Sorbus Aucuparia

''Sorbus aucuparia'', commonly called rowan (UK: /ˈrəʊən/, US: /ˈroʊən/) and mountain-ash, is a species of deciduous tree or shrub in the rose family. It is a highly variable species, and botanists have used different definitions of the species to include or exclude trees native to certain areas; a recent definition includes trees native to most of Europe and parts of Asia, as well as northern Africa. The range extends from Madeira, the British Isles and Iceland to Russia and northern China. Unlike many plants with similar distributions, it is not native to Japan.

The tree has a slender trunk with smooth bark, a loose and roundish crown, and its leaves are pinnate in pairs of leaflets on a central vein with a terminal leaflet. It blossoms from May to June in dense corymbs of small yellowish white flowers and develops small red pomes as fruit that ripen from August to October and are eaten by many bird species. The plant is undemanding and frost hardy and colonizes disrupted and inaccessible places as a short-lived pioneer species.

The fruit and foliage have been used in the creation of dishes and beverages, as a folk medicine, and as fodder for livestock. Its tough and flexible wood has traditionally been used for woodworking. It is planted to fortify soil in mountain regions or as an ornamental tree and has several cultivars.

Description

''Sorbus aucuparia'' occurs as a tree or shrub that grows up to between in height.Schauer 2001, p. 342 The crown is loose and roundish or irregularly shaped but wide and the plant often grows multiple trunks.Zauner 2000, p. 52Harz 2009, p. 72 A trunk is slender and cylindrical and reaches up to in diameter, and the branches stick out and are slanted upwards.Erlbeck, Haseder, Stinglwagner 1998, p. 166 The bark of a young plant is yellowish gray and gleaming and becomes gray-black with lengthwise cracks in advanced age; it descales in small flakes.Godet 1994, p. 52 Lenticels in the bark are elongated and colored a bright ocher.Godet 2008, p. 110 The plant does not often grow older than 80 years and is one of the shortest-lived trees in temperate climate.Laudert 1999, p. 57 The wood has a wide reddish white sapwood and a light brown to reddish brown heartwood. It is diffuse-porous, flexible, elastic, and tough, but not durable, with a density of in a dried state. The roots grow wide and deep, and the plant is capable of root sprouting and can regenerate after coppicing.

The compound leaves are pinnate with 4 to 9 pairs of leaflets on either side of a terete central vein and with a terminal leaflet. There are paired leaf-like stipules at the base of the petiole. The leaves are up to long, wide, and arranged in an alternate leaf pattern on a branch, distinguishing them from those of ash, ''Fraxinus excelsior'', which are opposite and without stipules. The leaflets are elongated-lanceolate in shape, long, and wide with a sharply serrated edge, and have short stems or sit close to the central vein except for the outermost leaflet.Godet 1994, p. 138 Leaflets are covered in gray-silvery hairs after sprouting but become mostly bare after they unfold.Reichholf, Steinbach 1992, p. 103 Their upper side is dark green and their underside is a grayish green and felted. Young leaflets smell like marzipan when brayed.Hecker 1995, p. 130 The leaflets are asymmetrical at the bottom. The foliage grows in May and turns yellow in autumn or a dark red in dry locations.Smolik 1996, p. 63

The buds are often longer than and have flossy to felted hairs. These hairs, which disappear over time, cover dark brown to black bud scales. The terminal buds are oval and pointed and larger than axillary buds, which are narrow, oval and pointed, close to the twig, and often curved towards it.

The species is monoecious. It reaches maturity at age 10 and carries ample fruit almost every year. The plant flowers from May to June (on occasion again in September) in many yellowish white corymbs that contain about 250 flowers.Kremer 2010, p. 42Raspé, Findlay, Jacquemart 2000, p. 910 The corymbs are large, upright, and bulging.Godet 1998, p. 68 The flowers are between in diameter and have five small, yellowish green, and triangular sepals that are covered in hairs or bare. The five round or oval petals are yellowish white and the flower has up to 25 stamens fused with the corolla to form a hypanthium and an ovary with two to five styles; the style is fused with the receptacle. The flowers have an unpleasant trimethylamine smell. Their nectar is high in fructose and glucose.

