Biology:Cedrus atlantica

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Short description: Species of conifer


Cedrus atlantica
Cedrus atlantica.jpg
Atlas cedar (Ifrane, Morocco)
Scientific classification edit
Kingdom: Plantae
Clade: Tracheophytes
Clade: Gymnospermae
Division: Pinophyta
Class: Pinopsida
Order: Pinales
Family: Pinaceae
Genus: Cedrus
Species:
C. atlantica
Binomial name
Cedrus atlantica
(Endl.) Manetti ex Carrière
Cedrus atlantica range.svg
Distribution map
Synonyms

C. libani subsp. atlantica (Endl.) Batt. & Trab.

Cedrus atlantica, the Atlas cedar, is a species of tree in the pine family Pinaceae, native to the Rif and Atlas Mountains of Morocco (Middle Atlas, High Atlas), and to the Tell Atlas in Algeria.[2] A majority of the modern sources[3][4][5][6][7][8][9][10] treat it as a distinct species Cedrus atlantica, but some sources[11][12] consider it a subspecies of Lebanon cedar (C. libani subsp. atlantica).

Description

Cedrus atlantica foliage and mature female cone
Male cones beginning to shed pollen

Fully grown, Atlas cedar is a large coniferous evergreen tree, 30 to 35 m (98 to 115 ft) (rarely 40 m) tall, with a trunk diameter of 1.5 to 2 m (4.9 to 6.6 ft). It is very similar in all characters to the other varieties of Lebanon cedar; differences are hard to discern. The mean cone size tends to be somewhat smaller (although recorded to 12 cm,[2] only rarely over 9 cm long, compared to up to 10 cm in C. brevifolia, and 12 cm in C. libani), though with considerable overlap (all can be as short as 6 cm). The Cedrus atlantica leaf length (10–25 mm) is similar that of C. libani subsp. stenocoma, on average longer than C. brevifolia and shorter than C. libani subsp. libani, but again with considerable overlap.[2][8][13]

Ecology

Atlas cedar form forests on mountainsides at 1,170 to 2,200 m (3,840 to 7,220 ft), often in pure forests, or mixed with Algerian fir - Abies numidica, Juniperus oxycedrus, holm oak - Quercus ilex, and Acer opalus. These forests can provide habitat for the endangered Barbary macaque (Macaca sylvanus), a primate that had a prehistorically much wider distribution in northern Morocco and Algeria.[14]

Currently, Morocco has the highest total surface of Atlas cedar in the world, and it forms vast forests in the humid zones of the country, around the Middle-Atlas range, the oriental and Northern High-Atlas range, and in the Western and Central Rif mountain range. The current total area is around 163,000 hectares, of which around 115,000 hectares (80%) are situated in the Middle-Atlas mountains. The species is in danger from human use, wood harvesting and fires. Data that go back to 1927 show higher number of Atlas cedars (more than 150,000 hectares) in the Middle-Atlas mountains only. The Rif mountains had one of the largest cedar forests in the past, but forests nowadays are much smaller, 15% of the total cedar forests in Morocco. Recently massive reforestation campaigns have taken place in the region of Ifrane Province.[citation needed]

In Algeria, the Atlas cedar has been in significant decline. According to data from 1966 the species inhabited 23,000 hectares, forming forests around the Djurdjura Mountains in Kabylie and Aures Mountains. However, it is expected that it currently inhabits fewer than 15,000 hectares owing to extensive fires and human use.

Cultivation and uses

An old Cedrus atlantica tree in the Atlas Mountains, Morocco

Landscape

C. atlantica is common in cultivation as an ornamental tree in temperate climates. In garden settings, often the glaucous forms are planted as ornamental trees, distinguished as the Glauca group, a cultivar group. Also, fastigiate, pendulous, and golden-leaf forms are in cultivation. The Atlas cedar is useful in cultivation because it is more tolerant of dry and hot conditions than most conifers.[citation needed]

Many of the cultivated trees have glaucous (bluish) foliage, more downy shoots, and can have more leaves in each whorl; young trees in cultivation often have more ascending branches than many cultivated C. atlantica specimens.[15]

In the United Kingdom the following cultivars have gained the Royal Horticultural Society's Award of Garden Merit (confirmed 2017):[16]

