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, 20:08, 25 May 2010
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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. |
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