Acacia obtusifolia is an upright or spreading perennial tree, which grows from 1.5m to 8m in height and is native to Australia.

A. obtusifolia can be distinguished by having phyllode margins which are resinous, usually blooming later in the year and with paler flowers than A.

These populations avoid the valley floors and occur mainly on sandstone ridges well above the frost line.

[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.

Similarly, late 90s internet researchers have figures ranging from 0.4% to 0.5% in the dried material, noting there to be some variability.