A highly variable cactus that is native to Argentina and Bolivia. The (usually) solitary stem can grow to as high as 20 cm with a width up to 10 cm. Its flowers bloom in Summertime and may be yellow, red, or orange in colour. It enjoys a sunny position in well-draining soil, with regular watering during Summer. Keep fairly dry in Winter. Protect from extreme heat. It is tolerant of light frost if dry.