Discocactus is a genus of tropical cactus. The name comes from the ancient Greek "diskos" (disc) because of its shape. Discocactus plants are endemic to southern Brazil, eastern Bolivia, and northern Paraguay. These species are in the risk of extinction in the wild.
The plants have a slightly flattened spherical shape. Areoles bear sharp spines. At the apex of the adult plants, appeared a woolish cephalium white ot z little bit yellow or grey. On the sides of the cephalium appear white nocturnous flowers. Fruits are pink or red. They contains black seeds.