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16 370138 Echinocereus polyacanthus Engelm. Engelm. [Echinocereus acifer (Otto) Lemaire in Forster]
K.M. Schumann, M Gürke, F. Vaupel, Bl. Kakt., vol. 2 : t. 106 (1900-1905) [Toni Gürke]
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