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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 trachycarpa

Acacia trachycarpa E.Pritz., Bot. Jahrb. Syst. 35: 308. 1904

Acacia gonocarpa var. lasiocalyx F.Muell.
Racosperma trachycarpum (E.Pritz.) Pedley

Native distribution areas:
Acacia trachycarpa

Continental: Australasia
Regional: Australia
Western Australia

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

Diels, F.L. & Pritzel, E.G. 1904. Fragmenta Phytographiae Australiae occidentalis. Beiträge zur Kenntnis der Pflanzen Westaustraliens, ihrer Verbreitung und ihrer Lebensverhältnisse. Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie 35: 55–662. BHL Reference page. : 35(2-3): 308


Govaerts, R. et al. 2020. Acacia trachycarpa in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the internet. Accessed: 2020 Aug 16. Reference page.
International Plant Names Index. 2019. Acacia trachycarpa. Published online. Accessed: Aug 16 2019. 2019. Acacia trachycarpa. Missouri Botanical Garden. Published on the internet. Accessed: 2019 Aug 16.
Catalogue of Life: 2020 Annual Checklist
Acacia trachycarpa – Taxon details on World Wide Wattle.
USDA, ARS, Germplasm Resources Information Network. Acacia trachycarpa in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 09-Oct-10.

Vernacular names
English: minni ritchi, curly-bark tree, sweet-scented minni ritchi, Pilbara minni ritch

Acacia trachycarpa, commonly known as minni ritchi, curly-bark tree, sweet-scented minni ritchi[1] or Pilbara minni ritchi,[2] is a shrub or tree belonging to the genus Acacia and the subgenus Juliflorae that is native to arid and semi-arid areas of Western Australia.


The spreading shrub or tree has minni ritchi style bark typically grows to a height of 1 to 4 metres (3 to 13 ft) but can reach as high as 6 m (20 ft).[3] The crown is often spreading but sometimes flat-topped. The bark is a burgundy red to reddish-brown colour which peels off the trunk and branches in thin strips that curl backward. The narrowly linear shaped phyllodes have a length of 4 to 10 cm (1.6 to 3.9 in) and a width of 0.8 to 2 mm (0.031 to 0.079 in) in the typical variant which become longer and wider for the dwarf variant. The dull green phyllodes are normally soft and delicate and can be straight or shallowly curved or wavy. They have three or more parallel longitudinal nerves per face but normally only the central nerve is apparent. The apex narrows to a fine and pungent point.[1] It blooms from April to October producing yellow flowers.[3] The simple inflorescences simple form as a flower-spike that is 9 to 30 cm (3.5 to 11.8 in) in length. The seed pods that form later have a narrowly oblong to linear shape. the pods are flat with straight sides with little constriction between seeds. The resinous, sticky, shiny brown pods have a length of 7 to 11 cm (2.8 to 4.3 in) and a width of 7 to 12 mm (0.28 to 0.47 in) and are strongly an commonly irregularly curved. The seeds within are arranged obliquely and have a spherical to obloid shape. The shiny dark brown to black seeds are 5 to 8 mm (0.20 to 0.31 in) in length and 4 to 7 mm (0.16 to 0.28 in) wide with a dull yellow to brown depression at the centre.[1]

The species was first formally described in 1904 by the botanist Ernst Georg Pritzel as part of the work between Pritzel and Ludwig Diels Fragmenta Phytographiae Australiae occidentalis. Beitrage zur Kenntnis der Pflanzen Westaustraliens, ihrer Verbreitung und ihrer Lebensverhaltnisse as published in Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie. It was reclassified as Racosperma trachycarpum in 2003 by Leslie Pedley then transferred back to the genus Acacia in 2006. The only other synonym is Acacia gonocarpa var. lasiocalyx.[4] The specific epithet is taken from the Greek word trachys meaning rough and carpos meaning fruit in reference to rough texture of the seed pods.[1]

It is endemic to an area in the Kimberley, Goldfields and Pilbara regions of Western Australia where it is usually found along creeks and rivers growing in stony sandy soils.[3] The population is mostly found to the west of the Hamersley Range with the distribution becoming more scattered in the Kimberley region and eastwards toward the border. It will sometimes forming thickets on coastal pindan sandplains in the Pilbara region. It is commonly part of the Acacia pyrifolia and Acacia coriacea subsp. pendens woodland communities on alluvial plains and washes.[1]


The plant is available commercially in seed form or as tube stock seedlings.[5] It is known as a moderately fast growing multi-stemmed shrub or tree that is drought tolerant and grows well in non-saline and well drained soils in a full sun to part shade position.[5] Seeds need to be pretreated with hot water is recommended prior to planting.[6]
See also

List of Acacia species


"Acacia trachycarpa". World Wide Wattle. Department of Environment and Conservation. 2010. Retrieved 22 January 2019.
"Acacia trachycarpa E.Pritz". Wattles - Acacias of Australia. Department of the Environment and Energy. Retrieved 22 January 2019.
"Acacia trachycarpa". FloraBase. Western Australian Government Department of Parks and Wildlife.
"Acacia trachycarpa E.Pritz". Atlas of Living Australia. Global Biodiversity Information Facility. Retrieved 22 January 2019.
"Acacia trachycarpa Sweet Scented Minni-Ritchi". Australian Seed. Retrieved 22 January 2019.
"Acacia trachycarpa Sweet Scented Minni-Ritchi". Nindethana Seeds. Retrieved 22 January 2019.

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