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The most common trees in Poland In Poland, there are over 70 naturally growing tree species from 31 genera. Six species are under strict protection. Sixteen species are widespread in forests, river valleys, and wastelands. They are frequently planted in urban parks and along roads. The common oak, pedunculate oak Quercus robur L. is a deciduous tree from the family Fagaceae. It occurs in Europe (except for northern Scandinavia) and south-eastern Asia. It forms its own associations, i.e. oak forests, or grows in mixed forests. The tree reaches a height of 30 m. It has palmate leaves and anemophilous flowers. Male flowers are clustered in pendulous inflorescences – catkins. The fruits, commonly called acorns, form a cluster of 2-3 on a 2-5 cm-long peduncles. The oak is a long-lived species reaching 700 years of age, which is the longest of all Polish deciduous trees. Therefore, the oak is often planted as a commemorative tree. It is a symbol of longevity, dignity, and strength. Old specimens are protected as nature monuments. Bartek oak tree is the best-known tree in Poland. This 700-year-old tree grows between Bartków and Zagańskie in Świętokrzyskie Voivodeship. The oak is highly valued for its durable, hard, and long-lasting wood used in the construction industry and production of furniture. Oak wood has a high burning value. The pedunculate oak and its varieties are planted in parks and along city streets. The small-leaved linden Tilia cordata Mill. is a tree species from the family Tiliaceae. It originates from Europe and western Asia. In Poland, it is widespread across the country. It grows in natural localities, and it is frequently planted near houses, in parks, and along roads as an ornamental and usable plant. 18th- and 19th-century linden alleys have remained up to the present day. The small-leaved linden is a large deciduous tree reaching a height of 30 m. It is a long-lived species able to live as long as a thousand years. It has cordate leaves and the yellow flowers emit a nice honey aroma. The fruit is a globular, hard, and glabrous winged nut. The linden is a valuable honey-bearing plant. Linden honey and linden flower tea has medicinal importance and is applied to treat colds. Linden charcoal has medicinal application as well and the soft wood is used in sculpture. The Norway maple Acer platanoides L. is a species from the family Aceraceae widespread in central and eastern Europe and south-western Asia. It is the most common native species from this genus in Poland. The Norway maple is resistant to air pollution; therefore, its varieties are commonly planted in urban areas. The tree reaches a height of 20-30 meters. It has palmate leaves, flowers gathered in corymbs, and a samara fruit. The wing facilitates dispersal of seeds by wind. The wood of the Norway maple is suitable for processing and is used for production of furniture, flooring, and musical instruments. The common ash Fraxinus excelsior L. is a tree species from the family Oleaceae. It occurs naturally across a major part of Europe and western Asia. It is widespread across the entire area of Poland. The tree reaches a height of 30 m and lives about 300 years. The leaves are composed of 9-15 leaflets. Its tiny flowers form a panicle. The fruit is a samara (a winged nut). With its cholagogic and diuretic properties, the common ash is a medicinal plant. Its valuable wood is used for production of furniture, flooring, and sport equipment. The common birch Betula pendula Roth is a tree species from the family Betulaceae. It grows in cool regions of Asia and Europe, and in northern Africa. It is widespread across the entire area of Poland. The tree grows on dry and sandy land, wasteland, in deciduous forests, mixed coniferous and pine forests, shrubland and thickets, and along railway tracks. The common birch is an important forest tree. It reaches a height of 30 m and lives ca. 100 years. The crown is well developed with thin drooping branchlets. The bark is white in young trees, whereas in older specimens it is black at the base. The leaves are triangular and the anemophilous flowers are gathered in inflorescences called catkins. The fruits are oblong winged nuts. The common birch is a medicinal plant; its sap has strengthening, diuretic, and detoxifying properties. Birch wood is used for producing furniture, flooring, and matches. Its ornamental varieties are frequently planted in parks and gardens. Birch pollen causes allergies in