Acacia mearnsii De Wild. - syn.Acacia decurrens var. mollis; Acacia mollissima auct.; Racosperma mearnsii (De Wild.) Pedley - Fabaceae
black wattle, tan wattle, Australian acacia, Australische Akazie, Gerberakazie, Schwarzholz-Akazie
Evergreen shrub or tree, up to 15m tall, native to Australia, naturalized and cultivated elsewhere; branchlets gray-white tomentose; young leaves golden tomentose, mature leaves gray pubescent, pinnae 6-30 pairs, leaflets 10-68 pairs, dense, linear; flowers yellowish or white; legume black, oblong, flat, 5-10cm long, slightly constricted between seeds, pubescent; seeds black, shiny, ovoid.
„This species is grown for its tannins and as a honey plant.“
„This plant is now known as one of the worst invasive species in the world.“
„The tannin compounds extracted from the bark of Acacia mearnsii are commonly used in the production of soft leather. A range of other products, such as resins, thinners and adhesives, can also be made from bark extracts… Acacia mearnsii has some known medical applications, such as its use as a styptic or astringent.“
[100 of the World's Worst Invasive Alien Species. Global Invasive Species Database., retrieved 2015-05-03]
The activity of A.mearnsii bark extracts against some enteric organisms like E.coli may provide an explanation to the ethnomedicinal use of A.mearnsii in the treatment of gastro-intestinal diseases like diarrhoea and
stomach ache (like tannin-rich Senegalia catechu extracts).
[Antibacterial activity of the stem bark extracts of Acacia mearnsii De Wild., Mbolekwa, B.N., Kambizi, L., Songca, S.P., Oluwafemi, O.S., African Journal of Microbiology Research, Vol.8(2), 2014, 211-216]
picture source: Forest Starr and Kim Starr CC BY-SA 3.0