Discocactus placentiformis (Lehm.) Schumann [ Discocactus insignis Pfeiff.]
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Discocactus placentiformis (Lehm.) Schumann [ Cactus placentiformis Lehm.] [Cactaceae]
L.K.G. Pfeiffer, F. Otto, Abbild. Beschr. Cact., vol. 2 : t. 1 (1846)