Mammillaria giselae

My M. giselae:

A little later, but the flowers are just starting to open on this form of giselae, sometimes known as fma albiflora.

When I acquired my giselae plants, one was labelled as Clone E and was the more commonly found form, and one called Clone D which was this much paler flowered form, and one that grows a bit larger and is quite reluctant to offset.
The original seller of the plants couldn't trace his records of what these Clone D and E meant, and I eventually contacted the original discoverer of M. giselae, Jose Guadalupe Martinez Avalos, who said "In habitat, amongst Mammillaria schiedeana subsp. giselae there are some albino individuals which many authors include as a forma albiflora, but it is very common to see this colour in the field, so as far as I am concerned the classification of a albiflora form doesn't exist."
I bought them in November 1999, as small grafted plants, which wasn't very long after their first description in 1997. They nearly died in my winter 2000/2001 disaster, and all I could recover were a couple of very small offsets of each clone that was alive. These took a while to recover, and develop, and now are on their own roots.

Flowers on this are now fully open. It hasn't shown any sign of clumping yet, unlike the pink flowered form.

When you see any signs of clumping, I think you got my adress, Chris