Mammillaria hernandezii Glass & R.A.Foster

Solitary, body globular, to 4.5 cm wide. Tubercles prominent, pyramidal. Axils woolly. Central spines lacking. Radial spines 17-25, 1.2-2.2 mm long, white. Flowers pale magenta, 2 cm long and wide.

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.