one of the "living rock" cacti, very slow growing and rare. It has large, grey tubercles shaped into a crown. Yellow flowers

usually five-ribbed with the body becoming elongated with few angles and dense white flock. It carries large sulphur yellow flowers with orange to scarlet centres

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

always impressive, scarlet flowers. Peanut cactus

white spines tinged pink, large light purple flowers. Hardy outside in the UK

freely offsetting erect with stems up to 20 cm tall. Yellow spines and very large violet-pink flowers

very attractive globular plants with dense silvery spines and deep purple pink flowers