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Description

Leaves

Firs can be distinguished from other members of the pine family by the unique attachment of their needle-like leaves to the twig by a base that resembles a small suction cup. The leaves are significantly flattened, sometimes even looking like they are pressed, as in A. sibirica.

The leaves have two whitish lines on the bottom, each of which is formed by wax-covered stomatal bands. In most species, the upper surface of the leaves is uniformly green and shiny, without stomata or with a few on the tip, visible as whitish spots. Other species have the upper surface of leaves dull, greyish green or bluish to silvery (glaucous), coated by wax with variable number of stomatal bands, and not always continuous. An example species with shiny green leaves is A. alba, and an example species with matt waxy leaves is A. concolor.

The tips of leaves are usually more or less notched (as in A. firma), but sometimes rounded or dull (as in A. concolor, A. magnifica) or sharp and prickly (as in A. bracteata, A. cephalonica, A. holophylla). The leaves of young plants are usually sharper.

The leaves are arranged spirally on the shoots, but by being twisted at their base, the way they spread from the shoot is diverse; in some species comb-like ('pectinate'), with the leaves flat on either side of the shoot (e.g. A. alba, A. grandis), in others, the leaves remain radial (e.g. A. pinsapo)⁶

Foliage in the upper crown on cone-bearing branches is different, with the leaves shorter, curved, and sometimes sharp.⁷

Cones

Firs differ from other conifers in having erect, cylindrical cones 5–25 cm (2–10 in) long that disintegrate at maturity to release the winged seeds. In contrast to spruces, fir cones are erect; they do not hang, unless heavy enough to twist the branch with their weight.

The mature cones are usually brown. When young in summer, they can be green:

or reddish:

or bloomed pale glaucous or pinkish:

or purple to blue, sometimes very dark blue, almost black:

Many species are polymorphic in cone colour, with different individuals of the same species producing either green or purple cones:

The cone scale bracts can be short and hidden in the mature cone, or long and exposed ('exserted'); this can vary even within a species, e.g. in Abies magnifica var. magnifica, the bracts are hidden, but in var. critchfieldii and var. shastensis, they are exserted. The bracts scales are often a different colour to the cone scales, which can make for a very attractive combination valued in ornamental trees.

Classification

The oldest pollen assignable to the genus dates to the Late Cretaceous in Siberia, with records of leaves and reproductive organs across the Northern Hemisphere from the Eocene onwards.⁹

Section Abies

Section Abies is found in central, south, and eastern Europe and Asia Minor.

• Abies alba – silver fir or European silver fir
• Abies nebrodensis – Sicilian fir
• Abies borisii-regis – Bulgarian fir
• Abies cephalonica – Greek fir
• Abies nordmanniana – Caucasian fir or Nordmann fir
  • Abies nordmanniana subsp. equi-trojani – Kazdağı fir, Turkish fir
• Abies pinsapo – Spanish fir
  • Abies pinsapo var. marocana – Moroccan fir
• Abies numidica – Algerian fir
• Abies cilicica – Syrian fir

Section Balsamea

Section Balsamea is found in northern Asia and North America, and high mountains further south.

• Abies fraseri – Fraser's fir
• Abies balsamea – balsam fir
  • Abies balsamea var. phanerolepis – bracted balsam fir
• Abies lasiocarpa – subalpine fir
  • Abies lasiocarpa var. arizonica – corkbark fir
  • Abies lasiocarpa var. bifolia – Rocky Mountains subalpine fir
• Abies sibirica – Siberian fir
  • Abies sibirica var. semenovii
• Abies sachalinensis – Sakhalin fir
• Abies koreana – Korean fir
• Abies nephrolepis – Khinghan fir
• Abies veitchii – Veitch's fir
  • Abies veitchii var. sikokiana – Shikoku fir

Section Grandis

Section Grandis is found in western North America to Mexico, Guatemala, Honduras and El Salvador, in lowlands in the north, moderate altitudes in south.

