Mammillaria bocasana Poselg.

Densely clustering, body globular 4-5 cm wide. Axils bare or with long woolly. 1-4 yellowish-brown central spines 5-12 mm long, 1-2 hooked, numerous (25-30) hair-like white radial spines 8-20 mm long. Flowers pale yellow, pinkish or white.

C Mexico

var. splendens (a name of no botanical standing) and var. multihamata Schelle refer to variants with radial spines very densely distributed.

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.