I think this name basically exists in a grey zone.
If it was horticultural you would name it differently to if it was a wild plant.
Still regardless of the naming, it is a nice plant. I have seed of this plant and your photo is encouraging
me to put in a late sowing!

Nice!
I think krainziana is supposed to be of horticultural origin?
So it does not have to have a formal name for the different forms?

Fortunately your plant's flowers will open without a lot of direct sun.

Hopefully the classification is stable now but there might be a few surprises yet.

Most of my plants are two weeks ahead judging from your A. 'celebration' and A. hoffmannii.
My plants are just finishing their first flush of flowers.

What hybrids are you growing?

Do you mean the Tesco moler clay cat litter? They stopped that a while ago.
Kittyfriend Pink Cat Litter seems to be the current one- but this is only available from some Pet stores for some reason.

Rebutia senilis var. lilacinorosea, nice plant to start off your Rebutia shelf flowering.

The flowers from the plant on the left looks like the flowers on the named parent?

Nice plant! Looks like it is wearing a warm winter coat ready for the summer.

Looks great. I'm starting to worry that those small seedlings I have will soon each grow into a very large plant.
Hopefully it'll take many years!