spherical, oblong or club-shaped body, with tubercles, white to straw-coloured spines with darker central spines, greenish-yellow flowers

called the "Bishop's Cap Cactus" because of its 5 angular ribs. It is a very attractive plant, closely spotted with white and completely spineless. It has large yellow flowers

appealing species with long curving grey and black spines, large yellow flowers

small, spherical and deep green to olive-green, sometimes with a reddish overlay. Bristly with fine white spines and a longer central spine, and bearing yellow flowers

grey-green plants up to 8 cm high with pure white spines. Large yellow flowers with a red throat, becoming pink after the first day. Has one of the largest flowers of any plant in this genus

clumping species with large pinkish-red flowers

globular type, up to 7cm tall, with beautiful white spines. Flowers in shades of pink. Choice