Fine Art

Sorbus aucuparia

Sorbus aucuparia , Photo: Michael Lahanas

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Rosids
Cladus: Eurosids I
Ordoo: Rosales

Familia: Rosaceae
Subfamilia: Amygdaloideae
Tribus: Maleae
Subtribus: Malinae
Genus: Sorbus
Subgenus: S. subg. Sorbus
Species: Sorbus aucuparia
Subspecies: S. a. subsp. aucuparia – S. a. subsp. fenenkiana – S. a. subsp. maderensis – S. a. subsp. pohuashanensis – S. a. subsp. praemorsa – S. a. subsp. sibirica

Sorbus aucuparia L., Sp. Pl. 1: 477. 1753.

Pyrus aucuparia (L.) Gaertn., Fruct. Sem. Pl. 2: 45, t. 87. 1791.

Sorbus aucuparia

Sorbus aucuparia


Linnaeus, C. 1753. Species Plantarum. Tomus I: 477. Reference page.
USDA, ARS, Germplasm Resources Information Network. Sorbus aucuparia in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 07-Oct-06.

Vernacular names
aragonés: Bixorder
azərbaycanca: Adi quşarmudu
беларуская: Рабіна звычайная
български: Офика
català: Moixera de guilla
kaszëbsczi: Jarzëbiôk
čeština: Jeřáb ptačí
чӑвашла: Пилеш
Cymraeg: Criafolen
dansk: Røn
Deutsch: Vogelbeere
dolnoserbski: Wšedna jerjebina
English: European Rowan
Esperanto: Birdokaptista sorbuso
español: Serbal de cazadores
eesti: Harilik pihlakas
euskara: Otsalizar
فارسی: زبان‌گنجشک کوهی
suomi: Kotipihlaja
Nordfriisk: Fögelbei
français: Sorbier des oiseleurs
galego: Capudre
Gaelg: Keirn
hrvatski: Jarebika
hornjoserbsce: Wšědna wjerjebina
magyar: madárberkenye
հայերեն: Արոսի Կուզնեցովի
íslenska: Ilmreynir
italiano: Sorbo degli uccellatori
日本語: セイヨウナナカマド
ქართული: ცირცელი
қазақша: Кәдімгі шетен
Līvõ kēļ: Pīʼlgõz
lombard: Marözen
lietuvių: Paprastasis šermukšnis
latviešu: Parastais pīlādzis
македонски: Офика
Nederlands: Wilde Lijsterbes
norsk nynorsk: Rogn
norsk: Rogn
polski: jarząb pospolity
português: Tramazeira
русский: Рябина
davvisámegiella: Skáhpi
slovenčina: Jarabina vtáčia
slovenščina: Jerebika
Seeltersk: Moaiboom
svenska: Rönn
Türkçe: Kuş üvezi
удмурт: Горд палэзь
українська: Горобина звичайна
walon: Håvurna
中文: 花楸树

Sorbus aucuparia, commonly called rowan (UK: /ˈrəʊən/, US: /ˈroʊən/)[3] 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[4] 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.[4]

S. aucuparia 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.

Fruit and foliage of S. aucuparia have been used by humans 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.
Main article: Rowan § Names

The binomial name 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.[5] The plant is commonly known as rowan and mountain-ash,[6] and has also been called Amur mountain-ash, European mountain-ash, quick beam, quickbeam, or rowan-berry.[7] 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.[8] S. aucuparia was previously categorized as Pyrus aucuparia.[9] The author citation Sorbus aucuparia L. belongs to Carl Linnaeus.

Sorbus aucuparia occurs as a tree or shrub that grows up to between 5 and 15 m in height.[10] The crown is loose and roundish or irregularly shaped but wide and the plant often grows multiple trunks.[11][12] A trunk is slender and cylindrical and reaches up to 40 cm in diameter, and the branches stick out and are slanted upwards.[5] The bark of a young S. aucuparia is yellowish gray and gleaming and becomes gray-black with lengthwise cracks in advanced age; it descales in small flakes.[6][12] Lenticels in the bark are elongated and colored a bright ocher.[13] The plant does not often grow older than 80 years and is one of the shortest-lived trees in temperate climate.[12][14] Wood of S. aucuparia 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 600 to 700 kg/m3 in a dried state.[6] The roots of S. aucuparia grow wide and deep, and the plant is capable of root sprouting and can regenerate after coppicing.[5]

