Mammillaria herrerae Werderm.

Solitary or clustering, body globular or eventually elongate, to 3 cm wide, without milky sap. Tubercles obscure. Axils bare. Central spines lacking. Radial spines about 100, unequal, to 1.5 mm long, white, bristle-like. Flowers pale pink, 2.5 cm long and wide. Fruit whitish.

EC 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.