GREGORY DIMIJIAN / SCIENCE PHOTO LIBRARY GREGORY DIMIJIAN / SCIENCE PHOTO LIBRARY
Houseleek (Sempervivum sp.), also called Hens and Chicks, here grown in Jardin des Plantes, Paris, France. This is a genus of hardy alpine succulents found in mountains of Europe and once grown on roofs to guard against leaks and lightning. A rolled-up carpet of sempervivums was recently sold as roof cover.
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