humans. Thin birch branches are used in saunas. The European beech Fagus sylvatica L. is a tree species from the family Fagaceae. It is widespread in the nature across almost entire Europe (except for the southwestern part). In western and southern Poland, the European beech is the major component of forests. The tree reaches a height of ca. 25-30 m and the age of ca. 350 years. The bark is smooth and grey and the leaves are oval or elliptic. The flowers are anemophilous. Male inflorescences are gathered in a capitula drooping from long peduncles. The fruit – nuts encircled by a hairy capsule – are willingly eaten by boars. The hard and heavy beech wood is used for production of furniture and flooring, barrels, sport equipment, and everyday objects. Beech wood is also used for production of paper and charcoal. It has a great calorific value. The European beech is an ornamental species, whose many ornamental varieties are planted in parks and along roads. The hornbeam Carpinus betulus L. is a medium-sized tree from the family Betulaceae. It is widespread in Europe and the Caucasus. In Poland, it is common across the country. The tree reaches a height of 25 m. Its lifespan is ca. 150 years. It has a dense crown, elliptic leaves, flowers gathered in a raceme, and winged nut fruits. The hornbeam is an ornamental plant planted in parks and urban areas. It perfectly tolerates pruning; therefore, it is widely used as a hedge. Its wood is hard, heavy, and elastic; it is used for production of musical instruments and as fuel. The grey alder Alnus glutinosa Gaertn. is a tree species from the family Betulaceae. It is widespread across the entire area of Europe, in western Syberia, and north-western Africa. The black alder grows on moist banks of water bodies. The tree reaches a height of up to 40 m and lives approximately 120 years. The leaves are obovate and the flowers form pendulous inflorescences – catkins. The fruit is a small, dark brown nut equipped with tiny wings. Alder wood is light, soft, and water resistant. It is used for production of furniture, fences, and objects exposed to permanent contact with water. It can also be used as fuel. The bark produces a black pigment and tannins. The European white elm, spreading elm Ulmus laevis is a tree species from the family Ulmaceae. It is widespread in central, eastern, and south-eastern Europe as far as the Caucasus. It is common in Poland. It grows in riparian forests in associations with poplars and willows. The tree reaches a height of 35-40 m. It has elliptic, asymmetrical leaves. The flowers are located on drooping peduncles. The fruit is a flattened nut encircled by a wing. The water-resistant wood is fairly hard and heavy. The white elm and its varieties are commonly planted in parks. The rowan, rowan-tree Sorbus aucuparia L. is a deciduous tree species from the family Rosaceae. It is widespread in Europe and south-eastern Asia. Across Poland, it is common in forests and thickets. It reaches a height of 15 m and lives 80-100 years. The leaves are composed of 9–15 leaflets. The flowers are gathered in dense umbels. The fruits are globular, red-coloured, and tart-flavoured. This species is often planted in parks and gardens, as there are ornamental forms of the tree. The fruits contain great amounts of vitamin C, P, and K, provitamin A, and carotene, whose content is twice as greater than that in carrots. They exhibit strengthening and diuretic properties. The fruit can be preserved as juice and jam. The wood is used for production of musical instruments. The crack willow, Bedford willow, varnished willow, snap willow Salix fragilis L. is a tree species from the family Salicaceae. It is widespread in Europe and Asia. It is one of the most common trees in Poland. It grows in riparian forests in associations with poplars, and along roads and pond banks. The tree reaches a height of 20 m. It is a short-lived tree. It has lanceolate leaves and flowers gathered in pendulous inflorescences – catkins. The fruit capsule contains tiny hairy seeds. The wood is very soft and it decays easily. The tree is a medicinal plant; the bark contains salicin, which has antipyretic activity. Additionally, the willow bark has potent anti-arthritic activity. Thanks to its expanded root system and rapid growth, the tree is suitable for land reclamation. The Abele, white poplar Populus alba L. is a tree species from the family Salicaceae. Its native range of occurrence includes central and southern Europe, a large part of Asia, and northern