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.