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{{Taxobox
| color = lightgreen
| name = ''Aichryson''
| regnum = [[Plant]]ae
| divisio = [[Flowering plant|Magnoliophyta]]
| classis = [[Magnoliopsida]]
| ordo = [[Saxifragales]]
| familia = [[Crassulaceae]]
| genus = '''''Aichryson'''''
| genus_authority = [[Philip Barker Webb|Webb]] & [[Sabin Berthelot|Berthel.]]
| subdivision_ranks = Species
| subdivision =
''About 15; see text''
}}
'''''Aichryson''''' is a [[genus]] of about 15 species of succulent, subtropical plants, mostly native to the [[Canary Islands]], with a few in the [[Azores]], [[Madeira]] and [[Morocco]], and one in [[Portugal]].
The species of ''Aichryson'' are not frost-resistant. They are related to ''[[Sempervivum]], [[Jovibarba]], [[Greenovia]], [[Aeonium]]'' and ''[[Monanthes]]'', readily seen in their similar flowers.
==Relationships==
Recent phylogenentic studies of Crassulaceae indicate that ''Aichryson'' is closely related to ''[[Monanthes]]'' and ''[[Aeonium]]'' (both genera are also largely endemic to the Canary Islands). Two other genera of Crassulaceae that have many-parted (polymerous) flowers (''[[Sempervivum]]'' and ''[[Jovibarba]]'') are not closely realted to the three Canary Island genera.<ref>Ham and 't Hart. (1998). ''American Journal of Botany'', 85: 123-134</ref><ref>Mort et al. (2001). ''American Journal of Botany'', 88: 76-91</ref><ref>Mes and 't Hart. (1996). ''Molecular Ecology'', 5: 351-363</ref><ref>Mort et al. (2002). ''Systematic Botany'', 27: 271-288</ref>
On the Canary Islands, the center of species diversity seems to be the island of La Palma Relationships within Aichryson were investigated by Fairfield et al (2004) [Plant Systematics and Evolution248: 71-83]. They found that the five subspeies of A. pachycaulon were not each others closest relatives (monophyletic) and additional species may need to be erected after additional study.
==Species==
* ''[[Aichryson bethencourtianum]]''
* ''[[Aichryson bollei]]''
* ''[[Aichryson divaricatum]]''
* ''[[Aichryson laxum]]''
* ''[[Aichryson palmense]]''
* ''[[Aichryson porphyrogennetos]]''
* ''[[Aichryson tortuosum]]'' (Gouty Houseleek)
* ''[[Aichryson villosum]]''
Other species recognized by Nyffeler in Eggli 2004 are:
* ''[[Aichryson brevipetalum]]''
* ''[[Aichryson dumosum]]''
* ''[[Aichryson pachycaulon]]'' (five subspecies have been recognized)
* ''[[Aichryson parlatorei]]''
* ''[[Aichryson punctatum]]''
A recently named species is:
* ''[[Aichryson bitumosum]]''
==References==
{{Reflist}}
{{Crassulaceae-stub}}
[[Category:Crassulaceae]]
| color = lightgreen
| name = ''Aichryson''
| regnum = [[Plant]]ae
| divisio = [[Flowering plant|Magnoliophyta]]
| classis = [[Magnoliopsida]]
| ordo = [[Saxifragales]]
| familia = [[Crassulaceae]]
| genus = '''''Aichryson'''''
| genus_authority = [[Philip Barker Webb|Webb]] & [[Sabin Berthelot|Berthel.]]
| subdivision_ranks = Species
| subdivision =
''About 15; see text''
}}
'''''Aichryson''''' is a [[genus]] of about 15 species of succulent, subtropical plants, mostly native to the [[Canary Islands]], with a few in the [[Azores]], [[Madeira]] and [[Morocco]], and one in [[Portugal]].
The species of ''Aichryson'' are not frost-resistant. They are related to ''[[Sempervivum]], [[Jovibarba]], [[Greenovia]], [[Aeonium]]'' and ''[[Monanthes]]'', readily seen in their similar flowers.
==Relationships==
Recent phylogenentic studies of Crassulaceae indicate that ''Aichryson'' is closely related to ''[[Monanthes]]'' and ''[[Aeonium]]'' (both genera are also largely endemic to the Canary Islands). Two other genera of Crassulaceae that have many-parted (polymerous) flowers (''[[Sempervivum]]'' and ''[[Jovibarba]]'') are not closely realted to the three Canary Island genera.<ref>Ham and 't Hart. (1998). ''American Journal of Botany'', 85: 123-134</ref><ref>Mort et al. (2001). ''American Journal of Botany'', 88: 76-91</ref><ref>Mes and 't Hart. (1996). ''Molecular Ecology'', 5: 351-363</ref><ref>Mort et al. (2002). ''Systematic Botany'', 27: 271-288</ref>
On the Canary Islands, the center of species diversity seems to be the island of La Palma Relationships within Aichryson were investigated by Fairfield et al (2004) [Plant Systematics and Evolution248: 71-83]. They found that the five subspeies of A. pachycaulon were not each others closest relatives (monophyletic) and additional species may need to be erected after additional study.
==Species==
* ''[[Aichryson bethencourtianum]]''
* ''[[Aichryson bollei]]''
* ''[[Aichryson divaricatum]]''
* ''[[Aichryson laxum]]''
* ''[[Aichryson palmense]]''
* ''[[Aichryson porphyrogennetos]]''
* ''[[Aichryson tortuosum]]'' (Gouty Houseleek)
* ''[[Aichryson villosum]]''
Other species recognized by Nyffeler in Eggli 2004 are:
* ''[[Aichryson brevipetalum]]''
* ''[[Aichryson dumosum]]''
* ''[[Aichryson pachycaulon]]'' (five subspecies have been recognized)
* ''[[Aichryson parlatorei]]''
* ''[[Aichryson punctatum]]''
A recently named species is:
* ''[[Aichryson bitumosum]]''
==References==
{{Reflist}}
{{Crassulaceae-stub}}
[[Category:Crassulaceae]]
