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Genista monspessulana (L.) L.A.S.Johnson

Contr.New South Wales Natl.Herb. 3:98 (1962)
Conservation Code
Not threatened
Naturalised Status
Alien to Western Australia
Name Status

Erect shrub, 1-5 m high, leaves trifoliolate, petiolate, standard more or less glabrous. Fl. yellow, Aug or Nov or Jan. Loam, lateritic sand, black peaty sand. Edging rivers and roadsides.

Amanda Spooner, Descriptive Catalogue, 17 August 2007

Scientific Description

Erect, shrub, spindly shrub (broom-like). Stems terete, not spiny, hairy; pustules or glands absent. Leaves or phylloclades clearly present, compound, alternate, not continuous with stem, 10-25 mm long, hairy, with simple hairs, flat with flat margins; margins entire; tubercles absent; pustules or glands absent. Stipules apparently absent even from the youngest leaves. Pedicel present, 2-3 mm long, hairy. Bracteoles 1.2-1.6 mm long. Calyx 5-6 mm long, not accrescent, hairy, with simple hairs, ribless; pustules or glands absent. Corolla 10-13 mm long, uniformly coloured, yellow; claws absent; standard 11-13 mm long, glabrous, not auriculate, wings 10-11.5 mm long, not auriculate, keel 9-12 mm long, not beaked, not auriculate, glabrous. Stamens; anthers 0.5-0.7 mm long, at two different levels (filaments alternately long and short); filaments united in a closed sheath, 6-9 mm long. Ovary stipitate, hairy or glandular; style 9.2-13 mm long, hairy or glandular towards the base, not bearded, terete. Fruit dehiscent (a pod or follicle), 15-20 mm long, 5-6 mm wide, sessile or subsessile, constricted between the seeds, round in cross-section, hairy, with simple hairs, not beaked. Flowers in January, August and November. Occurs in the South-West Botanical Province, in the Avon Wheatbelt, Jarrah Forest, Warren and Swan Coastal Plain IBRA regions.

C. Hollister and K.R. Thiele, 24 October 2023


IBRA Regions
Avon Wheatbelt, Jarrah Forest, Swan Coastal Plain, Warren.
IBRA Subregions
Katanning, Northern Jarrah Forest, Perth, Southern Jarrah Forest, Warren.
IMCRA Regions
WA South Coast.
Local Government Areas (LGAs)
Albany, Armadale, Augusta Margaret River, Bridgetown-Greenbushes, Busselton, Donnybrook-Balingup, Kojonup, Manjimup, Narrogin, Plantagenet, Wandering.

Management Notes (for the Swan NRM Region)

General Biology. Growth form. Shrub. Reproduction. Seed. Dispersal. Explosive action, birds, ants, water, vehicles, slashing, soil movement, garden refuse. Time to first flowering. 2 years. Toxicity. Seeds are poisonous to humans and livestock. Vegetative regeneration strategy. Resprouts from base. Seedbank persistence. Long, 10+ years. Fire response. Adult plants may respout following fire. Fire stimulates germination of soil-stored seed.

Notes. Fixes nitrogen and increases soil fertility . Can increase frequency and intensity of fire.

Additional information. Origin. Northen Africa, southern Europe, western Asia. History of use/introduction. Garden escape.

Suggested method of management and control. Hand pull or dig out small seedlings ensuring removal of all roots. For mature plants cut and paint with 50% glyphosate or try basal bark with 250 ml Access® in 15 L of diesel. Monitor site for recruitment from seedbank. 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.

Management Calendar

Calendar Type Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Comments
Flowering O O         O Y Y Y Y O  
Fruiting Y O             O Y Y Y  
Germination     Y Y Y       Y Y Y    
Active Growth         O Y Y Y Y Y Y O  
Optimum Treatment           Y Y Y Y Y Y    

Legend: Y = Yes, regularly, O = Occasionally, U = Uncertain, referred by others but not confirmed.



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