Some of the Mammillaria species we've encountered:
Mammillaria campotricha
Mammillaria compressa
Mammillaria dasyacantha
Mammillaria dioica
Mammillaria elongata
Mammillaria formosa
Mammillaria grahamii
Mammillaria hemispherica
Mammillaria heyderi in horticulture
Mammillaria heyderi in South Texas
Mammillaria heyderi in Trans-Pecos Texas
Mammillaria lasiacantha
Mammillaria lenta
Mammillaria magnimamma
Mammillaria meiacantha
Mammillaria pottsii
Mammillaria sphaerica
Additional Mammillarias that are presently lacking good IDs:
Possibly a Mammillaria. Growing with an L. diffusa population in Queretaro.
Mammillaria growing with an L. diffusa population near Higuerillas, in southern Queretaro.
The one on the left is maybe a dixanthocentron but details are not sharp enough for certainty as two other Mexican species look sort of similar.
Mammillaria growing with an L. williamsii population in Nuevo Leon.
Might possibly be M. sanchez-mejorada but the details are not sharp enough for me to tell.
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