We are not sure which cactus this is. We picked it up as Rebutia species but we are not cactologists so trying to figure out which species this is the closest we came to it was R. fiebrigii v. kieslingii, although several forms of R. pygmaea are also close. The flowers are certainly small. This plant is a low growing type with a short columnar body that leans over a little. Flowers are orange.