• Abies grandis – grand fir or giant fir
  • Abies grandis var. grandis – Coast grand fir
  • Abies grandis var. idahoensis – interior grand fir
• Abies concolor – white fir
  • Abies concolor subsp. concolor – Rocky Mountain white fir or Colorado white fir
  • Abies concolor subsp. lowiana – Low's white fir or Sierra Nevada white fir
• Abies durangensis – Durango fir
  • Abies durangensis var. coahuilensis – Coahuila fir
• Abies flinckii – Jalisco fir
• Abies guatemalensis – Guatemalan fir
  • Abies guatemalensis var. guatemalensis
  • Abies guatemalensis var. jaliscana
• Abies vejarii

Section Momi

Section Momi is found in east and central Asia and the Himalaya, generally at low to moderate altitudes.

• Abies kawakamii – Taiwan fir
• Abies homolepis – Nikko fir
• Abies recurvata – Min fir
  • Abies recurvata var. ernestii – Min fir
• Abies firma – Momi fir
• Abies beshanzuensis – Baishanzu fir
• Abies holophylla – Manchurian fir
• Abies chensiensis – Shensi fir
  • Abies chensiensis subsp. salouenensis – Salween fir
• Abies pindrow – Pindrow fir
• Abies ziyuanensis – Ziyuan fir

Section Amabilis

Section Amabilis is found in the Pacific Coast mountains in North America and Japan, in high rainfall areas.

• Abies amabilis – Pacific silver fir
• Abies mariesii – Maries' fir

Section Pseudopicea

Section Pseudopicea is found in the Sino – Himalayan mountains at high altitudes.

• Abies delavayi – Delavay's fir
  • Abies delavayi var. nukiangensis
  • Abies delavayi var. motuoensis
  • Abies delavayi subsp. fansipanensis
• Abies fabri – Faber's fir
  • Abies fabri subsp. minensis
• Abies forrestii – Forrest's fir
• Abies densa – Bhutan fir
• Abies spectabilis – East Himalayan fir
• Abies fargesii – Farges' fir
• Abies fanjingshanensis – Fanjingshan fir
• Abies yuanbaoshanensis – Yuanbaoshan fir
• Abies squamata – flaky fir

Section Oiamel

Section Oiamel is found in central Mexico at high altitudes.

• Abies religiosa – sacred fir
• Abies hickelii – Hickel's fir
  • Abies hickelii var. oaxacana – Oaxaca fir

Section Nobilis

Section Nobilis (western U.S., high altitudes)

• Abies procera – noble fir
• Abies magnifica – red fir
  • Abies magnifica var. shastensis – Shasta red fir

Section Bracteata

Section Bracteata (California coast)

• Abies bracteata – bristlecone fir
• ?†Abies rigida Frank Knowlton¹²¹³ - (Priabonian-Chattian; Colorado)

Section Incertae sedis

Section Incertae sedis

• †Abies milleri – (Extinct) Early Eocene¹⁴

Ecology

Firs are used as food plants by the caterpillars of some Lepidoptera species, including Chionodes abella (recorded on white fir), autumnal moth, conifer swift (a pest of balsam fir), the engrailed, grey pug, mottled umber, pine beauty and the tortrix moths Cydia illutana (whose caterpillars are recorded to feed on European silver fir cone scales) and C. duplicana (on European silver fir bark around injuries or canker).

Abies religiosa (sacred fir) trees give roosting shelter to overwintering monarch butterflies.¹⁵¹⁶

Phytochemistry

Abies produce a variety of terpenoids. The analyses of the Zavarin group – from Smedman et al. 1969 to Zavarin et al. 1977 – showed variation in terpenoid composition of the bark by genetics, geography, age and size of the tree.¹⁷¹⁸

Uses

Wood of most firs is considered unsuitable for general timber use and is often used as pulp or for the manufacture of plywood and rough timber. It is commonly used in Canadian Lumber Standard graded wood.¹⁹ Because this genus has no insect or decay resistance qualities after logging, it is generally recommended in construction purposes for indoor use only (e.g. indoor drywall on framing). Firwood left outside cannot be expected to last more than 12 to 18 months, depending on the type of climate it is exposed to.

