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[
Racosperma excelsum (Benth.) Pedley
Acacia daintreeana F.Muell.
Common Name: Ironwood
Acacia excelsa is an evergreen tree, usually with a weeping habit, growing up to 20 metres tall[
]. Although it produces true leaves as a seedling, llike 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 tree is harvested from the wild for its attractivewood, which is used for cabinet making etc.
Acacia excelsa is a large tree with a widely scattered distribution in southern inland parts of Queensland and New South Wales. It is known to occur within protected areas, its seeds are banked as a conservation measure and the distribution of this species does not meet the criteria to warrant a threatened category and it is known from many localities. The plant is classified as 'Least Concern' in the IUCN Red List of Threatened Species(2013)[
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.
Australia - New South Wales, Queensland
Found in yellow or brown gravelly, sandy or clayey soils in eucalypt woodland[
|Conservation Status||Least Concern
|Other Uses Rating||
Natural regeneration from seed is rapid if the young trees are protected from sheep[
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[
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[
The wood is hard, close-grained, and very tough and elastic. It possesses great beauty for cabinet-work, and has the odour of violets[
A stable hard and dark timber new to the market. It is likely to be very suited to instrument fretboards. The wood is also used by Aboriginal to make spearthrowers and boomerans[
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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