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Family Fabaceae
Acacia aulacocarpa Benth..

Scientific names Common names
Acacia aulacocarpa Benth. Black wattle (Engl.)
Acacia lamprocarpa O.Schwarz Brush ironbark wattle (Engl.)
Acacia leucodendron "Benth., p.p." . Brown salwood (Engl..)
Racosperma aulacocarpum (Benth.) Pedley . Golden flower salwood (Engl..)
  Grey wattle (Engl.)
  Hickory wattle (Engl.)
  Lancewood (Engl.)
  New Guinea wattle (Engl.)
  Salwood (Engl.)
Acacia aulacocarpa Benth. is an accepted name. The Plant List

Golden flower salwood is an evergreen shrub or tree varying widely in size, from a 3 meter tall shrub to a slender, large tree as high as 40 meters. The trunk in larger trees are free of branches up to 21 meters with the bole100 centimeters in diameter. Bark is generally smooth, but often cracked and fissured at the base of taller trees. Branchlets are glabrous, acute angled, slender to sub-stout. The mature plant does not have true leaves, but rather, leaf-like flattered stems called phyllodes. Phyllodes are dimidiate to subfalcate in shape, glaucous with a slight sheen. with numerous parallel longitudinal nerves. Inflorescences are simple, 1 to 2 per axil; peduncles 4 to 8 millimeters long, spikes 2 to 5 centimeters long, bright golden. Flowers are 5-merous; calyx gamosepalous, shallowly dissected, glabrous. Pods are narrowly oblong, twisted, straight or shallowly curved, 1.5 to 8 centimeters long, 0.8 to 1.5 centimeters wide, woody, resinous, glabrous reddish brown, dehiscing along the dorsal suture. Seeds are oblique ovate to oblong or elliptic, 3.5 to 5 millimeters long brown to black, with a grayish aril. (2) (4) (8)

- Introduced.
- Cultivated.
- Classified as Near Threatened" in the ICUN Red List of Threatened Species, 2011.
- Native to Australia, New Guinea, Irian Jaya.

- Study of A. aulacocarpa for chemical constituents showed every size had high alpha-cellulose (average 65%) low lignin (18-20%), low ash (0.02 to 0.04%) and pentosan (average 15%). (see study below) (6)

- Bark considered astringent.
- Study has suggest antibacterial properties.


- No reported folkloric medicinal use in the Philippines.
- Agroforestry: A useful shade tree. Popular species for reforestation of poor soils.
- Tannins: Inner bark yields tannins.

- Wood: Pale brow to gray-brown, attractively streaked with gray bands. Hard and moderately durable, used as construction timber, for furniture, cabinetry, flooring, tool handles, boxes, joinery and turnery.
- Fiber: An excellent source of fiber for pulping and paper-making. (2)
- Fuel: Excellent source of fuel with energy value of 21,600 kJ/kg. Its charcoal has an energy value of 37,000 kJ/kg. (2)

Antimicrobial / Leaves:
Study of methanolic extract of A. aulacocarpa leaves inhibited 6 of 14 bacterial tested (43%). It displayed no activity against fungi tested. The extract displayed low toxicity in the Artemia franciscana bioassay. Results validate Australian aboriginal usage of the plant as antiseptic agents. (3)
Source of Pulp and Paper: Study evaluated the chemical constituents of A. aulacocarpa with age of 17 years with small-, medium- and large-sized culm. Results showed every size had high alpha-cellulose (average 65%) low lignin (18-20%), low ash (0.02 to 0.04%) and pentosan (average 15%). Results suggest A. aulacocarpa has potential use as raw material for pulp and paper production (5)
Antibacterial / Leaves: Study evaluated 39 methanolic extracts from 25 Australian native plants for antibacterial activity against two Gram positive (Bacillus cereus, B subtilis) and two gram negative bacteria ( (Aeromonas hydrophiia, Pseudomonas fluorescens) using disc diffusion study. Acacia aulococarpa exhibited good antibacterial activity against A. hydrophilia (7.7 ± 0.6, P. fluorescens 10.6 ± 0.3, and B. cereus 9.0 ± 1.0. (7)


June 2020

                                                  PHOTOS / ILLUSTRATIONS
IMAGE SOURCE: Photo: Acacia aulacocarpa / © Paten Park Native Nursery / click on imge to go to source page / Paten Park Native Nursery
OTHER IMAGE SOURCE: Photograph / Pod Close-up / Acacia aulacocarpa: Hickory wattle / © (Oxley Creek Catchment Association / click on image to go to source page / OXLEY CREEK

Additional Sources and Suggested Readings
Acacia aulacocarpa Benth. / Synonyms / The Plant List
Acacia aulacocarpa / Ken Fern: Tropical Plant database / Useful Tropical Plants
Antimicrobial Activity of Acacia aulacocarpa and Acacia complanta Methanolic Extracts
/ Ian Edwin Cock /
Pharmacognosy Communications, Jan 2012; 2(1): pp 66-71 / DOI: 10.5530/pc.2012.1.12
Acacia aulacocarpa / Wikipedia
Acacia aulacocarpa / The IUCN Red List of Threatened Species 1998
Study on chemical constituents of Acacia aulacocarpa / 2009 / Thai National AGRIS Centre, Kasetsart University
Antibacterial Activity of Selected Australian Native Plant Extracts / I E Cock /
Acacia aulacocarpa / Wattle: Acacias of Australia

It is not uncommon for links on studies/sources to change. Copying and pasting the information on the search window or using the DOI (if available) will often redirect to the new link page. (Citing and Using a (DOI) Digital Object Identifier)

                                                            List of Understudied Philippine Medicinal Plants

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