Armatocereus
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Armatocereus riomajensis
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Armatocereus (from Latin armatus, "armed" and cereus, "pliant/soft") is a genus of mostly tree-like cacti from South America (Colombia, Ecuador to Peru). These species have a conspicuous constriction at the end of the annual growth. The flowers are mostly white, with more or less spiny ovary. The fruits are mostly spiny.