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Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Ordo: Saxifragales

Familia: Crassulaceae
Subfamilia: Sempervivoideae
Tribus: Aeonieae
Genus: Aichryson
Species: A. bituminosum – A. bollei – A. brevipetalum – A. divaricatum – A. dumosum – A. laxum – A. pachycaulon – A. palmense – A. parlatorei – A. porphyrogennetos – A. punctatum – A. tortuosum – A. villosum

Nothospecies A. × aizoides – A. × azuajei – A. × bramwellii – A. × intermedium – A. × praegeri

Name

Aichryson Webb & Berthel., Hist. Nat. Iles Canaries (Phytogr.). 3(2:1): 180, t. 27. 1840.
Type species: non design.

References

Webb, P.B. & Berthelot, S. 1836–1850. Histoire Naturelle des Iles Canaries. Tome 3, partie 2, sect. 3. Phytographia Canariensis. 479 pp., tab. 137–250. Paris: Béthune. BHL Reference page. : 3(2): sect. 1: 180, t. 27 [1].

Links

Hassler, M. 2019. Aichryson. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2019. Species 2000 & ITIS Catalogue of Life. Published on the internet. Accessed: 2019 Dec 01. Reference page.
International Plant Names Index. 2019. Aichryson. Published online. Accessed: Dec 01 2019.
Govaerts, R. et al. 2019. Aichryson in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the internet. Accessed: 2019 Dec 01. Reference page.
Tropicos.org 2019. Aichryson. Missouri Botanical Garden. Published on the internet. Accessed: 2019 Dec 01.

Vernacular names
suomi: Keltapaunikot

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.

The genus name comes from a contraction of the Greek "aei" (always) and "chrysos" (gold).[1]

Several species are cultivated as ornamental plants. The hybrid cultivar Aichryson × aizoides var. domesticum 'Variegatum' is a recipient of the Royal Horticultural Society's Award of Garden Merit.[2][3]

Taxonomy

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.[4][5][6][7]

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 Evolution 248: 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.
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

Recently named species include:

Aichryson bitumosum
Aichryson santamariensis

References

Eggli, Urs; Newton, Leonard E. (2004). Etymological Dictionary of Succulent Plant Names. Berlin, Heidelberg: Springer. p. 4. ISBN 978-3-540-00489-9. Retrieved 11 November 2018.
"'Aichryson × aizoides var. domesticum 'Variegatum'". www.rhs.org. Royal Horticultural Society. Retrieved 27 February 2020.
"AGM Plants - Ornamental" (PDF). www.rhs.org. Royal Horticultural Society. November 2018. p. 4. Retrieved 27 February 2020.
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

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