Alder

For other uses, see Alder (disambiguation).
Alder
Alnus serrulata (tag alder)
Male catkins on right,
mature female catkins left
Johnsonville, South Carolina
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Fagales
Family: Betulaceae
Genus: Alnus
Mill.
Synonyms[1]
Alder trees by the Beaulieu River at Longwater Lawn, England

Alder is the common name of a genus of flowering plants (Alnus) belonging to the birch family Betulaceae. The genus comprises about 35[2] species of monoecious trees and shrubs, a few reaching a large size, distributed throughout the north temperate zone with a few species extending into Central America, as well as the northern and southern Andes.[1]

Etymology

The common name alder evolved from Old English alor, which in turn is derived from Proto-Germanic root[3] aliso. The generic name Alnus is the equivalent Latin name. Both the Latin and the Germanic words derive from the Proto-Indo-European root el-, meaning "red" or "brown", which is also a root for the English words elk and another tree: elm, a tree distantly related to the alders.[4]

Description

With a few exceptions, alders are deciduous, and the leaves are alternate, simple, and serrated. The flowers are catkins with elongate male catkins on the same plant as shorter female catkins, often before leaves appear; they are mainly wind-pollinated, but also visited by bees to a small extent. These trees differ from the birches (Betula, the other genus in the family) in that the female catkins are woody and do not disintegrate at maturity, opening to release the seeds in a similar manner to many conifer cones.

The largest species are red alder (A. rubra) on the west coast of North America, and black alder (A. glutinosa), native to most of Europe and widely introduced elsewhere, both reaching over 30 m. By contrast, the widespread Alnus viridis (green alder) is rarely more than a 5-m-tall shrub.

Ecology

Alders are commonly found near streams, rivers, and wetlands. In the Pacific Northwest of North America, the white alder (Alnus rhombifolia) unlike other northwest alders, has an affinity for warm, dry climates, where it grows along watercourses, such as along the lower Columbia River east of the Cascades and the Snake River, including Hells Canyon.

Alder leaves and sometimes catkins are used as food by numerous butterflies and moths.

A. glutinosa and A. viridis are classed as environmental weeds in New Zealand.[5] Alder leaves and especially the roots are important to the ecosystem because they enrich the soil with nitrogen and other nutrients.

Nitrogen fixation

Alder is particularly noted for its important symbiotic relationship with Frankia alni, an actinomycete, filamentous, nitrogen-fixing bacterium. This bacterium is found in root nodules, which may be as large as a human fist, with many small lobes, and light brown in colour. The bacterium absorbs nitrogen from the air and makes it available to the tree. Alder, in turn, provides the bacterium with sugars, which it produces through photosynthesis. As a result of this mutually beneficial relationship, alder improves the fertility of the soil where it grows, and as a pioneer species, it helps provide additional nitrogen for the successional species which follow.

Because of its abundance, red alder delivers large amounts of nitrogen to enrich forest soils. Red alder stands have been found to supply between 120 and 290 pounds of nitrogen per acre (130 to 320 kg per ha) annually to the soil. From Alaska to Oregon, Sitka alder characteristically pioneer fresh, gravelly sites at the foot of retreating glaciers. Studies show that Sitka alder, a more shrubby variety of alder, adds nitrogen to the soil at an average of 55 pounds per acre (60 per ha) per year, helping convert the sterile glacial terrain to soil capable of supporting a conifer forest. Alders are common among the first species to colonize disturbed areas from floods, windstorms, fires, landslides, etc. Alder groves themselves often serve as natural firebreaks since these broad-leaved trees are much less flammable than conifers. Their foliage and leaf litter does not carry a fire well, and their thin bark is sufficiently resistant to protect them from light surface fires. In addition, the alder's light weight (650,000 seeds per pound, or 1.5 million per kg) allows for easy dispersal by the wind. Although it outgrows coastal Douglas-fir for the first 25 years, it is very shade intolerant and seldom lives more than 100 years. Red alder is the Pacific Northwest's largest alder and the most plentiful and commercially important broad-leaved tree in the coastal Northwest. Groves of red alder 10 to 20 inches (25 to 50 cm) in diameter intermingle with young Douglas-fir forests west of the Cascades, attaining a maximum height of 100 to 110 feet (30 to 33 m) in about sixty years and then lose vigor as heart rot sets in. Alders largely help create conditions favorable for giant conifers that replace them.[6]

Parasites

Alder roots are parasitized by northern groundcone.

