Mammillaria.
Classic texts: Sturtevant 1919.
Escobaria vivipara (Nutt.) Buxb.
Engl.: spinystar, Arizona spinystar, ball cactus, Bisbee spinystar.
Bot. syn.: Coryphantha arizonica (Engelm.) Britt. & Rose, Mammillaria vivipara Haw.
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Henriette's herbal is one of the oldest and largest herbal medicine sites on the net. It's been online since 1995, and is run by Henriette Kress, a herbalist in Helsinki, Finland.