Body generally clustering, to 15 cm tall and 5 cm wide. Ribs 7-14. Tubercles with areoles close together and with nectaries. Central spines 1 or 0, when present to 5 cm long. Radial spines 6-20 to 7 mm long. Flower 2-4.5 cm wide, mostly yellow to violet. Fruit greenish, dry, opening by basal pore.

CE 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.