Mammillaria guillauminiana Backeb.

Freely clustering, body globular, crown depressed or flat, to 5 cm wide. Tubercles prominent, conical. Axils naked. Central spines 4-5, 6-7 mm long, lower spine hooked and reddish-brown. Radial spines 30-32, 6-7 mm long, bristle-like. Flowers pink, 1 cm long and wide. Fruit white. [M. mercadensis var. guillauminiana (Backeb.) Repp.]


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.