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Notocactus claviceps aka Parodia schumanniana.

Notocactus claviceps is distributed in southern Brazil, southern Paraguay and northeastern Argentina. It is a perennial globular to columnar plant with a diameter of about 30 cm and a height up to 1.8 meters, prefers rocky slopes.

If you want more information about this flower, just search the plant's Latin name on Google:

notocactus-claviceps

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