Erect, much-branched annual, herb, 0.2-1.5 m high. Fl. blue/white, Aug to Nov. Sand, loam, clay. Cultivated, occasionally naturalised in disturbed areas.
Beard’s Provinces: South-West Province.
IBRA Regions: Avon Wheatbelt, Geraldton Sandplains, Jarrah Forest, Swan Coastal Plain.
IBRA Subregions: Avon Wheatbelt P1, Avon Wheatbelt P2, Dandaragan Plateau, Lesueur Sandplain, Northern Jarrah Forest, Perth, Southern Jarrah Forest.
Local Government Areas (LGAs): Bunbury, Busselton, Carnamah, Chittering, Cockburn, Corrigin, Dardanup, Donnybrook-Balingup, Dowerin, Gingin, Harvey, Kalamunda, Melville, Mundaring, Murray, Nedlands, Northam, Perth, Plantagenet, Stirling, Swan, Three Springs.
Erect, herb. Stems terete, not spiny, hairy; pustules or glands absent. Leaves or phylloclades clearly present, compound, alternate, continuous with stem, 40-75 mm long, hairy, with simple hairs, flat with flat margins; margins entire; tubercles absent, leaflets 7-9, palmately arranged, terminal leaflet present, sessile; pustules or glands absent. Stipules present and persistent to older leaves, 5(-7) mm long, without glands, ribless. Pedicel present, 2-3 mm long, hairy. Bracteoles present and persistent. Calyx 7-8.5 mm long, not accrescent, hairy, with simple hairs, ribless; pustules or glands absent. Corolla 13-15.5 mm long, uniformly coloured, blue; claws present; standard 12.5-14 mm long, glabrous, not auriculate, wings 12 mm long, not auriculate, keel 11-13 mm long, beaked, not auriculate, glabrous. Stamens ten; anthers 2-2.2 mm long, at two different levels (filaments alternately long and short); filaments united in a closed sheath, 7-11.5 mm long. Ovary sessile or subsessile, hairy or glandular; style 14.7-15.5 mm long, hairy or glandular towards the base, not bearded, terete. Fruit dehiscent (a pod or follicle), 40-55 mm long, 13-15 mm wide, sessile or subsessile, constricted between the seeds, flat or compressed, hairy, with simple hairs, not beaked. Flowers in August, September, October and November. Occurs in the South-West Botanical Province, in the Geraldton Sandplains, Avon Wheatbelt, Jarrah Forest and Swan Coastal Plain IBRA regions.
Alternative Names. Australian Sweet Lupin.
General Biology. Growth form. Herb. Life form. Annual. Reproduction. Seed. Dispersal. Water, soil movement, planting for agriculture. Seedbank persistence. short-medium term.
Notes. Most varieties are poorly adapted to alkaline and calcareous soils. In a high rainfall season or location, seed set will be delayed considerably. Late season high temperatures can induce poor seed-set. Able to increase soil nitrogen due to compatable bacteria, which may aid establishment of other introduced plants. Has hard-coated impermeable seed.
Additional information. Origin. Mediterranean. History of use/introduction. Widely cultivated for seed (grain), animal feed. Similar exotic species. Lupinus cosentinii.
Suggested method of management and control. Hand remove scattered plants. Spray dense infestations with metsulfuron methyl 0.1 g/15 L (2-3 g/ha) + wetting agent or spot spray Lontrel® 6 ml/10 L (300 ml/ha) + wetting agent to late flowering, this will prevent seed set. 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/