Ulmus pumila
Siberian elm ( Ulmus pumila )
The Siberian elm ( Ulmus pumila ) or dwarf - elm is a deciduous tree of the genus of the elms. The distribution area extends across the East Siberia and Mongolia to northern China.
Description
The Siberian elm is a deciduous tree or shrub with arched crown, which reaches a height of 10 to 20 meters. The branches are hairy or bald. The bark is deeply fissured. The leaves are elliptic to ovate - lanceolate, firm, 2 to 6 inches long, acute or acuminate with almost symmetrical basis. The leaf margin is almost easy to saw. The upper leaf surface is dark green and glabrous, hairy underside of the weak. There shall be ten to twelve pairs of nerves sunken. The petiole is 2-4 mm long. The flowers are very short -stalked and are in dense clusters. There shall be four to five stamens with purple anthers. Flowering is in April. As fruits globular, 1 to 1.5 inches thick nut fruits are formed. The fruiting body is above the center in a deeply incised edge of wing.
Fruits
Distribution and ecology
The natural range of the Siberian elm extends from eastern Siberia across the Amur region, Central Asia and Mongolia to northern China. There you will find them as steppe and woodland in dry forests on dry to fresh, mildly acidic to strongly alkaline, sandy, sandy- gravelly or sandy- loamy, nutrient-rich soils in full sun to light shade locations. The species is fast growing and resistant to drought. It is regarded as resistant to Dutch elm disease. In the United States and in Canada it was introduced by humans.
System
The Siberian elm ( Ulmus pumila ) is a species of the genus elm (Ulmus ). There she is assigned to the section Ulmus in the subgenus Ulmus. A synonym of the species is Ulmus campestris var pumila Maxim.
In addition to the nominate Ulmus pumila var pumila is the variety Ulmus pumila var arborea distinguished, referred to generally as a synonym as Ulmus turkestanica and construed as a separate species. Their growth is initially cone-shaped, wherein the branches later hang more or less. The leaves are elliptic - ovate to ovate - lanceolate, cut 4-7 inches long and easy.
Use
The Siberian elm is used in the United States for prairie reforestation and windbreaks. In Central Europe the variety arborea is usually planted in parks and gardens.