Sometimes rhizomatous, tufted annual or perennial (rarely), grass-like or herb, 0.1-0.6(-1.2) m high. Fl. green, Jan to Aug. Sand, red loam, black peaty clay.
Beard’s Provinces: Eremaean Province, Northern Province, South-West Province.
IBRA Regions: Avon Wheatbelt, Carnarvon, Central Kimberley, Central Ranges, Dampierland, Esperance Plains, Geraldton Sandplains, Gibson Desert, Great Sandy Desert, Northern Kimberley, Ord Victoria Plain, Pilbara, Swan Coastal Plain, Victoria Bonaparte.
IBRA Subregions: Avon Wheatbelt P1, Avon Wheatbelt P2, Chichester, Fitzgerald, Fitzroy Trough, Geraldton Hills, Hamersley, Hart, Lateritic Plain, Lesueur Sandplain, Mackay, Mann-Musgrave Block, Mitchell, Ord, Ord-Victoria Plains P1, Perth, Pindanland, Roebourne, South Kimberley Interzone, Victoria Bonaparte P1, Wooramel.
Local Government Areas (LGAs): Ashburton, Belmont, Broome, Carnamah, Coorow, Derby/west Kimberley, East Pilbara, Gingin, Greater Geraldton, Halls Creek, Irwin, Joondalup, Karratha, Kellerberrin, Melville, Nedlands, Ngaanyatjarraku, Northam, Northampton, Nungarin, Perth, Ravensthorpe, Rockingham, Shark Bay, Wagin, Wyndham-East Kimberley.
Alternative Names. Burrgrass, walkaway burr.
General Biology. Growth form. Grass. Life form. Annual, caespitose. Reproduction. Seed. Dispersal. Wind, mammals, water, clothing. Photosynthetic Pathway. C4. Seedbank persistence. Medium, 1-5 years. Fire response. Stimulates germination of soil-stored seed.
Notes. Common in disturbed sites, particularly on coastal dunes and limestone soils. Also found on cultivated and abandoned fields, pastures, roadsides, lawns, dunes and along river sands. Under dry conditions plants are short-lived, small, and produce few burrs, while under moist conditions they may be long-lived, large and produces many burrs. Rapidly colonises bare or open ground. Withstands repeated defoliation in lawns, harvesting in forage crops or in pastures. Burrs readily attach to clothing or animals and can be carried by water.
Additional information. Origin. South America, southern North America. Similar exotic species. Cenchrus ciliaris.
Suggested method of management and control. Prevent seed set. Manually remove small infestations and isolatated plants. Spray with Verdict 520® 5 ml/10 L (250 ml/ha) + wetting agent or spot spray with 1% glyphosate. Follow-up with seedling control. 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.
Legend: Y = Yes, regularly, O = Occasionally, U = Uncertain, referred by others but not confirmed.
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Western Australian Herbarium (1998–). FloraBase—the Western Australian Flora. Department of Biodiversity, Conservation and Attractions. https://florabase.dpaw.wa.gov.au/