(Benth.) Seigler & Ebinger
Vachellia rigidula, commonly known as Blackbrush Acacia or Chaparro Prieto, and also known as Acacia rigidula, is a species of shrub or small tree in the legume family, Fabaceae. Its native range stretches from Texas in the United States south to central Mexico. This perennial is not listed as being threatened. It reaches a height of 5–15 feet (1.5–4.6 m). Blackbrush Acacia grows on limestone hillsides and canyons.
A phytochemical study of V. rigidula by workers at the Texas A & M University Agricultural Research and Extension Center at Uvalde, TX, reported the presence of over forty alkaloids, including low amounts (up to ~ 15 ppm) of several amphetamines that had previously been found by the same research group in the related species Senegalia berlandieri, but which otherwise are known only as products of laboratory synthesis. Compounds found in the highest concentrations (ranging from a few hundred to a few thousand ppm) were phenethylamine, N-methylphenethylamine, tyramine and N-methyltyramine. Other notable compounds reported were N,N-dimethyltryptamine, mescaline, and nicotine, although these were found in low concentrations (e.g. mescaline at 3-28 ppm).
The presence of such an unprecedented chemical range of psychoactive compounds, including ones not previously found in nature, in a single plant species has led to the suggestion that some of these findings may have resulted from cross-contamination or were possibly artifacts of the analytical technique.
Blackbrush Acacia is used in weight loss dietary supplements because of its adrenergic amine content. These compounds are claimed to stimulate beta-receptors to increase lipolysis and metabolic rate and decrease appetite.
- "Acacia rigidula - Benth. Blackbrush Acacia". NatureServe Explorer. NatureServe. Retrieved 2010-10-17.
- "Taxon: Acacia rigidula Benth.". Germplasm Resources Information Network. United States Department of Agriculture. 1999-09-09. Retrieved 2010-10-17.
- ILDIS LegumeWeb
- "Acacia rigidula Benth.". Native Plant Database. Lady Bird Johnson Wildflower Center. Retrieved 2009-06-30.
- "Blackbrush Acacia, Chaparro Prieto, Catclaw, Gavia". Texas Native Plants Database. Texas A&M University. Retrieved 2009-06-30.
- B. A. Clement, C. M. Goff, and T.D. A. Forbes (1998). "Toxic amines and alkaloids from Acacia rigidula." Phytochem. 49 1377-1380.
- B.A. Clement, C. M. Goff and T. D. A. Forbes (1997). "Toxic amines and alkaloids from Acacia berlandieri." Phytochem. 46 249-254.
- "Acacias and Natural Amphetamine". Ask Dr. Shulgin Online. Center for Cognitive Liberty & Ethics. 2001-09-26.
- WO application 2006099274, Jared R. Wheat, "Dietary Supplement and Method of Using Same", published 2006-09-14
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