Mammillaria spinosissima cv.'Un Pico' never formally described.
Growth Habits: Solitary or slowly clumping.
Scientific name: Mammillaria spinosissima cv.'Un Pico'
Common names: None known.
Synonym: Mammillaria spinosissima v unispina, Mammillaria spinosissima cv. 'one spine'
Etymology: Mammillaria From the Latin word mammilla, meaning nipple or teat.
spinosissima,The specific name implies: "the spiniest"
Un Pico, one spine.
Origin: Nursery produced cultivar.
Light: As much light as it will take without burning to encourage spine growth.
Compost: A free draining standard cactus mix.
Water: Regular water in spring to autumn allowing soil to dry between waterings, keep dry in winter.
Flower: Pinkish red.
Min temp: Down to about -2 C.
Cultivation: Not a difficult plant to grow, treat as any other easy Mammillaria.
References. http://www.cactus-art.biz
Comments. A stable genetic mutation of Mammillaria spinosissima ssp spinosissima with only one spine on each areole.
Image showing flowers.