Hist. Nat. Îles Canaries3(2,1): 184, plates 28–35. 1840 ,
Introduced; Calif., Asia (Yemen), Africa, Atlantic Islands (especially Canary Islands).
Species 31 (2 in the flora).
Aeonium and the other polymerous-flowered Macaronesian Crassulaceae were formerly included in the polymerous-flowered Sempervivum. From studies in DNA and molecular systematics, T. H. M. Mes (1995) concluded that Aeonium and these related genera probably evolved from North African Sedum-like ancestors and are only more distantly related to Sempervivum. He thought that the wide range of growth-forms in Aeonium, including the woody habit, is derived from herbaceous ancestors.