Astrophytum Myriostigma Quadricostatum
This is a popular variation of the Bishops Cap cactus. This cactus is unique because it grows with four ribs rather than five ribs like the standard A. myriostigma.
Astrophytum myriostigma is a spineless succulent plant. Quadrangular to almost spherical, the plants become shortly columnar with age. The stems are smooth and can be over 90 cm tall and 5-10 (-20) cm in diameter. A. myriostigma quadricostatum flowers independently of day length, flowering intermittently throughout the warm months from the end of winter to the start of autumn.