As I have said in previous posts, I used to specialize in cacti, especially tropical spp. This one has been one of my special "folk" in that it refused to secumb to the mites as many others did. This guy has not only been the stalwart of my old collection, but when I purchased it from B&B Cactus Farm in Tucson in the late 1980's was the size of one of the little pups you see around the base! This year the pups are blooming along with Mom.
Oh, yeah, this is Parodia mairanana
The pup to the left has at least one bud forming! These guys are full sun only. When just bright light is used, they won't bloom. I moved this into full sun outside an hour before the shot to get the flower out.