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.[6] There are paired leaf-like stipules at the base of the petiole.[15] The leaves are up to 20 cm long, 8 to 12 cm wide, and arranged in an alternate leaf pattern on a branch,[5] distinguishing them from those of ash, Fraxinus excelsior, which are opposite and without stipules. The leaflets are elongated-lanceolate in shape, 2 to 6 cm long, and 1 to 2.5 cm wide with a sharply serrated edge, and have short stems or sit close to the central vein except for the outermost leaflet.[16] Leaflets are covered in gray-silvery hairs after sprouting but become mostly bare after they unfold.[17] Their upper side is dark green and their underside is a grayish green and felted. Young leaflets smell like marzipan when brayed.[17][18] The leaflets are asymmetrical at the bottom.[12] S. aucuparia foliage grows in May and turns yellow in autumn or a dark red in dry locations.[5][19]

Buds of S. aucuparia are often longer than 1 cm and have flossy to felted hairs.[12] These hairs, which disappear over time, cover dark brown to black bud scales.[20] 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.[13][20]
Many small open cream colored flowers in a bulging corymb.

S. aucuparia is monoecious.[18] It reaches maturity at age 10 and carries ample fruit almost every year.[5] The plant flowers from May to June (on occasion again in September) in many yellowish white corymbs that contain about 250 flowers.[11][21][22] The corymbs are large, upright, and bulging.[23] The flowers are between 8 and 10 mm in diameter and have five small, yellowish green, and triangular sepals that are covered in hairs or bare.[6][22] 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.[6][23] Flowers of S. aucuparia have an unpleasant trimethylamine smell.[18] Their nectar is high in fructose and glucose.[22]

Its fruit are round pomes between 8 and 10 mm in diameter that ripen from August to October.[18] 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.[5][24] A corymb carries 80 to 100 pomes.[25] A pome contains a star-shaped ovary with two to five locules each containing one or two flat, narrow, and pointed reddish seeds.[6][22] The flesh of the fruit contains carotenoids, citric acid, malic acid, parasorbic acid, pectin, provitamin A, sorbitol, tannin, and vitamin C.[26] The seeds contain glycoside.[27]
Mountain-ashes hold their fruit during late fall.
Mountain-ashes, e.g. this one in the Vercors range, hold their fruit late in fall
Young trees, with the typical leaf form visible

Sorbus aucuparia has a chromosome number of 2n=34.[28]
Distribution and habitat
Sorbus aucuparia growing with Mountain Pine in the Italian Alps

Sorbus aucuparia is found in five subspecies:[22][29]

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.[29][30] The species was introduced as an ornamental species in North America.[29] It is widespread from plains to mountains up to the tree line where it grows as the only deciduous tree species among krummholz.[5] In the Alps it grows at elevations of up to 2000 m.[11] S. aucuparia appears north of the boreal forest at the arctic tree line; in Norway, it is found up to the 71st parallel north.[6][29] It has naturalized in America from Washington to Alaska and eastward in Canada and the northeast of the US very successfully.

Sorbus aucuparia is an undemanding species and can withstand shade.[6] It is frost hardy and can tolerate winter dryness and a brief growing season.[31] The plant is also resistant to air pollution, wind, and snow pressure.[32][33] S. aucuparia mostly grows on soil that is moderately dry to moderately damp, acidic, low on nutrients, sandy, and loose.[20] It often grows in stony soil or clay soil, but also sandy soil or wet peat.[5] The plant grows best on fresh, loose, and fertile soil, prefers average humidity, and does not tolerate saline soil or waterlogging.[6][20][34] 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.[5] Seeds of S. aucuparia germinate easily, so the plant may appear on inaccessible rock, ruins, branch forks, or on hollow trees.[5]

The tallest S. aucuparia in the United Kingdom stands in the Chiltern Hills in South East England. This exceptional specimen is 28 m tall and has a trunk diameter of 56 cm.[35] In Germany, an unusually large specimen is located near Wendisch Waren, a village in Mecklenburg-Vorpommern. This tree stands at more than 15 m tall, is around 100 years old, and has a diameter of 70 cm.[36] The tallest known S. aucuparia in Ireland is an 18 m tall specimen at Glenstal Abbey, County Limerick.[37]
Damage caused by game

Sorbus aucuparia is pollinated by bees and flies.[18] Its seeds are not digested by birds and are thus propagated by being passed intact in their droppings.[38] The fruit are eaten by about 60 bird species and several mammals.[39] They are liked particularly by thrushes and other songbirds, and are also eaten by cloven-hoofed game, red fox, European badger, dormouse, and squirrel.[21][24] Fruit of S. aucuparia are used as a food source by migratory birds in winter, including Bohemian waxwing, spotted nutcracker, and redwing.[19] Cloven-hoofed game also excessively browse foliage and bark.[5] The plant roots can be found in symbiosis with arbuscular mycorrhizal and less commonly with ectomycorrhizal fungi.[28][31]

