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5 24533 Aeonium urbicum (C.Sm. ex Hornem.) Webb & Berthel. (C.Sm. ex Hornem.) Webb & Berthel. [Sempervivum urbicum C. Sm. ex Hornem.]
H.G.A. Engler, O. Drude, Veg. Erde, vol. 9(1): (Die Pflanzenwelt Afrikas insbesondere seiner tropischen Gebiete): p. 849, fig. 697 (1896)
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