Echinocactus.
Botanical name:
Classic texts: Sturtevant 1919.
Echinocactus horizonthalonius Lem.
Engl.: devilshead.
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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.