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Scientific Name
Synonyms
Family
Common Names
Origin
Cultivation
Naturalised Distribution
Habitat
Habit
Distinguishing Features
Stems and Leaves
Flowers and Fruit
Reproduction and Dispersal
Environmental Impact
Legislation
Similar Species
Print Fact Sheet
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Click on images to enlarge

dense infestation (Photo: Sheldon Navie)

habit (Photo: Sheldon Navie)

leaves (Photo: Sheldon Navie)

flower cluster (Photo: Sheldon Navie)

close-up of very hairy young fruit (Photo: Sheldon Navie)

immature fruit (Photo: Sheldon Navie)

mixed infestation of sandplain lupin, Lupinus cosentinii, and white lupin, Lupinus albus (Photo: Sheldon Navie)

Lupinus cosentinii

Scientific Name

Lupinus cosentinii Guss.

Synonyms

Lupinus digitatus Forssk. (misapplied)
Lupinus hirsutus L. (misapplied)
Lupinus pilosus L. (misapplied)
Lupinus varius L. (misapplied)

Family

Fabaceae (Queensland, the ACT, Victoria, Tasmania, and the Northern Territory)
Fabaceae: sub-family Faboideae (New South Wales)
Leguminosae (South Australia)
Papilionaceae (Western Australia)

Common Names

blue lupin, lupin, sand plain lupin, sandplain lupin, sandplain lupine, Western Australian blue lupin, WA blue lupin

Origin

Native to north-western Africa (i.e. Morocco and Tunisia) and south-western Europe (i.e. Sardinia, Sicily, Corsica, southern Portugal and south-western Spain).

Cultivation

Widely cultivated as a fodder and grain crop in the temperate regions of Australia.

Naturalised Distribution

Naturalised in many parts of southern and eastern Australia (i.e. in south-eastern Queensland, in the coastal districts of northern and central New South Wales, in south-eastern and southern South Australia and in the south-western and western parts of Western Australia). Also naturalised on Norfolk Island.

Habitat

A common weed of disturbed sites, waste areas, roadsides, parks, cropping areas, open woodlands, waterways and coastal environs in the temperate regions of Australia (occasionally also found in semi-arid and sub-tropical regions).

Habit

A large, upright (i.e. erect), short-lived (i.e. annual), herbaceous plant usually growing 0.2-1.2 m tall, but occasionally reaching up to 1.4 m in height.

Distinguishing Features

Stems and Leaves

The stems are much-branched and densely covered in short whitish hairs (i.e. pubescent or shortly villous) about 1 mm long. Younger stems are greenish in colour while older stems towards the base of the plant may become somewhat woody in nature.

The alternately arranged leaves are compound with 7-13 leaflets, which all radiate from the same point like the fingers of a hand (i.e. they are palmately compound). These leaves (usually 15.5-21.5 cm long) are borne on velvety hairy stalks (i.e. pubescent petioles) 3-15 cm long. The leaflets (1.8-7 cm long and 5-16 mm wide) are elongated in shape (i.e. oblanceolate to oblong) with tapered (i.e. attenuate) bases and shortly pointed tips (i.e. mucronate apices). Their surfaces are silky hairy (i.e. pubescent), particularly their undersides, and their margins are entire.

Flowers and Fruit

The numerous flowers are arranged in elongated clusters at the tips of the branches (i.e. in terminal racemes). These clusters (5-15 cm long) are borne on short stout stalks (i.e. peduncles) about 3 cm long. Individual flowers are arranged in groups (i.e. whorls) along the main stem of the flower clusters and are borne on very short stalks (i.e. pedicels) 2-4.5 mm long. These pea-shaped flowers (12-17 mm long) are mostly blue in colour, though the uppermost petal (i.e. standard) in each flower often has a whitish or yellowish base. They also have two side (i.e. lateral) petals and two lower petals that are fused together into a single folded petal (i.e. keel) with a whitish base. The five green sepals (8-12 mm long) are hairy (i.e. villous) and fused together at the base into a short tube (i.e. calyx tube). Each flower also has ten stamens, with their filaments being fused together into a tube, and an ovary topped with a style and stigma. Flowering occurs mostly during spring (i.e. from August to November).

The elongated pods (4-6 cm long and 1.3-1.7 cm wide) are densely hairy (i.e. villous or pubescent) and usually contain 3-5 seeds. They are somewhat flattened (i.e. compressed) and turn from greenish to brownish in colour as they mature. The seeds are almost circular and somewhat flattened (6-9 mm long, 4-7 mm wide and 3-4 mm tall) with rough surfaces. They are light grey, greyish-brown or brown with darker brown or blackish coloured markings (i.e. mottled).

Reproduction and Dispersal

This species reproduces only by seed.

The seeds are often dispersed to new areas during the transport of this species as a grain and fodder crop. They may also be spread in water and contaminated soil.

Environmental Impact

Sandplain lupin (Lupinus cosentinii) is a significant environmental weed in Western Australia, but is not regarded as a serious problem in other parts of Australia. It has the ability to invade undisturbed bushland and can change the structure, composition and function of natural ecosystems. For these reasons it was recently ranked as a highly invasive species in the Environmental Weed Strategy for Western Australia.

Sandplain lupin (Lupinus cosentinii) is a widespread and serious weed of roadsides, woodlands, heathlands, river edges, swamps, lake margins and disturbed natural vegetation from Carnarvon to Esperance in Western Australia. It is also becoming widespread in South Australia and is present in conservation areas in both of these states (i.e. Blackwall Reach Reserve and Point Walter Bushland in Western Australia and Aldinga Scrub Conservation Park in South Australia).

Legislation

Not declared or considered noxious by any state government authorities.

Similar Species

Sandplain lupin (Lupinus cosentinii) is very similar to several other lupins, all of which are introduced into Australia and some of which are also environmental weeds. The most common of these are narrow-leaved blue lupin (Lupinus angustifolius), white lupin (Lupinus albus), tree lupin (Lupinus arboreus), yellow lupin (Lupinus luteus) and Russell lupin (Lupinus polyphyllus). These species can be distinguished by the following differences: