Aichryson tortuosum (Aiton) Webb & Berthel. [ Sempervivum tortuosum Aiton]
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Aichryson tortuosum (Aiton) Webb & Berthel. [ Sempervivum tortuosum Aiton] [Crassulaceae]
de Candolle, P.J. Redouté, Pl. Hist. Succ., vol. 2(): fasicle 28, : t. 156, fig. new (1805)