Fine Art

Acacia acradenia foliage and flower buds

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Rosids
Cladus: Eurosids I
Ordo: Fabales

Familia: Fabaceae
Subfamilia: Caesalpinioideae
Tribus: Acacieae
Genus: Acacia
Species: Acacia acradenia

Acacia acradenia F.Muell., 1888


Racosperma acradenium (F.Muell.) Pedley

Native distribution areas:
Acacia acradenia

Continental: Australasia
Regional: Australia
Northern Territory, Queensland, South Australia, Western Australia

References: Brummitt, R.K. 2001. TDWG – World Geographical Scheme for Recording Plant Distributions, 2nd Edition
Primary references

Mueller, F.J.H. v., 1858. Journal of the Proceedings of the Linnean Society. Botany 3: 142.


Govaerts, R. et al. 2020. Acacia acradenia in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the internet. Accessed: 2020 Jul 23. Reference page.
International Plant Names Index. 2019. Acacia acradenia. Published online. Accessed: Jul 23 2019. 2019. Acacia acradenia. Missouri Botanical Garden. Published on the internet. Accessed: 2019 Jul 23.
Hassler, M. Jul. Acacia acradenia. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. Jul. Species 2000 & ITIS Catalogue of Life. Published on the internet. Accessed: Jul 23 {{{3}}}. Reference page.
USDA, ARS, Germplasm Resources Information Network. Acacia acradenia in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 09-Oct-10.

Vernacular names

Acacia acradenia, commonly known as Velvet Hill wattle and silky wattle,[1] is a shrub or tree belonging to the genus Acacia and the subgenus Juliflorae. It is native to northern and central Australia. The Indigenous Australian group the Nyangumarta peoples know it as walypuna[1] the Alyawarr call it ampwey, the Jaminjung and Ngaliwurru know it as Mindiwirri, the Jaru as binbali or gundalyji, the Kaytetye as ampweye or arwele and the Warlpiri as ngardurrkura.[2]


The tree or shrub typically grows to a height of 0.9 to 4 metres (3.0 to 13.1 ft)[3] but can be as high as 7.5 metres (25 ft). It is generally V-shaped with an open and usually spindly form. It usually divides above ground level to form some main stems that are straight, diagonally spreading to erect and covered in smooth light grey bark except toward the base where it can become longitudinally fissured. The phyllodes are usually obliquely elliptic to narrowly elliptic in shape that becomes narrowed at both ends. The phyllodes can be 4 to 16 centimetres (2 to 6 in) in length and 10 to 40 millimetres (0.39 to 1.57 in) in width with numerous longitudinal nerves.[1] It can bloom at any time of year[4] but mostly between March and July and October and November producing yellow flowers.[3] Each simple inflorescences occurs in pairs at the axil of the phyllodes. The flowers-spikes are 2 to 7 cm (0.8 to 2.8 in) in length densely packed with golden flowers. Following flowering many seed pods form that are crowded on the receptacles. The pendulous stright to slightly curved pods have a narrowly linear shape and are 4 to 11 cm (1.6 to 4.3 in) in length and 2.5 to 4 mm (0.098 to 0.157 in) wide. The shiny brown seeds within have a narrowly obloid to obloid-ellipsoid shape and have a length of around 4 to 5 mm (0.157 to 0.197 in).

The species is relatively short lived, is easily killed by fire but sprouts readily from seeds.[1]

The species was first formally described by the botanist Ferdinand von Mueller in 1888 as part of the work Iconography of Australian Species of Acacia and Cognate Genera Decas. It was reclassified as Racosperma acradenium in 1987 by Leslie Pedley then transferred back to the genus Acacia in 2006. The only other synonyms are Acacia curvicarpa and Acacia acradena.[5]

The specific epithet is taken from the Greek words acron meaning tip and adenos meaning (gland which is thought to be referring to gland-like apical point at the tip of the phyllodes.

In tropical parts of the Northern Territory and Queensland A. acradenia is often mistaken for Acacia umbellata.[1]

The type specimen was collected by von Mueller near Depot Creek in the Northern Territory.[4]

The species is found throughout the Northern Territory extending east into Queensland as far as Prairie[4] and Western Australia.[5] In Western Australia it has a scattered distribution through the Kimberley, Pilbara and northern Goldfields regions.[3] It is found on rocky plains or rocky hills, and along watercourses or damp areas. It grows well in stony soils, skeletal loams or clay pans[1][3] as part of spinifex and Eucalypt[4] communities. Localized colonies form in areas following disturbance such as fire.[1]

Indigenous Australians use the species as a food source, water source, shade or shelter and to make weapons and implements.[2]
See also

List of Acacia species


"Acacia acradenia". Wattles of the Pilbara. Department of Environment and Conservation. 2010. Retrieved 12 October 2018.
"Acacia acradenia F.Muell". NT Flora. Northern Territory Government. Retrieved 12 October 2018.
"Acacia acradenia". FloraBase. Western Australian Government Department of Parks and Wildlife.
"Acacia acradenia". World Wide Wattle. Western Australian Herbarium. Retrieved 12 October 2018.
"Acacia acradenia F.Muell". Atlas of Living Australia. Global Biodiversity Information Facility. Retrieved 12 October 2018.

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