Caucasian fir, noble fir, Fraser's fir and balsam fir are popular Christmas trees, generally considered to be the best for this purpose, with aromatic foliage that does not shed many needles on drying out. Many are also decorative garden trees, notably Korean fir and Fraser's fir, which produce brightly coloured cones even when very young, still only 1–2 m (3 ft 3 in – 6 ft 7 in) tall. Many fir species are grown in botanic gardens and other specialist tree collections in Europe and North America.²⁰

Abies spectabilis or Talispatra is used in Ayurveda as an antitussive (cough suppressant) drug.²¹²²

See also

• Douglas-fir
• List of fir species of Denmark

Further reading

• Philips, Roger. Trees of North America and Europe, Random House, Inc., New York ISBN 0-394-50259-0, 1979.

External links

• Abies at The Gymnosperm Database
• Abies from the website Trees and Shrubs Online
• Michael P. FRANKIS CONE COLLECTION: Abies at the Arboretum de Villardebelle—images of cones of selected species
• Platt, Karen "Gold Fever" provides descriptions of golden or yellow-leaved Abies cultivars

References

1. Torres, Leon Nahuel; Shi, Xiao; Na, Yuling; Wang, Bing; Tian, Chi; Chen, Jun (2024-03-01). "First study on fossil wood from the Middle Pleistocene of the Songliao Plain, Northeast China". Review of Palaeobotany and Palynology. 322: 105063. Bibcode:2024RPaPa.32205063T. doi:10.1016/j.revpalbo.2024.105063. ISSN 0034-6667. https://www.sciencedirect.com/science/article/pii/S0034666724000149 ↩

2. Debreczy Zsolt Rácz István and Kathy Musial. 2011. Conifers Around the World : Conifers of the Temperate Zones and Adjacent Regions. Budapest: DendroPress. ↩

3. Leslie, Andrew B.; et al. (2018). "ajb21143-sup-0004-AppendixS4" (PDF). American Journal of Botany. 105 (9): 1531–1544. doi:10.1002/ajb2.1143. PMID 30157290. https://bsapubs.onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1002%2Fajb2.1143&file=ajb21143-sup-0004-AppendixS4.pdf ↩

4. Coombes, Allen J. (2012). The A to Z of plant names : a quick reference guide to 4000 garden plants (1st ed.). Portland, Or.: Timber Press. pp. 17, 23. ISBN 978-1-60469-196-2. OCLC 741564356. 978-1-60469-196-2 ↩

5. "fir | Origin and meaning of fir by Online Etymology Dictionary". www.etymonline.com. Archived from the original on 2021-08-08. Retrieved 2020-10-01. https://www.etymonline.com/word/fir ↩

6. Seneta, Włodzimierz (1981). Drzewa i krzewy iglaste (Coniferous trees and shrubs) (in Polish) (1st ed.). Warsaw: Państwowe Wydawnictwo Naukowe (PWN). ISBN 978-83-01-01663-0. 978-83-01-01663-0 ↩

7. Arno, Stephen F.; Hammerly, Ramona P. (2020) [1977]. Northwest Trees: Identifying & Understanding the Region's Native Trees (field guide ed.). Seattle: Mountaineers Books. p. 125. ISBN 978-1-68051-329-5. OCLC 1141235469. Archived from the original on 2023-09-19. Retrieved 2022-02-26. 978-1-68051-329-5 ↩

8. Seneta, Włodzimierz (1981). Drzewa i krzewy iglaste (Coniferous trees and shrubs) (in Polish) (1st ed.). Warsaw: Państwowe Wydawnictwo Naukowe (PWN). ISBN 978-83-01-01663-0. 978-83-01-01663-0 ↩

9. Xiang, Xiaoguo; Cao, Ming; Zhou, Zhekun (October 2007). "Fossil history and modern distribution of the genus Abies (Pinaceae)". Frontiers of Forestry in China. 2 (4): 355–365. doi:10.1007/s11461-007-0058-4. ISSN 1673-3517. Archived from the original on 2024-01-01. Retrieved 2023-02-15. http://link.springer.com/10.1007/s11461-007-0058-4 ↩

