Mammillaria formosa Scheidw.

Solitary, eventually clustering, body globular, crown depressed or flat, to 10 cm wide, with milky sap. Tubercles prominent. Axils woolly. Central spines 4-6(-7), to 8 mm long, needle-like, pinkish, tips blackish. Radial spines 20-22, 3-6 mm long, whitish. Flowers pale pink with reddish stripe, 1 cm long, 1.5 cm wide. Fruit red.

C Mexico

Source: Thompson, A, ; Forbes, S.; Spencer, R. (1997). Cactaceae. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 2. Flowering plants. Dicotyledons. Part 1. The identification of garden and cultivated plants. University of New South Wales Press.

kingdom Plantae
phylum   Tracheophyta
class    Magnoliopsida
superorder     Caryophyllanae
order      Caryophyllales
family       Cactaceae
genus        Mammillaria Haw.