Perennial, herb. Fl. green. Sand. Limestone cliffs.
Beard’s Provinces: South-West Province.
IBRA Regions: Jarrah Forest, Swan Coastal Plain.
IBRA Subregions: Perth, Southern Jarrah Forest.
IMCRA Regions: Leeuwin-Naturaliste, WA South Coast.
Local Government Areas (LGAs): Albany, Fremantle, Rockingham, Subiaco.
Alternative Names. Asthma Weed, Sticky Weed, Pellitory-of-the-wall, Kirribilli Curse.
General Biology. Growth form. Herb. Life form. Perennial. Reproduction. Primarily seed, occasionally root fragments. Dispersal. Water, wind, soil, animals (adhesion), ants, tyres. Toxicity. Fine hairs can irritate skin. Pollen causes allergic reactions including asthma.
Notes. Spreads rapidly without control. Sticky hairs make it adhere to skin, clothing and animal fur. Can form seed all year and reproduce within 4 weeks of germinating. Produces large amounts of pollen in spring, summer and autumn. The flowers are dioecious (individual flowers are either male or female, but only one sex is found on any plant). Seed is produced only when male and female plants are present. Declared plant in the Sydney region. Resistance to glyphosate is reported from the Mediterranean region, however glyphosate is an effective treatment in Australia.
Additional information. Origin. Mediterranean, Europe, western tropical Asia. History of use/introduction. Medicinal, introduced with building material. Similar native species. Parietaria debilis.
Suggested method of management and control. Hand pull isolated plants. Regularly spot spray seedlings with 1% glyphosate + pulse. For resprouting rootstock 20% glyphosate + pulse. Will require several follow-up treatments starting 3 weeks after initial treatment. Protective clothing and mask are required if hand-pulling the plant. 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/