Solitary, body depressed globular, to 12 cm wide, with milky sap. Tubercles prominent, pyramidal. Axils woolly. Central spine solitary, to 3 cm, black fad­ing to brownish grey. Radial spines 6-9, unequal, the lower 6-22 mm exceeding the others, black. Flowers deep pink, 2 cm long and wide. Fruit pinkish.

N 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.