Its berry are round pomes between in diameter that ripen from August to October. The fruit are green before they ripen and then typically turn to orange or scarlet in color. The sepals persist as a black, five-pointed star on the ripe fruit.Erlbeck, Haseder, Stinglwagner 1998, p. 167 A corymb carries 80 to 100 pomes.Garcke 1972, p. 722 A pome contains a star-shaped ovary with two to five locules each containing one or two flat, narrow, and pointed reddish seeds. The flesh of the fruit contains carotenoids, citric acid, malic acid, parasorbic acid, pectin, provitamin A, sorbitol, tannin, and vitamin C. The seeds contain glycoside.Hensel 2007, p. 112

The species has a chromosome number of 2''n''=34.Raspé, Findlay, Jacquemart 2000, p. 916

Taxonomy

Fossil record

Fossils of ''Sorbus aucuparia'' have been described from the fossil flora of Kızılcahamam district in Turkey, which is of early Pliocene ''Sorbus aucuparia'' is composed of the Latin words ''sorbus'' for service tree and ''aucuparia'', which derives from the words ''avis'' for "bird" and ''capere'' for "catching" and describes the use of the fruit of ''S. aucuparia'' as bait for fowling. The plant is commonly known as rowan and mountain-ash, and has also been called Amur mountain-ash, European mountain-ash, quick beam, quickbeam, or rowan-berry. The names rowan and mountain ash may be applied to other species in ''Sorbus'' subgenus ''Sorbus'', and mountain ash may be used for several other distantly related trees. The species is not closely related to either the true ash trees (genus ''Fraxinus''), which also carry pinnate leaves, or the species ''Eucalyptus regnans'', also called mountain ash, native to Tasmania and Victoria in southeastern Australia.Breckwoldt 2011, p. 152

The common name mountain ash dates from the 16th century. It was first used by John Gerard in 1597, translating it directly from the then botanists' Latin ''Montana fraxinus''

''S. aucuparia'' was previously categorized as ''Pyrus aucuparia''.Hora 1993, p. 184

''Sorbus aucuparia'' L. belongs to Carl Linnaeus.

Distribution and habitat

''Sorbus aucuparia'' is found in five subspecies:Raspé, Findlay, Jacquemart 2000, p. 911
*''Sorbus aucuparia'' subsp. ''aucuparia'': found in most of the species' range, less in the South
*''Sorbus aucuparia'' subsp. ''fenenkiana'' (Georgiev & Stoj.): has thin, sparsely hairy leaflets and depressed-globose fruit, restricted to Bulgaria
*''Sorbus aucuparia'' subsp. ''glabrata'' ( Wimm. & Grab.): less hairy, found in Northern Europe and Central European mountains
*''Sorbus aucuparia'' subsp. ''praemorsa'' (Guss.): has hairy leaflets and ovoid fruit, found in Southern Italy, Sicily, and Corsica
*''Sorbus aucuparia'' subsp. ''sibirica'' (Hedl.): nearly hairless, found in North Eastern Russia

It can be found in almost all of Europe and the Caucasus up to Northern Russia and Siberia, but it is not native to Southern Spain, Southern Greece, Sardinia, the Balearic Islands, the Azores, and the Faroe Islands.Větvička 1995, p. 200 The species was introduced as an ornamental species in North America. It is widespread from plains to mountains up to the tree line where it grows as the only deciduous tree species among krummholz. In the Alps it grows at elevations of up to . ''S. aucuparia'' appears north of the boreal forest at the arctic tree line; in Norway, it is found up to the 71st parallel north.
It has naturalized in America from Washington to Alaska and eastward in Canada and the northeast of the US very successfully.

''S. aucuparia'' is an undemanding species and can withstand shade. It is frost hardy and can tolerate winter dryness and a brief growing season.Raspé, Findlay, Jacquemart 2000, p. 915 The plant is also resistant to air pollution, wind, and snow pressure.Laudert 1999, p. 80Laudert 1999, p. 83 It mostly grows on soil that is moderately dry to moderately damp, acidic, low on nutrients, sandy, and loose.Godet 2008, p. 378 It often grows in stony soil or clay soil, but also sandy soil or wet peat. The plant grows best on fresh, loose, and fertile soil, prefers average humidity, and does not tolerate saline soil or waterlogging.Aichele, Golte-Bechtle 1997, p. 78 It can be found in light woodland of all kinds and as a pioneer species over fallen dead trees or in clearcuttings, and at the edge of forests or at the sides of roads. The seeds germinate easily, so the plant may appear on inaccessible rock, ruins, branch forks, or on hollow trees.

The tallest ''S. aucuparia'' in the United Kingdom stands in the Chiltern Hills in South East England. This exceptional specimen is tall and has a trunk diameter of . In Germany, an unusually large specimen is located near Wendisch Waren, a village in Mecklenburg-Vorpommern. This tree stands at more than tall, is around 100 years old, and has a diameter of .Ullrich, Kühn, Kühn 2009, p. 29 The tallest known specimen in Ireland is an tall specimen at Glenstal Abbey, County Limerick.

