Erect or procumbent annual, herb, 0.05-0.4 m high. Fl. green-yellow, Jul to Dec or Jan. Disturbed sites.
Beard’s Provinces: South-West Province.
IBRA Regions: Avon Wheatbelt, Esperance Plains, Geraldton Sandplains, Jarrah Forest, Mallee, Swan Coastal Plain, Warren.
IBRA Subregions: Avon Wheatbelt P2, Fitzgerald, Geraldton Hills, Perth, Recherche, Southern Jarrah Forest, Warren, Western Mallee.
IMCRA Regions: Central West Coast, Leeuwin-Naturaliste, WA South Coast.
Local Government Areas (LGAs): Albany, Augusta Margaret River, Busselton, Cockburn, Cottesloe, Cranbrook, Denmark, Esperance, Fremantle, Gnowangerup, Greater Geraldton, Irwin, Manjimup, Melville, Murray, Nannup, Nedlands, Perth, Pingelly, Ravensthorpe, Rockingham, South Perth, Stirling, Swan, Wanneroo.
Alternative Names. Radium Weed, Cancer Weed, Milkweed.
General Biology. Growth form. Herb. Life form. Annual. Reproduction. Seed. Dispersal. Ants, water, soil movement. Toxicity. Sap is poisonous and irritant.
Notes. Colonises degraded and disturbed sites. Contains natural insecticides. Seed has elaiosomes (fleshy appendages) allowing them to be dispersed by ants.
Additional information. Origin. North Africa, temperate and tropical Asia, Europe. History of use/introduction. Seed contaminant, medicines. Similar exotic species. Euphorbia terracina, E. lathyrus.
Suggested method of management and control. Spray metsulfuron methyl at 0.1 g/15 L (2.5 g/ha) + wetting agent or glyphosate at 0.5% while 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.
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/