Low sprawling perennial, herb, to 0.5 m high, to 0.5 m wide. Fl. yellow, May to Nov. Roadverges.
Beard’s Provinces: Eremaean Province, South-West Province.
IBRA Regions: Carnarvon, Swan Coastal Plain.
IBRA Subregions: Cape Range, Dandaragan Plateau, Perth.
Local Government Areas (LGAs): Ashburton, Canning, Chittering, Cockburn, Dandaragan, Gosnells, Mandurah, Melville, Murray, Nedlands, Perth, South Perth, Stirling.
Alternative Names. Ragged Evening Primrose.
General Biology. Growth form. Herb. Life form. Perennial. Reproduction. Seed. Seedbank persistence. Long term.
Notes. Prefers full sunlight, dry conditions and sandy soil where the ground vegetation is low and sparse. Most growth and development occurs during cooler spring conditions. Generally flowers at night. Germinates over a range of temperatures, and decreases with increasing pH (acidity), with greatest germination occurring at pH 4. Emergence is highest when seed is buried at depths of 0.5 cm. Germination decreases with increasing burial depth, and generally no seed emerges from a depth of 10 cm.
Additional information. Origin. North America. Similar exotic species. Oenothera stricta, O. glazioviana, O. drummondii, O. mollissima.
Suggested method of management and control. Control in seedling stage, as older plants are relatively resistant to herbicides, including glyphosate. Hand remove small populations, ensuring removal of entire root stystem. Spot spray chlorsulfuron 0.4 g/10 L + spray oil. 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.
|Flowering||Y||Y||Y||Y||O||O||O||O||O||O||O||Y||Can flower throughout the year|
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/