Aztekium is a genus of two species of small globular cacti in the family Cactaceae, order Caryophyllales. Endemic to the Mexican states of Nuevo León and Tamaulipas, the genus was discovered in 1929 by F. Ritter in Rayones, Nuevo León, and was long considered monotypic with only Aztekium ritteri. A second species, Aztekium hintonii, was discovered by George S. Hinton in 1991 in Galeana, Nuevo León.
Aztekium ritteri is a diminutive plant, typically around 20 mm wide, with 9 to 11 ribs characterised by distinct transverse wrinkles. Its body ranges from pale green to grayish-green, with a white woolly center. Flowers are small — under 10 mm wide — with white petals and pinkish sepals, and the plant bears pinkish, berry-like fruit. A. hintonii is considerably larger, reaching up to 10 cm in diameter, with 10 to 18 grooved ribs and showy magenta flowers up to 3 cm across. It grows exclusively on gypsum substrates.
Both species are among the slowest-growing cacti known, taking approximately two years to reach just 3 mm in diameter. They are typically propagated from seed. The genus name honours the Aztec people, inspired by the resemblance of the plants' ribbed and sculptural forms to Aztec stone carvings.
Etymology
The name Aztekium is dedicated to the Aztec people of Mexico, reflecting the perceived resemblance between the deeply ribbed and wrinkled surface of these cacti and certain Aztec stone sculptures.
Distribution
Aztekium is endemic to the Mexican states of Nuevo León and Tamaulipas. A. ritteri grows in Rayones and surrounding areas; A. hintonii is known from Galeana. Populations of A. hintonii are estimated in the tens of millions across largely intact habitat, while A. ritteri has been reduced by decades of collection pressure, though millions of plants remain in the wild.
Cultivation
Both species are exceptionally slow-growing, requiring approximately two years to reach 3 mm in diameter. They are most reliably propagated from seed. In cultivation they demand excellent drainage, full sun, and protection from frost — conditions that mirror their rocky, arid native habitat.
Conservation
Aztekium ritteri has experienced habitat destruction and decades of collection pressure, though wild populations still number in the millions. A. hintonii, discovered only in 1991, occupies mostly pristine range with an estimated population in the tens of millions. Both species are subject to CITES protections as members of Cactaceae.
