Hi, I have had this mammilaria for a few years and it always flowers early on in the year with a halo of pink flowers. You can just see the buds for the next ring of flowers above the open ones. There was no identification when I bought it but I believe it to be a mammilaria spinossima but there are loads of subspecies. Its currently 11 inches tall and 2.5 inches in diameter at the base.
Anyone any idea on which subspecies it is or even if it is a mammilaria spinossima?
I've no idea what the one to the left of it either but its not a mammilaria.