Solitary, body depressed globular, 10-15 cm wide. Axils woolly. Tubercles angled, prominent. Central spines 1-4, 10-20 mm long, brown. Radial spines 11-13, 4-12 mm long, dark brown, needle-like. Flowers carmine, 4 cm long and wide. Fruit dull red.

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. (as Mammillaria rubrograndis)