Coryphantha elephantidens

Is up to 25 cm high with a deep green body and conspicuous pale spines. The carmine to white flowers, always with red throat, appear in the second half of summer. C. elephantidens comes from the Mexican state of Morelos. The similar, yellow-flowered C. bumamma ranges to the south and west. Both species grow in black soil rich in humus, on limestone in lush grass - in places with profuse summer rainfall. They are easy to cultivate, requiring a great deal of nutrients and watering in summer, in winter surviving in a completely dry environment at about 10°C. They are suitable for beginners and growers with modest conditions.

Coryphantha macromeris

Is a soft-fleshed plant with prominent spines and grows in clumps. It frequents dry situations and it is sensitive to watering. The large hairy flowers appear at the end of summer and last only for 1 to 2 days. It occurs int he south of the USA, in western Texas and mainly in northern Mexico.

Coryphantha clava

This stubbly cactus has yellow to brown spines that fade to off-white. Clumping with age, it bears golden flowers only when mature. The areoles exude a nectar-like secretion on which mould grows; regular spraying with water in summer and autumn and good ventilation help to avoid this.

H 38 cm (15 in), S 60cm (2 ft). Min. 5°C (41°F).