Mammillaria meiacantha Engelm., Cactaceae: See Mammillaria heyderi Muehlenpf. var. meiacantha (Engelm.) L. D. Benson.
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.
http://www.henriettes-herb.com - Copyright 1995–2020 Henriette Kress.