Acacia obtusifolia

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

Stiff leaf wattle
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Fabales
Family:	Fabaceae
Subfamily:	Caesalpinioideae
Clade:	Mimosoid clade
Genus:	Acacia
Species:	A. obtusifolia
Binomial name
Acacia obtusifolia A.Cunn.
Range of Acacia obtusifolia
Synonyms[1]
Acacia intertexta DC. Acacia longifolia (Andrews) Willd. var. obtusifolia (A.Cunn.) Seeman Racosperma obtusifolium (A. Cunn.) Pedley

Description

Acacia obtusifolia is an upright or spreading perennial tree, which grows from 1.5m to 8m in height and is native to Australia. It is closely related to Acacia longifolia. A. obtusifolia can be distinguished by having phyllode margins which are resinous, usually blooming later in the year and with paler flowers than A. longifolia.^[2] It flowers usually from December through February. Some populations of A. 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.

Phytochemicals

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

Despite the lack of formal scientific publishing of its phytochemistry, several chromatographs show 0.3% alkaloid consisting of 2:1 N-Methyltryptamine, dimethyltryptamine (DMT), plus trace betacarbolines,^[4] while another found gramine. It is highly variable in composition, sometimes devoid of tryptamines. There have also been findings of 5-MeO-DMT, DMT and bufotenine.^[5] Some internet sources claim a 0.45% average dimethyltryptamine in the bark and 0.3% in the dried young leaves. Similarly, late 90s internet researchers have figures ranging from 0.4% to 0.5% in the dried material, noting there to be some variability.^[6]