Weeds: A Practical Guide to their Management. Environmental Weeds Action Network, Greenwood.
  • Carr, G.W., Yugovic, J.V. & Robinson, K.E. (1992) Environmental weed invasions in Victoria. Department of Conservation and Environment, Melbourne.
  • Hester, A.J. & Hobbs, R.J. (1992) Influence of fire and soil nutrients on native and non-native annuals at remnant vegetation edges in the Western Australian wheatbelt. Journal of Vegetation Science, 13 (1): 101-108.
  • Hoare, D.B. (Undated) Grassland species profiles: Pentaschistis airoides (Nees) Stapf. Food and Agriculture Organization of the United Nations URL: - Accessed January 2010.
  • 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.

Project information and acknowledgements