Cormus domestica
Cormus domestica, commonly known as service tree or sorb tree, is a species of tree native to western, central and southern Europe, northwest Africa, and southwest Asia. It may be called true service tree, to distinguish it from the wild service tree. It is the only species in the monotypic genus Cormus.
Image:Sorbus domestica.JPG|thumb|Foliage and fruit
It is a deciduous tree growing to tall with a trunk up to diameter, though it can also be a shrub tall on exposed sites. The bark is brown, smooth on young trees, becoming fissured and flaky on old trees. The winter buds are green, with a sticky, resinous coating. The leaves are long, pinnate with 13–21 leaflets long and broad, with a bluntly acute apex, and a serrated margin on the outer half or two thirds of the leaflet. The flowers are diameter, with five white petals and 20 creamy-white stamens; they are produced in corymbs diameter in late spring, and are hermaphrodite and insect pollinated. The fruit is a human-edible pome called the "serviceberry" that is long, greenish-brown, and often tinged red on the side exposed to sunlight; it can be either apple-shaped or pear-shaped.
Ecology
Cormus domestica is generally rare, listed as an endangered species in Switzerland and Austria, and uncommon in Spain. In the UK, one very old tree that existed in the Wyre Forest before being destroyed by fire in 1862 used to be considered native, but it is now generally considered to be more likely of cultivated origin, probably from a mediaeval monastery orchard planting. More recently, a small population of genuinely wild specimens was found growing as stunted shrubs on cliffs in south Wales and nearby southwest England. It is a very rare species in Britain, occurring at only a handful of sites. Its largest English population is within the Horseshoe Bend Site of Special Scientific Interest at Shirehampton, near Bristol.A further population has been discovered growing wild in Cornwall on a cliff in the upper Camel Estuary.
It is a long-lived tree, with ages of 300–400 years estimated for some in Britain.
One of the largest and probably oldest known specimens in Europe is on an educational trail near the town of Strážnice in the province of Moravia, Czech Republic. Its trunk measures in circumference, with a crown high and across. It is estimated to be around 450 years old.
Cultivation and uses
The fruit is a component of a cider-like drink which is still made in parts of Europe. Picked straight off the tree, it is highly astringent and gritty; however, when left to blet it sweetens and becomes pleasant to eat. In the Moravian Slovakia region of the Czech Republic, there is a community-run museum with an educational trail and a festival for this tree, with products like jam, juice and brandy made from its fruit.The sorb tree is cited in the Babylonian Talmud in Ketubot 79a. The example refers in Jewish Babylonian Aramaic to a "thicket of zardəṯā".
In ancient Greece, the fruit was cut in half and pickled, which in Plato's Symposium has Aristophanes use as a metaphor for the cutting in half of the original spherical humans by Zeus.
Service tree wood was often used for manufacturing wooden planes of all types used for working wood, because servicetree wood is fairly dense and holds a profile well.