Uses

Alder coat of arms of Grossarl, Austria

The catkins of some alder species have a degree of edibility,[7] and may be rich in protein. Reported to have a bitter and unpleasant taste, they are more useful for survival purposes. The wood of certain alder species is often used to smoke various food items such as coffee, salmon and other seafood.

Most of the pilings that form the foundation of Venice were made from alder trees.[8]

Alder bark contains the anti-inflammatory salicin, which is metabolized into salicylic acid in the body.[9] Some Native American cultures use red alder bark (Alnus rubra) to treat poison oak, insect bites, and skin irritations. Blackfeet Indians have traditionally used an infusion made from the bark of red alder to treat lymphatic disorders and tuberculosis. Recent clinical studies have verified that red alder contains betulin and lupeol, compounds shown to be effective against a variety of tumors.[10]

The inner bark of the alder, as well as red osier dogwood, or chokecherry, is used by some Indigenous peoples of the Americas in smoking mixtures, known as kinnikinnick, to improve the taste of the bearberry leaf.[11]

Alder is illustrated in the coat of arms for the Austrian town of Grossarl.

Electric guitars, most notably the Fender Jazz Bass, Fender Precision Bass, Fender Stratocaster and Fender Telecaster, have been built with alder bodies since the 1950s. Alder is appreciated for its claimed tight and even balanced tone, especially when compared to mahogany, and has been adopted by many electric guitar manufacturers.

As a hardwood, alder is used in making furniture, cabinets, and other woodworking products. For example, in the television series Northern Exposure season 3 episode "Things Become Extinct" (1992), Native American Ira Wingfeather makes duck flutes out of alder tree branches while Ed Chigliak films.

Alder bark and wood (like oak and sweet chestnut) contain tannin and are traditionally used to tan leather.

A red dye can also be extracted from the outer bark, and a yellow dye from the inner bark.[12]

Classification

The genus is divided into three subgenera:

Subgenus Alnus: Trees with stalked shoot buds, male and female catkins produced in autumn (fall) but stay closed over winter, pollinating in late winter or early spring, about 15–25 species, including:

Speckled alder (Alnus incana subsp. rugosa)—leaves
Leaves of the tag alder

Subgenus Clethropsis. Trees or shrubs with stalked shoot buds, male and female catkins produced in autumn (fall) and expanding and pollinating then, three species:

Subgenus Alnobetula. Shrubs with shoot buds not stalked, male and female catkins produced in late spring (after leaves appear) and expanding and pollinating then, one to four species:

Green Alder (Alnus viridis)
Unknown subgenus

Hybrids


References

  1. 1 2 Kew World Checklist of Selected Plant Families
  2. ↑ Arno, Stephen; Hammerly, Ramona (2007). Northwest Trees: Identifying and Understanding the Region's Native Trees. Seattle, WA: Mountaineers Books. p. 165. ISBN 978-1-59485-041-7.
  3. ↑ http://www.etymonline.com/index.php?term=alder&allowed_in_frame=0
  4. ↑ http://www.etymonline.com/index.php?term=elk&allowed_in_frame=0
  5. ↑ Clayson, Howell (May 2008). Consolidated list of environmental weeds in New Zealand. Wellington: Department of Conservation. ISBN 978-0-478-14412-3.
  6. ↑ Arno, Stephen; Hammerly, Ramona (2007). Northwest Trees: Identifying and Understanding the Region's Native Trees. Seattle, WA: The Mountaineers Books. pp. 165–69. ISBN 978-1-59485-041-7.
  7. ↑ Plants For A Future (Database)
  8. ↑ Kendall, Paul (25 August 2010). "Mythology and Folklore of the Alder". Trees for life. Retrieved 6 August 2011.
  9. ↑ Ewing, Susan. The Great Alaska Nature Factbook. Portland: Alaska Northwest Books, 1996.
  10. ↑ Edible and Medicinal Plants of the West, Gregory L. Tilford, ISBN 0-87842-359-1
  11. ↑ Staff (2009) "Bearberry" Discovering Lewis and Clark. The Lewis and Clark Fort Mandan Foundation.
  12. ↑ "Native Plant Dyes". United States Department of Agriculture Forest Service. Retrieved 17 December 2014.

Further reading

External links

Wikimedia Commons has media related to Alnus.
Wikispecies has information related to: Alnus
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