Sempervivum arachnoideum
 Sempervivum arachnoideum sometimes known as cobweb houseleek is a species of flowering plant in the family Crassulaceae native to the Alps Apennines and Carpathians. Growing to 8 cm (3 in) tall by 30 cm (12 in) wide it is a rosette-forming succulent perennial valued in cultivation for its ability to colonise hot dry areas via offsets. Its name arachnoideum refers to its furry central rosettes resembling spider webs.