Parodia subterranea (also found in cultivation as Notocactus occultus) is an amazing white-topped cactus species from Bolivia that reputedly grows almost completely hidden below the soil. The flower colour is usually red, but can be quite variable.
Dark green body, yellowish spines and a small yellowish flower, free flowering. Parodia comarapana is strictly endemic to a small area in Santa Cruz and Florida in the north of Comarapa, Bolivia.