Aichryson

Aichryson
Aichryson punctatum
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Saxifragales
Family: Crassulaceae
Subfamily: Sempervivoideae
Tribe: Aeonieae
Genus: Aichryson
Webb & Berthel.
Species

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.

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 phylogenetic 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

Other species recognized by Nyffeler in Eggli 2004 are:

Recently named species include:

References

  1. ^ 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.
  2. ^ "Aichryson × aizoides var. domesticum 'Variegatum'". www.rhs.org. Royal Horticultural Society. Retrieved 27 February 2020.
  3. ^ "AGM Plants - Ornamental" (PDF). www.rhs.org. Royal Horticultural Society. November 2018. p. 4. Retrieved 27 February 2020.
  4. ^ Ham and 't Hart. (1998). American Journal of Botany, 85: 123–134
  5. ^ Mort et al. (2001). American Journal of Botany, 88: 76–91
  6. ^ Mes and 't Hart. (1996). Molecular Ecology, 5: 351–363
  7. ^ Mort et al. (2002). Systematic Botany, 27: 271–288
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