It is a small solitary cactus with a radially segmented body showing the typical habitus of this flat, globular genus. The cephalium, which stays just as flat, is covered by the flowers that come out of it. These cacti are not easy to cultivate, but when grown to maturity, however, they possess an exotic look shared by no other cacti, and they’ll generally attract a lot of attention. D. horstii is really distinctive and obviously deserving of specific rank.