Mammillaria longimamma

Mammillaria longimamma is a species of cactus from the Mexican states of Hidalgo and Queretaro. It belongs to the large genus Mammillaria in the cactus family, Cactaceae, order Caryophyllales, and the GBIF backbone lists it as an accepted species under the authority abbreviation DC. Its best documented trait is chemical: the plant contains a distinctive group of alkaloids named after it, including longimammidine, longimammine, longimammamine, longimammatine and longimammosine, together with normacromerine and synephrine. All of these are phenethylamines, in the cyclised tetrahydroisoquinoline form or as beta-substituted phenethylamines. Despite that chemistry, the species is not known to have any hallucinogenic effect on humans, so it should not be confused with the psychoactive cacti of other genera.