Turbinicarpus alonsoi is a solitary plant with a flattened, rounded body to about 2-3 inches in diameter. Most of the body is subterranean, but the aboveground part has elongated, triangular tubercles reminiscent of a miniature Ariocarpus retusus. Beautiful, intense, cherry-red to magenta pink flowers appear from spring through fall. This exquisite little plant is native to Guanajuato state in central Mexico, and grows on steep slate slopes (say that 3 times fast) and is found with other intriguing plants such as: Mammillaria schiedeana, Strombocactus disciformis ssp. esperanzae and Astrophytum ornatum. Plants have been hardy to at least 21 degrees F in Tucson.