Echinomastus (meaning "spiny breast") was a formerly recognized genus of cacti. , it is accepted as a synonym of Sclerocactus. Species formerly placed in the genus are native to the southwestern United States and Mexico.
Former species Formerly accepted species include: Echinomastus erectocentrus → Sclerocactus johnsonii subsp. erectocentrus Echinomastus johnsonii → Sclerocactus johnsonii Echinomastus mariposensis → Sclerocactus mariposensis
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