Classification of the genus Acacia (in the wider sense) has been subject to considerable debate. It is generally agreed that there are valid reasons for breaking it up into several distinct genera, but there has been disagreement over the way this should be done. As of 2017, it is widely (but not completely) accepted that the section that includes the majority of the Australian species (including this one) should retain the name Acacia, whilst other sections of the genus should be transferred to the genera Acaciella, Mariosousa, Senegalia and Vachellia[].

Common Name:

General Information

Acacia stipuligera is a usually multi-stemmed shrub or small tree with a spreading, rounded top; it can grow 2 - 6 metres tall and 3 - 7 metres wide. The plant produces suckers and can form thickets[, ]. Although it produces true leaves as a seedling, like most members of this section of the genus, the mature plant does not have true leaves but has leaf-like flattened stems called phyllodes[].
The seeds are a traditional food for the native Australians who often harvested it from the wild. They have potential for use as a subsistence food for humans. The plant can be used in soil stabilization projects, and is an excellent ornamental.

Known Hazards

The seed of many Acacia species, including this one, is edible and highly nutritious, and can be eaten safely as a fairly major part of the diet. Not all species are edible, however, and some can contain moderate levels of toxins[]. Especially when harvesting from the wild, especial care should be taken to ensure correct identification of any plants harvested for food[].
Especially in times of drought, many Acacia species can concentrate high levels of the toxin Hydrogen cyanide in their foliage, making them dangerous for herbivores to eat.

Botanical References

Range

Australia - northeastern Western Australia, Northern Territory, Queensland

Habitat

Found in red sandy soils and loam in tall open shrubland, woodland, and open sites where spinifex grasses are abundant[].

Properties

Edibility Rating
Medicinal Rating
Other Uses Rating
Habit	Shrub
Height	4.00 m
Growth Rate	Medium
Pollinators	Insects
Cultivation Status	Ornamental, Wild

Cultivation Details

Acacia stipuligera is a plant of the hot, semi-arid and arid zones of tropical northern Australia, where it can be found at elevations up to 525 metres. The summers are very hot, with a mean maximum temperature for the hottest month of 34 - 41°c and a mean minimum temperature for the coolest month of 9 - 12°c. The area is largley frost-free, though very occasional frosts are recorded from higher elevations in the south of its range, with the lowest ever recorded temperature being −4°c[]. Mean annual rainfall is generally within the range 125 - 700, with the majority falling during the hotter part of the year[].
Requires a sunny position. Grows in the wild mainly on well-drained, predominately deep red sands and sandy loams, mainly of an acid to neutral pH, though also occasionally found on sandy soils over limestones[].
A moderately fast-growing tree, though short-lived, usually dieing when around 10 years old[].
The seeds of most acacia species can be quickly and efficiently harvested at full maturity without the need for any specialised equipment. Small seed-bearing branches can be cut and beaten on sheets, or bushes can be beaten or shaken directly onto large sheets[].
This species has a symbiotic relationship with certain soil bacteria; these bacteria form nodules on the roots and fix atmospheric nitrogen. Some of this nitrogen is utilized by the growing plant but some can also be used by other plants growing nearby[].

Edible Uses

Seed - cooked[]. It can be eaten in the same ways as other small legume seeds and is also ground into a powder then used as a flavouring in desserts or as a nutritious supplement to pastries and breads[]. The seeds are relatively soft-coated; they are produced in profusion in good seasons; and are easily harvested, A traditional food of the native Australians, it has potential as a famine or subsistence food for humans[]. The seedpods are 55 - 135mm long and 3 - 4 mm wide, with dark brown, narrowly oblong seed 4.5 - 5.5mm long[].
Acacia seeds are highly nutritious and contain around 26% protein, 26% available carbohydrate, 32% fibre and 9% fat. The fat content is higher than most legumes with the aril providing the bulk of fatty acids present. These fatty acids are largely unsaturated. The energy content is high in all species tested, averaging 1480 ±270 kJ per 100g. The seeds are low glycaemic index foods - the starch is digested and absorbed very slowly, producing a small, but sustained rise in blood glucose and so delaying the onset of exhaustion in prolonged exercise[].

The ground seed can be used to produce a high quality, caffeine-free coffee-like beverage[].

Medicinal

The bark of all Acacia species contains greater or lesser quantities of tannins and are astringent. Astringents are often used medicinally - taken internally, for example. they are used in the treatment of diarrhoea and dysentery, and can also be helpful in cases of internal bleeding. Applied externally, often as a wash, they are used to treat wounds and other skin problems, haemorrhoids, perspiring feet, some eye problems, as a mouth wash etc[, ].
Many Acacia trees also yield greater or lesser quantities of a gum from the trunk and stems. This is sometimes taken internally in the treatment of diarrhoea and haemorrhoids[].

Agroforestry Uses:

The species has potential for sand stabilisation and should make an outstanding ornamental under cultivation (although rather short-lived)[].

Other Uses

A gum obtained from the stems and branches has similar features to the gums from Acacia torulosa, Acacia tumida and Acacia difficilis. It has a low rhamnose content, negative rotations and high values for nitrogen, methoxyl and uronic acid groups. It is unique for an Acacia in the formation of a loose gel during dialysis[].

The heartwood is dark brown; it is demarcated from the broad band of pale yellowish sapwood. It has a basic density of 810 kg/m3. The wood is usually available only in small dimensions and so has little application[].
The wood should be suitable for fuel[].

Propagation

The seed of most, if not all, members of this genus has a hard seedcoat and may benefit from scarification before sowing to speed up germination. This can usually be done by pouring a small amount of nearly boiling water on the seeds (being careful not to cook them!) and then soaking them for 12 - 24 hours in warm water. By this time they should have imbibed moisture and swollen - if they have not, then carefully make a nick in the seedcoat (being careful not to damage the embryo) and soak for a further 12 hours before sowing.
Acacia seeds that have matured fully on the bush and have been properly dried have a hard seed coat and can be stored in closed containers without deterioration for 5 - 10 years or more in dry conditions at ambient temperatures. It is best to remove the aril, which attracts weevils and can lead to moulds forming. The arils are easilyremoved by placing the seeds in water and rubbing them between the hands, then drying the seeds and winnowing them[].

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