Botanical Name: Acacia decurrens
Species: A. decurrens
Synonyms: Mimosa decurrens.
Habitat : Acacia decurrens is native to eastern New South Wales, including Sydney, the Greater Blue Mountains Area, the Hunter Region, and south west to the Australian Capital Territory
It grows naturally in woodlands and dry sclerophyll forests in New South Wales, with associated trees such as Eucalyptus punctata and E. crebra. In areas where it has become naturalised, Sydney green wattle (Acacia decurrens) is generally found on roadsides, along creeklines and in waste areas. It also grows in disturbed sites nearby bushlands and open woodlands.
Despite its invasive nature, it has not been declared a noxious weed by any state or Australian government body
Acacia decurrens is a fast-growing tree, reaching anywhere from 2 to 15 m (7-50 ft) high. The bark is brown to dark grey colour and smooth to deeply fissured longitudinally with conspicuous intermodal flange marks. The branchlets have longitudinal ridges running along them that are unique to the species. Young foliage tips are yellow. .
Alternately arranged leaves with dark green on both side. Stipules are either small or none. Base of petiole swollen to form the pulvinus. Leaf blade is bipinnate. Rachis is 20-120mm long, angular and hairless. 15-45 pairs of widely spaced small leaflets (pinnules) are connected each other and 5-15 mm long by 0.4-1 mm wide, straight, parallel sided, pointed tip, tapering base, shiny and hairless or rarely sparsely hairy leaves.
The small yellow or golden-yellow flowers are very cottony in appearance and are densely attached to the stems in each head with 5-7 mm long and 60-110 mm long axillary raceme or terminal panicle. They are bisexual and fragrant. The flowers have five petals and sepals and numerous conspicuous stamens. Ovary is superior and has only one carpel with numerous ovules.
Flowering is followed by the seed pods, which are ripe over November to January.
Dark brown or reddish brown to black colour of the seed are located inside of parallel sided, flattish, smooth pod. They are 20-105 mm long by 4-8.5 mm wide with edges. Seed opens by two valves. Pods are initially hairy but they become hairless when they grow.
Cultivation & propagation :
Acacia decurrens adapts easily to cultivation and grows very quickly. It can be used as a shelter or specimen tree in large gardens and parks. The tree can look imposing when in flower.Cultivation of A. decurrens can be started by soaking the seeds in warm water and sowing them outdoors. The seeds keep their ability to germinate for many years.
Fieldwork conducted in the Southern Highlands found that the presence of bipinnate wattles (either as understory or tree) was related to reduced numbers of noisy miners, an aggressive species of bird that drives off small birds from gardens and bushland, and hence recommended the use of these plants in establishing green corridors and revegetation projects.
The flowers are edible and are used in fritters. An edible gum oozing from the tree’s trunk can be used as a lesser-quality substitute for gum arabic, for example in the production of fruit jelly.
Flowers – cooked. Rich in pollen, they are often used in fritters. A gum that exudes naturally from the trunk is edible and is used as a substitute for Gum Arabic in making jellies etc. It is insoluble in water and is of low quality. Larger quantities can be obtained by tapping the trunk. Some species produce a gum that is dark and is liable to be astringent and distasteful, but others produce a light gum and this is sweet and pleasant. It can be sucked like candy or soaked in water to make a jelly. The gum can be warmed when it becomes soft and chewable .
Constituents: Acacia Bark contains from 24 to 42 per cent. of tannin and also gallic acid. Its powerful astringency causes it to be extensively employed in tanning.
Strongly astringent, babul is used to contract and toughen mucous membranes throughout the body in much the same way as witch hazel or oak bark does. Babul may be made into a variety of preparations: for instance, a lotion for bleeding gums, a gargle for sore throats, a wash for eczema, an eyewash for conjunctivitis and other eye problems, and a douche for excessive vaginal discharge. The herb is taken internally to treat diarrhea, mainly in the form of a decoction. In Ayurvedic medicine, babul is considered a remedy that is helpful for treating premature ejaculation. .
Uses for it include chemical products, environmental management, and wood. The bark contains about 37-40% tannin. The flowers are used to produce yellow dye, and the seed pods are used to produce green dye. An organic chemical compound called kaempferol gives the flowers of Acacia decurrens their color. It has been grown for firewood, or as a fast-growing windbreak or shelter tree. The extensive root system of this plant helps to prevent soil erosion.
A yellow dye is obtained from the flowers. A green dye is obtained from the seed pods. The extensive root system of this plant helps to prevent soil erosion. Often grown as a screen in Australia.
Disclaimer : The information presented herein is intended for educational purposes only. Individual results may vary, and before using any supplement, it is always advisable to consult with your own health care provider.