Mammillaria hahniana, the old lady cactus, is a species of flowering plant in the family Cactaceae, native to central Mexico. It grows to 25 cm tall by 50 cm broad. The solitary spherical stems, 12 cm in diameter, are covered in white down and white spines.
Scientific name: Mammillaria hahniana
Conservation status: Near Threatened (Population decreasing)
Family: Cactaceae