  • ’Aurea' (golden Atlas cedar)[17]
  • ’Glauca' (Glauca Group)[18]
  • ’Glauca Pendula' (Glauca Group)[19]

An Atlas cedar is planted at the White House South Lawn in Washington, DC. President Carter ordered a tree house built within the cedar for his daughter Amy. The wooden structure was designed by the President himself, and is self-supporting so as not to cause damage to the tree.[20]

Forestry

A C. atlantica glauca (Blue Atlas cedar) at the Orland E. White Research Arboretum in Virginia, United States

Cedar plantations, mainly with C. atlantica, have been established in southern France for timber production.[citation needed]

References

  1. ↑ Thomas, P. (2013). "Cedrus atlantica". IUCN Red List of Threatened Species 2013: e.T42303A2970716. doi:10.2305/IUCN.UK.2013-1.RLTS.T42303A2970716.en. https://www.iucnredlist.org/species/42303/2970716. Retrieved 18 November 2021. 
  2. ↑ 2.0 2.1 2.2 Gaussen, H. (1964). Genre Cedrus. Les Formes Actuelles. Trav. Lab. For. Toulouse T2 V1 11: 295-320
  3. ↑ Gymnosperm database Cedrus.
  4. ↑ GRIN Taxonomy for Plants Cedrus .
  5. ↑ NCBI Taxonomy Browser Cedrus.
  6. ↑ Flora of China vol. 4
  7. ↑ Qiao, C.-Y., Jin-Hua Ran, Yan Li and Xiao-Quan Wang (2007): Phylogeny and Biogeography of Cedrus (Pinaceae) Inferred from Sequences of Seven Paternal Chloroplast and Maternal Mitochondrial DNA Regions. Annals of Botany 100(3):573-580. Available online[|permanent dead link|dead link}}]
  8. ↑ 8.0 8.1 Farjon, A. (1990). Pinaceae. Drawings and Descriptions of the Genera. Koeltz Scientific Books ISBN:3-87429-298-3.
  9. ↑ Farjon, A. (2008). A Natural History of Conifers. Timber Press ISBN:0-88192-869-0.
  10. ↑ Christou, K. A. (1991). The genetic and taxonomic status of Cyprus cedar, Cedrus brevifolia (Hook.) Henry. Mediterranean Agronomic Institute of Chania, Greece.
  11. ↑ Güner, A., Özhatay, N., Ekim, T., & Başer, K. H. C. (ed.). 2000. Flora of Turkey and the East Aegean Islands 11 (Supplement 2): 5–6. Edinburgh University Press. ISBN:0-7486-1409-5
  12. ↑ Eckenwalder, J. E. (2009). Conifers of the World: The Complete Reference. Timber Press ISBN:0-88192-974-3.
  13. ↑ Schwarz, O. (1944). Anatolica. Feddes Repertorium 54: 26-34.
  14. ↑ C. Michael Hogan. 2008. Barbary Macaque: Macaca sylvanus, GlobalTwitcher.com, ed. N. Stromberg
  15. ↑ Walters, W. M. (1986). European Garden Flora Vol 1. ISBN:0-521-24859-0.
  16. ↑ "AGM Plants - Ornamental". Royal Horticultural Society. July 2017. p. 16. https://www.rhs.org.uk/plants/pdfs/agm-lists/agm-ornamentals.pdf. 
  17. ↑ "RHS Plantfinder - Cedrus atlantica 'Aurea'". Royal Horticultural Society. https://www.rhs.org.uk/Plants/133001/i-Cedrus-atlantica-i-Aurea/Details. 
  18. ↑ "RHS Plantfinder - Cedrus atlantica (Glauca Group) 'Glauca'". Royal Horticultural Society. https://www.rhs.org.uk/Plants/133005/i-Cedrus-atlantica-i-(Glauca-Group)-Glauca/Details. 
  19. ↑ "RHS Plantfinder - Cedrus atlantica (Glauca Group) 'Glauca Pendula'". Royal Horticultural Society. https://www.rhs.org.uk/Plants/133008/i-Cedrus-atlantica-i-(Glauca-Group)-Glauca-Pendula/Details. 
  20. ↑ "The White House Historical Association > Picturing the President's House". http://www.whitehousehistory.org/04/subs_pph/PresidentDetail.aspx?ID=39&imageID=4232. 

External links

Wikidata ☰ Q623489 entry



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