Mammillaria for ID

[ralphrmartin]

I acquired this as Mammillaria longiflora, and while the body looks rather like it, the flowers are far too small.

Can anyone tell me what it is, please?

[Cidermanrolls]

Hi Ralph
My immediate thought was Mam mercadensis, but I’d need to think longer.
I expect Herr Reppenhagen would have said Mam longiflora fa breviflora.

[Tony R]

It matches what I have grown in the past as M. jaliscana which is closely related to M. mercadensis.

[Chris43]

M jaliscana in my book. M. mercadensis has yellow flowers only, I think, whereas you can find M. jaliscana in both pink and yellow flowered forms.

[ralphrmartin]

Thanks for that, everyone. I'm off to print a new label...