Echinopsis mirabilis

Better known as Setiechinopsis mirabilis, it is a small solitary cactus. It has a green-brownish stem up to 15 cm high, with a maximum diameter of 2.5 cm. On the ribs, which are very evident, downy areoles can be seen, from which a central spine and 9-14 radial ones come out. In summer, its beautiful large white nocturnal flowers bloom, which open up only for a few hours.