1. barrel cactus, cactus

usage: a cactus of the genus Ferocactus: unbranched barrel-shaped cactus having deep ribs with numerous spines and usually large funnel-shaped flowers followed by dry fruits

2. echinocactus, barrel cactus, cactus

usage: any cactus of the genus Echinocactus; strongly ribbed and very spiny; southwestern United States to Brazil

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