Another Mammillaria

This is Mammillaria zeilmanniana, but the white-flowered form this time instead of the pink that I showed before.



What's interesting about this plant is that it has spination like the pink-flowered Mammillaria zeilmanniana, but flowers like the plumose-spined Mammillaria duwei.



M. zeilmanniana and M. duwei are both now considered subspecies of M. crinita. When you look at the extremes it's hard to believe that they are the same species, but when you consider the whole gradient of forms, it becomes a little more visible.