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The Acanthocalycium rhodotrichum belongs to Cactaceae (the Cactus family). It is a treelike cuctus that is distributed in South America from Bolivia to Brazil, Paraguay, Uruguay, and Argentina. It grows mainly in the subtropics and is 30-80 cm tall and about 12 cm in diameter. It has 8 to 18 ribs, one central spine and 4 to 8 marginal spines. In summer, it produces large white flowers on long scapes.
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