Acacia simplex is a perennial climbing tree native to islands in the western part of the Pacific Ocean as far east as Savaiʻi.

[3] There is no common English name, but it is called tatakia in Fiji, tatagia in Samoa, tātāngia in Tonga and Martaoui in New-Caledonia The tree is used as a toxin in fishing.

It incapacitates the fish, but it is apparently not harmful to people.

[4] Total alkaloids 3.6% of which 40% N-methyltryptamine, 22.5% N,N-dimethyltryptamine, 12.7% 2-methyl-1,2,3,4-tetrahydro-β-carboline.

[5] Total alkaloids 0.11%, of which N-methyltryptamine is 26.3%, 6.2% N,N-dimethyltryptamine, 5.8% 2-methyl-1,2,3,4-tetrahyrdo-β-carboline, 1.6% N,N-formylmethyltryptamine.