- Cleistocactus hyalacanthus
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Cleistocactus hyalacanthus 
Scientific classification Kingdom: Plantae (unranked): Angiosperms (unranked): Eudicots (unranked): Core eudicots Order: Caryophyllales Family: Cactaceae Subfamily: Cactoideae Tribe: Trichocereeae Genus: Cleistocactus Species: C. hyalacanthus Binomial name Cleistocactus hyalacanthus Cleistocactus hyalacanthus is a species of columnar cactus in the genus Cleistocactus. The name comes from the Greek kleistos meaning closed because the flowers hardly open.
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