Mammillaria hahniana finally blooming!

I think this is Mammillaria hahniana (maybe) ssp woodsii.





I remember buying this small globe at the JHS Flower Show about three years ago just because it looked like something I didn't have. Never mind that I didn't know what it was, but eventually I got a tentative ID from one of the Forums that it might be Mammillaria hahniana.

Although it has been quietly growing, I was surprised to see buds form earlier this year.

Finally, the display!

And, a closer look at the flower.