It is usually later superseded by larger forest trees.[40] In Central Europe it often grows in association with red elderberry, goat willow, Eurasian aspen, and silver birch.[40] The plant is highly flammable and tends not to accumulate plant litter.[31][41]

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 Sorbus 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 Sorbus aria.[42]

The main pests for S. aucuparia are the apple fruit moth Argyresthia conjugella and the mountain-ash sawfly Hoplocampa alpina.[43][44] The rust fungus Gymnosporangium cornutum produces leaf galls.[45] 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.[45] The plant can suffer from fire blight.[46]
Fossil record

Fossils of Sorbus aucuparia have been described from the fossil flora of Kızılcahamam district in Turkey, which is of early Pliocene age.[47]

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.[24][34] Pharmacist Mannfried Pahlow wrote that he doubted the toxicity of the fruit but advised against consuming large amounts.[48] The fruit contain sorbitol, which can be used as a sugar substitute by diabetics, but its production is no longer relevant.[49] 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.[50]

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.[24][51][52] Fruit are served as a side dish to lamb or game.[33] Debittering can be accomplished by freezing, cooking, or drying, which degrades the parasorbic acid.[48][52] The fruit are red colored in August but usually only harvested in October after the first frost by cutting the corymbs.[26][53] 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.[33]
Comparison of Sorbus aucuparia fruit from an edible cultivar (left) and a roadside tree (right)

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.[54][55] 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.[56] 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 1.5 cm in diameter.[57]

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 specimen found mostly in the Ore Mountains, and made available in 1954.[57] 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.[58][59] The two cultivars are self-pollinating, yield fruit early, and the sugar content increases while the acid content decreases as the fruit ripen.[60] 'Beissneri' is a cultivar with reddish foliage and bark and serrated leaves.[55] Other edible varieties originate in and are named after Klosterneuburg, Lower Austria.[61]

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'.[57] Other S. aucuparia hybrids planted in Western Europe beginning in the 1980s include 'Apricot Queen', 'Brilliant Yellow', 'Chamois Glow', 'Pink Queen', and 'Salmon Queen'.[62]

The leaves were fermented with leaves of sweet gale and oak bark to create herb beer.[49] Fruit are eaten as a mash in small amounts against lack of appetite or an upset stomach and stimulate production of gastric acid.[48] In folk medicine they are used as a laxative, against rheumatism and kidney disease, and as a gargled juice against hoarseness.[27]
Freshly cross cut sorbus aucuparia with visible heart-wood
Freshly rip cut sorbus aucuparia with visible heart-wood

Wood of S. aucuparia is used for cartwright's work, turner's work, and woodcarving.[5] Wood can be used from trees as young as 20 years.[40] The sapwood is golden and white, while the heart-wood is brown. In almost treeless regions it is used as firewood.[9] The leaves are sometimes used as fodder for livestock while the fruit are used against erysipeloid infections in domestic pigs and goats.[6] Bark of the plant was used to dye wool brown or red.[49] Honey from S. aucuparia flowers is strongly aromatic and has a reddish color.[63]

Sorbus aucuparia is planted in mountain ranges to fortify landslides and avalanche zones.[40]

It is also used as an ornamental plant in parks, gardens, or as an avenue tree.[21] 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.[46][64][65]

‘Sheerwater Seedling',[66] an upright and slender cultivar, and 'Wisley Gold'[67] with yellow fruits, have received the Royal Horticultural Society's Award of Garden Merit.[68]

Cultivars are vegetatively propagated via cuttings, grafting, or shield budding.[64]
Mythology and customs
Main article: Rowan § Mythology and folklore

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".[69]

In English folklore, twigs of S. aucuparia were believed to ward off evil spirits[24] and witches.[70][71][72] The plant was called "the witch" in England and dowsing rods to find ores were made out of its wood.[49] Twigs of S. aucuparia were used to drive cattle to the pasture for the first time in spring to ensure their health and fertility.[73] The wooden shafts of forks and other farm implements were constructed from S. aucuparia, to protect farm animals and production from witches' spells.[70] In weather lore, a year with plentiful rowan fruit would have a good grain harvest but be followed by a severe winter.[24]

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.

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