Low, clumping. Segments round to obovate, to about 10 cm long, blue-green. Spines 5-10 to 5 cm long, cylindrical, bent back. Flowers 4-8 cm wide, yellow. Fruit dry.

W North America

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.