Discocactus placentiformis (Lehm.) Schumann [ Discocactus tricornis Monv. ex Pfeiff. & Otto]
      

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6 351757 Discocactus placentiformis (Lehm.) Schumann [125 171896 Cactus placentiformis Lehm.] Cactaceae
L.K.G. Pfeiffer, F. Otto, Abbild. Beschr. Cact. (Coloured version), vol. 2 : p. 28, t. 28 (1839)