Mammillaria carmenae CastaƱeda

Freely clustering, body globular or elongate at maturity 3-4 cm wide. Axils with wool and bristles. Central spines lacking, more than 100 white or yellow, pubescent radial spines to 5 mm. Flowers white 11 mm long and wide. Fruit greenish.

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.