10. Stull, Gregory W.; Qu, Xiao-Jian; Parins-Fukuchi, Caroline; Yang, Ying-Ying; Yang, Jun-Bo; Yang, Zhi-Yun; Hu, Yi; Ma, Hong; Soltis, Pamela S.; Soltis, Douglas E.; Li, De-Zhu; Smith, Stephen A.; Yi, Ting-Shuang; et al. (2021). "Gene duplications and phylogenomic conflict underlie major pulses of phenotypic evolution in gymnosperms". Nature Plants. 7 (8): 1015–1025. Bibcode:2021NatPl...7.1015S. bioRxiv 10.1101/2021.03.13.435279. doi:10.1038/s41477-021-00964-4. PMID 34282286. S2CID 232282918. Archived from the original on 2022-01-10. Retrieved 2023-03-30. https://www.nature.com/articles/s41477-021-00964-4 ↩

11. Stull, Gregory W.; et al. (2021). "main.dated.supermatrix.tree.T9.tre". Figshare. doi:10.6084/m9.figshare.14547354.v1. Archived from the original on 2024-01-01. Retrieved 2023-03-30. {{cite journal}}: Cite journal requires |journal= (help) https://figshare.com/articles/dataset/Gene_duplications_and_genomic_conflict_underlie_major_pulses_of_phenotypic_evolution_in_gymnosperms/14547354 ↩

12. Knowlton, F.H. (1923). Fossil plants from the Tertiary lake beds of South-Сentral Colorado (Report). Professional Paper. Vol. 131-G. United States Geological Survey. pp. 183–197. doi:10.3133/pp131G. /wiki/Doi_(identifier) ↩

13. Wolfe, J.A.; Schorn, H.E. (1990). Taxonomic revision of the Spermatopsida of the Oligocene Creede flora, southern Colorado (Report). Bulletin. Vol. 1923. United States Geological Survey. pp. 1–40. doi:10.3133/b1923. /wiki/Doi_(identifier) ↩

14. Schorn, Howard; Wehr, Wesley (1986). "Abies milleri, sp. nov., from the Middle Eocene Klondike Mountain Formation, Republic, Ferry County, Washington". Burke Museum Contributions in Anthropology and Natural History. 1: 1–7. ↩

15. Groth, Jacob (10 November 2000). "Monarch Migration Study". Swallowtail Farms. Archived from the original on 9 May 2022. Retrieved 21 July 2014. http://www.swallowtailfarms.com/pages/educationalproducts_mms.html ↩

16. "Monarch Migration". Monarch Joint Venture. 2013. Archived from the original on 2017-10-31. Retrieved 2017-10-25. http://www.monarchjointventure.org/monarch-biology/monarch-migration/ ↩

17. Hemingway, R. W. (2018-01-18). "Bark: Its Chemistry and Prospects for Chemical Utilization". Organic Chemicals from Biomass. CRC Press. pp. 189–248. ISBN 978-1-351-07525-1. 978-1-351-07525-1 ↩

18. Barton, George M. (2018-01-18). "Foliage". Organic Chemicals from Biomass. CRC Press. pp. 249–280. ISBN 978-1-351-07525-1. 978-1-351-07525-1 ↩

19. Jenkins, Steve (2023-09-03). "What is CLS timber and what DIY projects is it good for?". Homebuilding & Renovating. Retrieved 2024-08-22. https://www.homebuilding.co.uk/advice/what-is-cls-timber ↩

20. "Christian, T. (2021) Abies from the website Trees and Shrubs Online". Archived from the original on 2023-03-01. Retrieved 2023-03-01. https://treesandshrubsonline.org/articles/abies/ ↩

21. Schar, Douglas (2015). "Douglas Fir, Pseudotsuga menziesii". Archives. Doctor Schar. Archived from the original on 2015-10-05. Retrieved 2015-10-04. http://doctorschar.com/archives/douglas-fir-pseudotsuga-menziesii/ ↩

22. Kershaw, Linda (2000). Edible and Medicinal Plants of the Rockies. Edmonton, AB: Lone Pine Publishing. p. 26. ISBN 978-1-55105-229-8. 978-1-55105-229-8 ↩