Turbinicarpus valdezianus is a dwarf, globular cactus with a stem completely divided into angled tubercles and obscured by dense spines. This species has 30 or more distinctive ‘radial’ spines, which are white and feathery and measure up to 0.2 centimetres in length. The radial spines spread out horizontally, forming small ‘umbrellas’ on the tips of the tubercles. Unlike some other species, Turbinicarpus valdezianus lacks central spines (2).
This cactus may be confused with other small cacti with dense, feathery spines, such as Mammillaria lasiacantha, Mammillaria theresae and Mammillaria sanchez-mejoradae. However, the flowers of Turbinicarpus valdezianus are positioned at the top of the stem, rather than on the sides as in Mammillaria species (2).
- Diameter: up to 2.5 cm (2)