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Ferocactus
http://www.desert-tropicals.com/Plants/Cactaceae/Ferocactus.html
Images and culture of many species of barrel cactus.
Ferocactus latispinus
http://www.dipbot.unict.it/orto/0962-1.html
image
Ferocactus latispinus
http://florawww.eeb.uconn.edu/acc_num/198800213.html
Ferocactus pottsii
http://www.dipbot.unict.it/orto/1039-1.html
image
Ferocactus stainesii
http://florawww.eeb.uconn.edu/acc_num/198502309.html