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crab cactus, Thanksgiving cactus, Zygocactus truncatus, Schlumbergera truncatus | South American jointed cactus with usually red flowers; often cultivated as a houseplant; South American jointed cactus with usually red flowers; often cultivated as a houseplant; sometimes classified as genus Schlumbergera ❲Zygocactus truncatus, Schlumbergera truncatus❳ |