Africa. In Poland, it is a wild species widespread across the country; additionally, it is often planted. Most frequently, the white poplar can be found in the large river valleys. This 28-m high tree may live as long as 150 years. The bark of young trees is greywhite, and that of older trees is black. The abaxial surface of its palmate leaves is covered by white trichomes. The anemophilous flowers form inflorescences called catkins. The fruit is a capsule. The poplar has soft, light, cleavable, and easily decaying wood, which contains substantial amounts of water. The wood is used for production of pencils, matches, and paper, as well as in sculpture. Poplar is a medicinal plant. Its buds have a diuretic, slightly diaphoretic, and antipyretic effect. Poplar pollen causes allergies in humans. The Scots pine, common pine, wild pine Pinus sylvestris L. is an evergreen coniferous tree from the family Pinaceae. It is widespread across northern and central Europe and eastern Siberia, where it forms mixed forests or pure pine forests. The Scots pine tolerates sandy and sunny localities. It reaches a height of 30 m. The leaves - needles - are clustered in a set of 2 on short shoots and remain on the tree from 3 to 6 years. Female flowers form cone inflorescences. The Scots pine is an anemophilous plant. Pinewood is one of the major building materials. It is also used as furniture material, fuel, and for production of cellulose. Pinewood contains resin and is a medicinal plant. With their antibacterial and expectorant activity, young pine shoots, needles, wood, and resin constitute a herbal raw material. The Norway spruce, common spruce, European spruce Picea abies (L.) H.Karst is a coniferous tree from the family Pinaceae. It is the only species of spruce naturally occurring in Poland. It grows mainly in the north-eastern part of the country and in the mountains of southern Poland. The geographical range of the species extends from Norway to Russia in the north of Europe to the Alps, the Sudeten, the Carpathians, and the Balkans. It is a component of spruce forests. The tree reaches a height of 40–50 m and lives ca. 300 years. The leaves are short needles that remain on the tree for 5-7 years. Female flowers form pendulous cone inflorescences (10–15 cm). Spruce wood is mainly used in the construction industry and the cellulose-paper industry. It is also used for production of musical instruments. The common spruce is an ornamental plant; its numerous varieties are planted in parks and gardens. The silver fir, European silver fir, common silver fir Abies alba Mill. is a coniferous tree from the family Pinaceae. The common silver fir grows in the wild in the mountains of central and southern Europe. In Poland, the most magnificent fir forests grow in the Świętokrzyskie Mountains and the Carpathians, e.g. on Babia Góra. The tree is a component of fir forests or mixed fir-beech forests. In our conditions, the common fir reaches a height of 50 m. The leaves are flattened needles with two white stripes on the abaxial side. Female flowers form erect 15 cm-long cone inflorescences. Fir wood is mainly used in the construction industry and the cellulosepaper industry. Fir is also a medicinal plant, whose raw material from annual shoots is used in treatment of rheumatoid arthritis and pharyngeal and bronchial inflammation. Cones provide oil for the perfumery industry. The European larch, common larch Larix decidua Mill. is a coniferous tree from the family Pinaceae. The original locality of the species was the mountains of central Europe (the Alps, the Carpathians), but it has been distributed to other areas through planting. The only natural habitats in Poland are located in the Tatra Mountains. Moreover, the species is widely cultivated across the country. It reaches a height of 45 m and lives for 600 years. The common larch is the only coniferous tree shedding leaves before winter. The light green, delicate, and non-prickly needles grow in clusters of 20–40 on short shoots. The larch is an anemophilous plant. Female flowers form small ca. 5 cm-long cone inflorescences. This ornamental plant is willingly planted in house gardens and parks. It is also suitable for hedges (it tolerates pruning). Larch wood is used in the construction industry. Larch churches and mansions originating from the 16th and 18the centuries have survived until the present day. Larch wood is also used for production of furniture and flooring, while the bark – for production of turpentine. Agnieszka Dąbrowska