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Commonly cultivated for their showy inflorescences are the arum lilies, or callas (genus Zantedeschia ), native to tropical and S Africa; the common florists' white-spathed calla lily is Z. aethiopica. The wild calla, or water arum ( Calla palustris ), of E North America and other northern regions is similar to the calla lily but smaller and is not usually cultivated.
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