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''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 related to the three Canary Island genera.〔Ham and 't Hart. (1998). ''American Journal of Botany'', 85: 123-134〕〔Mort et al. (2001). ''American Journal of Botany'', 88: 76-91〕〔Mes and 't Hart. (1996). ''Molecular Ecology'', 5: 351-363〕〔Mort et al. (2002). ''Systematic Botany'', 27: 271-288〕 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) (Systematics and Evolution248: 71-83 ). They found that the five subspecies of A. pachycaulon were not each other's closest relatives (monophyletic) and additional species may need to be erected after additional study. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Aichryson」の詳細全文を読む スポンサード リンク
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