Ecology

The species is pollinated by bees and flies. Its seeds are not digested by birds and are thus propagated by being passed intact in their droppings.Lohmann 2005, p. 60 The fruit are eaten by about 60 bird species and several mammals.Laudert 1999, p. 81 They are liked particularly by thrushes and other songbirds, and are also eaten by cloven-hoofed game, red fox, European badger, dormouse, and squirrel. The fruit are eaten by migratory birds in winter, including Bohemian waxwing, spotted nutcracker, and redwing. Cloven-hoofed game also excessively browse foliage and bark. The plant roots can be found in symbiosis with arbuscular mycorrhizal and less commonly with ectomycorrhizal fungi.

It is usually later superseded by larger forest trees.Lohmann 2005, p. 61 In Central Europe it often grows in association with red elderberry, goat willow, Eurasian aspen, and silver birch. The plant is highly flammable and tends not to accumulate plant litter.Raspé, Findlay, Jacquemart 2000, p. 913

Other species of the genus ''Sorbus'' easily hybridize with ''S. aucuparia'' and hybrid speciation can result; hybrids include '' Sorbus × hybrida'', a small tree with oval serrated leaves and 2 to 3 pairs of leaflets, which is a hybrid with '' Sorbus × intermedia'', and ''S. thuringiaca'', a medium-size tree with elongated leaves and 1 to 3 pairs of leaflets that are sometimes fused at the central vein, which is a hybrid with '' S. aria''.Hora 1993, p. 185–186

The main pests for ''S. aucuparia'' are the apple fruit moth ''Argyresthia conjugella'' and the mountain-ash sawfly '' Hoplocampa alpina''.Friedrich, Schuricht 1989, p. 43Friedrich, Schuricht 1989, p. 44 The rust fungus '' Gymnosporangium cornutum'' produces leaf galls. The leaves are not palatable to insects, but are used by insect larvae, including by the moth '' Venusia cambrica'', the case-bearer moth ''Coleophora anatipennella'', and leaf miners of the genus ''Stigmella''. The snail ''Cornu aspersum'' feeds on the leaves. The plant can suffer from fire blight.Flint 1997, p. 641

Usage

Culinary

The fruit of ''S. aucuparia'' were used in the past to lure and catch birds. To humans, the fruit are bitter, astringent, laxative, diuretic and a cholagogue. They have vitamin C, so they prevent scurvy, but the parasorbic acid irritates the gastric mucosa. Pharmacist Mannfried Pahlow wrote that he doubted the toxicity of the fruit but advised against consuming large amounts.Pahlow 1993, p. 106 The fruit contain sorbitol, which can be used as a sugar substitute by diabetics, but its production is no longer relevant.Laudert 1999, p. 84 ''Sorbus aucuparia'' fruits have been used in the traditional Austrian medicine internally (as tea, syrup, jelly or liqueur) for treatment of disorders of the respiratory tract, fever, infections, colds, flu, rheumatism and gout.

Fresh fruit are usually not tasty, but they can be debittered and made into compote, jelly, jam, a tangy syrup, a tart chutney, or juice, as well as wine and liqueur, or used for tea or to make flour.Henschel 2002, p. 220Dreyer 2009, p. 108 Fruit are served as a side dish to lamb or game. Debittering can be accomplished by freezing, cooking, or drying, which degrades the parasorbic acid. The fruit are red colored in August but usually only harvested in October after the first frost by cutting the corymbs.Breckwoldt 2011, p. 153Pahlow 1993, p. 105 The robust qualities of ''S. aucuparia'' make it a source for fruit in harsh mountain climate and Maria Theresa, ruler of the Habsburg monarchy, recommended the planting of the species in 1779.

A more palatable variety, named ''Sorbus aucuparia'' var. ''dulcis'' Kraetzl, or var. ''edulis'' Dieck, or var. ''moravica'' Dippel, was first discovered in 1810 near Ostružná in the Hrubý Jeseník mountain range of Northern Moravia and became widespread in Germany and Austria the early 20th century.Friedrich, Schuricht 1989, p. 37Friedrich, Schuricht 1989, p. 38 Its leaves are larger and pointed, only the front part of the leaflets is serrated, and they have darker bark, larger buds and larger fruit.Friedrich, Schuricht 1989, p. 40 Similar non-bitter varieties found in Southern Russia were first introduced in Central Europe in 1900 as 'Rossica' and 'Rossica Major', which has large fruit up to in diameter.Friedrich, Schuricht 1989, p. 41

