Alfredia cernua (L.) Cass. [ Silybum cernuum (L.) Gaertner]
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Alfredia cernua (L.) Cass. [ Cnicus cernuus L.] [Compositae]
J. Gaertner, Fruct. Sem. Pl., vol. 2 : t. 162, fig. 2 (1791)