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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 cochlearis

Acacia cochlearis (Labill.) H.L.Wendl., 1820

Acacia multinervia DC.
Mimosa cochlearis Labill.
Racosperma cochleare (Labill.) Pedley

Native distribution areas:
Acacia cochlearis

Continental: Australasia
Regional: Australia
Western Australia

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

Wendland, H.L., 1820. Commentatio de Acaciis Aphyllis 15.


Govaerts, R. et al. 2020. Acacia cochlearis 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 29. Reference page.
International Plant Names Index. 2019. Acacia cochlearis. Published online. Accessed: Jul 29 2019. 2019. Acacia cochlearis. Missouri Botanical Garden. Published on the internet. Accessed: 2019 Jul 29.
Hassler, M. Jul. Acacia cochlearis. 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 29 {{{3}}}. Reference page.
USDA, ARS, Germplasm Resources Information Network. Acacia cochlearis in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 09-Oct-10.

Vernacular names
English: Rigid Wattle

Acacia cochlearis, commonly known as the rigid wattle,[1] is a shrub of the genus Acacia and the subgenus Plurinerves. It is native to an area along the coast from the Goldfields-Esperance to the Mid West regions of Western Australia.[2]


The bushy erect pungent shrub typically grows to a height of 0.5 to 3 metres (2 to 10 ft) with branchlets that are ribbed, glabrous or sparsely appressed-puberulous with straight hairs. Stipules are present only on young fresh shoots. The trunk and branches have smooth green or brown bark. The leathery leaves[3] have phyllodes or are sessile, patent to ascending, inequilateral basally, subulate-linear, elliptic in shape and straight to recurved. They are mostly 2 to 5 centimetres (0.8 to 2.0 in) in length and 2 to 10 millimetres (0.08 to 0.39 in) wide.[4]

It blooms from July to October and produces yellow flowers. The inflorescences are simple with 1–3 per axil and peduncles which are 4 to 12 mm (0.16 to 0.47 in) long, Heads are globular with a 4 to 5 mm (0.16 to 0.20 in) diameter, containing 30-50-flowers that have a deep golden color.[4] The flowers are pollinated by many different species of insects. A moderate number of seeds will be produced during favourable seasons. The green-brown pod which forms later is a linear shape and is slightly raised over the seeds.[3] The pod is approximately 50 mm (2.0 in) long and contains between 10 and 15 of mostly viable black seeds.[5] The valves of the pod will recurve once the seed is shed, usually in December.[3]

The species was first formally described by the botanist Jacques Labillardière in 1807 as Mimosa cochlearis as part of the work Novae Hollandiae Plantarum Specimen. It was then reclassifed as Acacia cochlearis by Heinrich Wendland in 1820 as part of the work Commentatio de Acaciis aphyllis. It was reclassified in 2003 by Leslie Pedley as Racosperma cochleare then transferred back to genus Acacia in 2006. The species can be confused with Acacia melanoxylon.[6]
Distribution and habitat

A. cochlearis grows in sandy soils and is found in coastal areas on sandplains and sand dunes.[2] It grows in coastal areas from Lancelin to Israelite Bay, where it is found growing as solitary plants or in dense thickets.[5]

The shrub is sold as a suitable medium size shrub for gardens in coastal regions or areas with sandy soils.[1][7] It is also used to stabilise dune or coastal areas. A. cochlearis establishes quickly and reliably in stabilised soils. Although it is must be protected from high winds it is utilised in mixed plantings with other species such as Acacia rostellifera and Scaevola crassifolia. It is an indicator of good quality dunes as the species is vulnerable to disturbance once established.[5]

A. cochlearis can be grown from seed. The seeds should be soaked in hot water or lightly abraded with fine sandpaper prior to planting. They should be sown in free draining soil and can benefit from the addition of disease-free soil from existing plants to transfer the Rhizobium bacteria that are important in nitrogen fixation.[5] Plants require a position in full sun.[1]
See also

List of Acacia species


"Acacia cochlearis Fabaceae Rigid wattle". Geographe Community Landcare Nursery. Retrieved 1 August 2016.
"Acacia cochlearis". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
"Acacia cochlearis Commonly: Rigid Wattle" (PDF). Peppy Plants. Retrieved 1 August 2016.
"Acacia cochlearis (Labill.) H.L.Wendl., Comm. Acac. Aphyll. 3, 15 (1820)". World Wide Wattle. 12 July 2016. Retrieved 31 July 2016.
"Acacia cochlearis Rigid Wattle (Labill.) H.L.Wendl" (PDF). Plants of the West Coast. Cambridge Coastcare. Retrieved 1 August 2016.
"Acacia cochlearis (Labill.) H.L.Wendl". Atlas of Living Australia. Global Biodiversity Information Facility. Retrieved 29 September 2020.
"Acacia cochlearis". Apace WA. Archived from the original on 23 July 2016. Retrieved 1 August 2016.

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