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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 obtusifolia

Acacia obtusifolia A.Cunn., 1825

Acacia intertexta Sieber ex DC.
Acacia longifolia var. obtusifolia (A.Cunn.) Seem.
Racosperma obtusifolium (A.Cunn.) Pedley

Native distribution areas:
Acacia obtusifolia

Continental: Australasia
Regional: Australia
New South Wales, Queensland, Victoria

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

Cunningham, A., 1825. in B. Field, Geographical Memoirs on New South Wales 345.


Govaerts, R. et al. 2020. Acacia obtusifolia in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2020 Aug 10. Reference page.
International Plant Names Index. 2019. Acacia obtusifolia. Published online. Accessed: Aug 10 2019. 2019. Acacia obtusifolia. Missouri Botanical Garden. Published online. Accessed: 10 Aug 2019.
Catalogue of Life: 2021 Annual Checklist
Acacia obtusifolia – Taxon details on World Wide Wattle.
USDA, ARS, Germplasm Resources Information Network. Acacia obtusifolia in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 09-Oct-10.

Vernacular names
English: stiff-leaf wattle, blunt-leaf wattle

Acacia obtusifolia, commonly known as stiff-leaf wattle or blunt-leaf wattle, is a perennial tree in subfamily Mimosoideae of family Fabaceae.


Acacia obtusifolia is an upright or spreading perennial tree which grows from 1.5m to 8m in height and it is native to Australia. It is closely related to Acacia longifolia. Acacia obtusifolia can be distinguished by it having phyllode margins which are resinous, it usually blooms later in the year and it has paler flowers than Acacia longifolia.[2] It flowers usually from December through February. Some populations of Acacia obtusifolia can survive winters to −6 °C and possibly a light snow, however plants from populations in areas that are frost free such as the coastal ranges of Northern NSW are susceptible to cold and will be killed by frosts lower than −3 °C. These populations avoid the valley floors and occur mainly on sandstone ridges well above the frost line.

Teracacidin, a flavan-3,4-diol, can be isolated from A. obtusifolia heartwood.[3]

Net lore indicates a 0.45% average dimethyltryptamine in the bark and 0.3% in the dried young leaves. Similarly, Mulga states figures ranging from 0.4% to 0.5% in the dried bark, noting there to be some variability.[4] No formal scientific publishing of phytochemistry, several chromatographs show 0.3% alkaloid consisting 2:1 monomethyltryptamine, dimethyltryptamine, plus trace betacarbolines; another found additional 5 methoxydimethyltryptamine and gramine. Is highly variable in composition, sometimes devoid of tryptamines (Ref: Nen in EntheogenReview (journal) 1996); privately commissioned test at Southern Cross University, NSW, Australia, 2000. Also findings of 5-MeO-DMT, DMT and bufotenine.[5]

ILDIS LegumeWeb
PlantNET Flora Online
Flavan derivatives. XIX. Teracacidin and isoteracacidin from Acacia obtusifolia and Acacia maidenii heartwoods; Phenolic hydroxylation patterns of heartwood flavonoids characteristic of sections and subsections of the genus Acacia. JW Clark-Lewis and I Dainis, Australian Journal of Chemistry, 20(10), pp. 2191–2198, doi:10.1071/CH9672191
Acacia and Entheogenic Tryptamines Archived 1 April 2009 at the Wayback Machine
Poland National Herbarium

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