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Rowley GD. 
“Lophophora - species and cultivars”. 
British Cactus and Succulent Society. 2006 Dec;24(4):201-9.
A review of recent literature on the genus Lophophora with its diversity of botanical classifications, and how adoption of the cultivar concept provides a simple answer to how to label plants in our collections. Illustrations of the types and standards of recognised cultivars are incorporated.
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