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==Species==
==Species==
[[Image:CommonHouseleek.jpg|thumb|left|200px| ''[[Sempervivum tectorum]]'' (Common Houseleek)]]
[[Image:CommonHouseleek.jpg|thumb|200px| ''[[Sempervivum tectorum]]'' (Common Houseleek)]]
[[Image:Sempervivum arachnoideum.jpg|thumb|left|200px|''Sempervivum arachnoideum''.]]
[[Image:Sempervivum arachnoideum.jpg|thumb|200px|''Sempervivum arachnoideum''.]]
[[Image:Sempervivum tectorum.JPG|thumb|left|250px|''[[Sempervivum tectorum]]'']]
[[Image:Sempervivum tectorum.JPG|thumb|250px|''[[Sempervivum tectorum]]'']]
The genus ''Sempervivum'' is easy to recognize, but its species are often not easy to identify. Even one single clone can look very different under various growth conditions ([[modifications (genetics)|modifications]]) or different times of the year. The members of this genus are very similar and closely linked to each other. As a consequence, many [[subspecies]], [[variety (biology)|varieties]], and [[form (botany)|form]]s were described, without well-defined limits between them. As a second consequence, there are a high frequency of natural [[Hybrid (biology)|hybrids]] in this genus and the possibility of [[back-crossing]]s of these. However, more or less 40 species can be individualized in the whole area of the genus, but there are many more local [[population]]s, without nomenclatural valour but with sometimes their own characters.
The genus ''Sempervivum'' is easy to recognize, but its species are often not easy to identify. Even one single clone can look very different under various growth conditions ([[modifications (genetics)|modifications]]) or different times of the year. The members of this genus are very similar and closely linked to each other. As a consequence, many [[subspecies]], [[variety (biology)|varieties]], and [[form (botany)|form]]s were described, without well-defined limits between them. As a second consequence, there are a high frequency of natural [[Hybrid (biology)|hybrids]] in this genus and the possibility of [[back-crossing]]s of these. However, more or less 40 species can be individualized in the whole area of the genus, but there are many more local [[population]]s, without nomenclatural valour but with sometimes their own characters.