Body more or less globular, 5-10 cm wide with (6-)8(-10) flat ribs with distinct intervening furrows. Areoles prominent, spineless. Flowers yellow, reddish in centre, 4-6.5 cm wide.

NE Mexico, SE North America (extremely rare in wild)

This species almost extinct in the wild.

Many of the plants available in cultivation under this name are probably of hybrid origin.

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.