Two widespread cultivars of the Moravian variety are 'Konzentra' and 'Rosina', which were selected beginning in 1946 by the Institut für Gartenbau Dresden-Pillnitz, an agricultural research institute in Saxony, from 75 specimens found mostly in the Ore Mountains, and made available in 1954. Fruit of the more widely used 'Konzentra' are small to medium-sized, mildly aromatic and tart, easier to transport because of their thicker peel, and used for juicing, while fruit of 'Rosina' are larger, sweet and tart, and aromatic, and candied or used in compote.Friedrich, Schuricht 1989, p. 276Friedrich, Schuricht 1989, p. 277 The two cultivars are self-pollinating, yield fruit early, and the sugar content increases while the acid content decreases as the fruit ripen.Fischer 1995, p. 213 'Beissneri' is a cultivar with reddish foliage and bark and serrated leaves. Other edible varieties originate in and are named after Klosterneuburg, Lower Austria.

Russian botanist Ivan Vladimirovich Michurin began in 1905 to crossbreed common ''S. aucuparia'' with other species to create fruit trees. His experiments resulted in the cultivars 'Burka', 'Likjornaja', 'Dessertnaja', 'Granatnaja', 'Rubinovaja', and 'Titan'. Other ''S. aucuparia'' hybrids planted in Western Europe beginning in the 1980s include 'Apricot Queen', 'Brilliant Yellow', 'Chamois Glow', 'Pink Queen', and 'Salmon Queen'.Friedrich, Schuricht 1989, p. 42

The leaves were fermented with leaves of sweet gale and oak bark to create herb beer. Fruits are eaten as a mash in small amounts against lack of appetite or an upset stomach and stimulate production of gastric acid. In folk medicine they are used as a laxative, against rheumatism and kidney disease, and as a gargled juice against hoarseness.

Timber

The wood is used for cartwright's work, turner's work, and woodcarving. Wood can be used from trees as young as 20 years. The sapwood is golden and white, while the heart-wood is brown. In almost treeless regions it is used as firewood. The leaves are sometimes used as fodder for livestock while the fruit are used against erysipeloid infections in domestic pigs and goats. Bark of the plant was used to dye wool brown or red. Honey from the flowers is strongly aromatic and has a reddish color.Friedrich, Schuricht 1989, p. 45

The species is planted in mountain ranges to fortify landslides and avalanche zones.

Ornamental

It is also used as an ornamental plant in parks, gardens, or as an avenue tree. Ornamental cultivars include 'Asplenifolia', which has divided and sharply serrated leaflets, 'Blackhawk', which has large fruit and dark green foliage, 'Fastigiata', which has an upright columnar form, 'Fructu Luteo', which has orange yellow fruit, 'Michred', which has brilliant red fruit, 'Pendula', which is a weeping tree, and 'Xanthocarpa', which has orange yellow fruit.''Enzyklopädie der Garten- und Zimmerpflanzen'' 1994, p. 572Paul, Rees 1990, p. 141

‘Sheerwater Seedling', an upright and slender cultivar, and 'Wisley Gold' with yellow fruits, have received the Royal Horticultural Society's Award of Garden Merit.

Cultivars are vegetatively propagated via cuttings, grafting, or shield budding.

Culture

In the ''Prose Edda'', the Norse god Thor saves himself from a rapid river created by the giantess Gjálp by grabbing hold of a rowan, which became known as "Thor's protection".

In English folklore, twigs of ''S. aucuparia'' were believed to ward off evil spirits and witches. The plant was called "the witch" in England and dowsing rods to find ores were made out of its wood. Twigs were used to drive cattle to the pasture for the first time in spring to ensure their health and fertility.Scherf 2006, p. 58. The wooden shafts of forks and other farm implements were constructed from the species to protect farm animals and production from witches' spells. In weather lore, a year with plentiful rowan fruit would have a good grain harvest but be followed by a severe winter.

In Scottish folklore, boughs of rowan were traditionally taken into cattle byres in May to protect livestock from evil, and rowan trees were planted in pastures for similar purposes.

''S. aucuparia'' is used in the coats of arms of the German municipalities Ebernhahn, Eschenrode, and Hermsdorf, and of the Vysočina Region of the Czech Republic. Rowan is part of the coat of arms of the Metropolitan Borough of Wigan and the logo of both Wigan Athletic and Wigan Warriors.

Footnotes

References

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External links

''Sorbus aucuparia''
- information, genetic conservation units and related resources. European Forest Genetic Resources Programme (EUFORGEN)

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Flora of Asia
Flora of Europe
Flora of Ukraine
Flora of Iceland
Flora of the Alps
Flora of the Pyrenees
aucuparia
Plants described in 1753
Taxa named by Carl Linnaeus