Cleistocactus sp. cactus. The Cleistocactus cacti often form the spiny columns seen here

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Photo credit: © VAUGHAN FLEMING/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: angiosperm, angiosperms, arid-adapted, biological, biology, botanical, botany, cacti, cactus, cleistocactus, columnar, columns, flora, horticultural, horticulture, nature, plant, sp, spiky, spiny, succulent