Tilia


Tilia is a genus of about 30 species of trees or bushes, native throughout most of the temperate Northern Hemisphere. In the British Isles, they are commonly called lime trees, or lime bushes, although they are not closely related to the tree that produces the lime fruit. Other names include linden for the European species, and basswood for North American species. The genus occurs in Europe and eastern North America, but the greatest species diversity is found in Asia. Under the Cronquist classification system, this genus was placed in the family Tiliaceae, but genetic research summarised by the Angiosperm Phylogeny Group has resulted in the incorporation of this genus, and of most of the previous family, into the Malvaceae.
Tilia species are mostly large, deciduous trees, reaching typically tall, with oblique-cordate leaves across. As with elms, the exact number of species is uncertain, as many of the species can hybridise readily, both in the wild and in cultivation. Limes are hermaphroditic, having perfect flowers with both male and female parts, pollinated by insects.

Name

The genus is generally called "lime" or "linden" in Britain and "linden", "lime", or "basswood" in North America.
"Lime" is an altered form of Middle English lind, in the 16th century also line, from Old English feminine lind or linde, Proto-Germanic *lindō, cognate to Latin lentus "flexible" and Sanskrit latā "liana". Within Germanic languages, English "lithe", German lind "lenient, yielding" are from the same root.
"Linden" was originally the adjective, "made from linwood or lime-wood" ; from the late 16th century, "linden" was also used as a noun, probably influenced by translations of German romance, as an adoption of Linden, the plural of German Linde.
Neither the name nor the tree is related to the citrus fruit called "lime". Another common name used in North America is basswood, derived from bast, the name for the inner bark. Teil is an old name for the lime tree.
Latin tilia is cognate to Greek πτελέᾱ, ptelea, "elm tree", τιλίαι, tiliai, "black poplar", ultimately from a Proto-Indo-European word *ptel-ei̯ā with a meaning of "broad" ; perhaps "broad-leaved" or similar.

Description

The Tilia sturdy trunk stands like a pillar and the branches divide and subdivide into numerous ramifications on which the twigs are fine and thick. In summer, these are profusely clothed with large leaves and the result is a dense head of abundant foliage.
The leaves of all the Tilia species are heart-shaped, and most are asymmetrical. The tiny, pea-like fruit hangs attached to a ribbon-like, greenish-yellow bract whose apparent purpose is to launch the ripened seed clusters just a little beyond the parent tree. The flowers of the European and American Tilia species are similar, except the American ones bear a petal-like scale among their stamens and the European varieties are devoid of these appendages. All of the Tilia species may be propagated by cuttings and grafting, as well as by seed. They grow rapidly in rich soil, but are subject to the attack of many insects. Tilia is notoriously difficult to propagate from seed unless collected fresh in fall. If allowed to dry, the seeds go into a deep dormancy and take 18 months to germinate.
In particular, aphids are attracted by the rich supply of sap, and are in turn often "farmed" by ants for the production of the sap, which the ants collect for their own use, and the result can often be a dripping of excess sap onto the lower branches and leaves, and anything else below. Cars left under the trees can quickly become coated with a film of the syrup thus dropped from higher up. The ant/aphid "farming" process does not appear to cause any serious damage to the trees.

History

In Europe, some linden trees reached considerable ages. A coppice of T. cordata in Westonbirt Arboretum in Gloucestershire is estimated to be 2,000 years old. In the courtyard of the Imperial Castle at Nuremberg is a Tilia, which by tradition recounted in 1900, was planted by the Empress Cunigunde, the wife of Henry II of Germany circa 1000. The Tilia of Neuenstadt am Kocher in Baden-Württemberg, Germany, was estimated at 1000 years old when it fell. The Alte Linde tree of Naters, Switzerland, is mentioned in a document in 1357 and described by the writer at that time as already magnam. A plaque at its foot mentions that in 1155, a linden tree was already on this spot. The Najevnik linden tree, a 700-year-old T. cordata, is the thickest tree in Slovenia.
The linden is recommended as an ornamental tree when a mass of foliage or a deep shade is desired. The tree produces fragrant and nectar-producing flowers, and the medicinal herb lime blossom. They are very important honey plants for beekeepers, producing a very pale, but richly flavoured monofloral honey. The flowers are also used for herbal teas and tinctures; this kind of use is particularly popular in Europe and also used in North American herbal medicine practices.

Wood

Linden trees produce soft and easily worked timber, which has very little grain and a density of 560 kg/m3. It was often used by Germanic tribes for constructing shields. It is a popular wood for model building and for intricate carving. Especially in Germany, it was the classic wood for sculpture from the Middle Ages onwards and is the material for the elaborate altarpieces of Veit Stoss, Tilman Riemenschneider, and many others. In England, it was the favoured medium of the sculptor Grinling Gibbons. The wood is used in marionette- and puppet-making and -carving. Having a fine, light grain and being comparatively light in weight, it has been used for centuries for this purpose; despite the availability of modern alternatives, it remains one of the main materials used.
Ease of working and good acoustic properties also make limewood popular for electric and bass guitar bodies and for wind instruments such as recorders. Percussion manufacturers sometimes use Tilia as a material for drum shells, both to enhance their sound and for their aesthetics.
Limewood is also the material of choice for window blinds and shutters. Real-wood blinds are often made from this lightweight but strong and stable wood, which is well suited to natural and stained finishes.

Bark

Known in the trade as basswood, particularly in North America, its name originates from the inner fibrous bark of the tree, known as bast. A strong fibre is obtained from the tree by peeling off the bark and soaking it in water for a month, after which the inner fibres can be easily separated. Bast obtained from the inside of the bark of the Tilia japonica tree has been used by the Ainu people of Japan to weave their traditional clothing, the attus. Recent have shown that "lime tree fibre" was preferred for clothing there during the Bronze Age. Similar fibres obtained from other plants are also called bast: see Bast fibre.

Herbalism

The dried flowers are mildly sweet and sticky, and the fruit is somewhat sweet and mucilaginous. Limeflower tea has a pleasing taste, due to the aromatic volatile oil found in the flowers. The flowers, leaves, wood, and charcoal are used for medicinal purposes. Active ingredients in the Tilia flowers include flavonoids and volatile oils. The plant also contains tannins that can act as an astringent.
Linden flowers are used in herbalism for colds, cough, fever, infections, inflammation, high blood pressure, and headache, and as a diuretic, antispasmodic, and sedative. In the traditional Austrian medicine, Tilia spp. flowers have been used internally as tea for treatment of disorders of the respiratory tract, fever, and flu. New evidence shows that the flowers may be hepatoprotective. The wood is used for liver and gallbladder disorders and cellulitis. That wood burned to charcoal is ingested to treat intestinal disorders and used topically to treat edema or infection such as cellulitis or ulcers of the lower leg.

Other uses

Usually, the double-flowered species are used to make perfumes. The leaf buds and young leaves are also edible raw.
Tilia species are used as food plants by the larvae of some Lepidoptera; see List of Lepidoptera that feed on Tilia.

Classification

This list comprises the most widely accepted species, hybrids, and cultivars".
, England
, Vogelsberg Mountains

Species