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Ulmus parvifolia, commonly known as the Chinese elm [2] or lacebark elm, is a species native to eastern Asia, including China, India, Japan, Korea, Vietnam, [3] Siberia and Kazakhstan. [4] It has been described as "one of the most splendid elms, having the poise of a graceful Nothofagus ".
A small tree, to 30 or 40 ft tall, with upright, spreading branches, the broad crown developing long, overhanging branchlets when older. [2] The leaves are dark green. [1] 'Drake' is also distinguished by having a bark that begins exfoliating at a relatively young age. [3]
The Indian elm is a large deciduous tree, about 20–25 m tall (rarely over 30 m), with a broad crown featuring several ascending branches. Bark is grey in colour, covered with blisters, peeling in corky scales on old trees.
By 8 to 10 years old, the bark breaks into thick, rough, irregular dark grey scales with deep fissures, the scales being present also on branches. Leaves are around 4 cm long, light green in spring, middle green in summer, turning bright yellow in fall. Tree grows some 20 ft tall and correspondingly wide.
Ulmus parvifolia 'Emer II ' or ' Emerald Vase ' (selling name Allee) is a Chinese Elm cultivar selected by Dr. Michael A. Dirr and cloned in the late 1980s from a tree planted circa 1910 on the University of Georgia campus at Athens, that had survived ice-storms undamaged. [1] [2] It was patented in 1991. [3]
The tree can reach a height of 20 metres (66 ft) with a trunk of about 0.5 m d.b.h. The bark is thick with a pronounced corky layer, and is longitudinally fissured. The branchlets are devoid of the corky wings common to many elms. The leaves are generally narrow, ranging from obovate to elliptic, up to 15 cm long, and densely hirsute when young.
American elm is a vase-shaped, medium to large, deciduous tree. [4] The tree can grow to greater than 30 m in height, and is distinguished by its dense, symmetrical, upright form and dark green foliage, ultimately forming a broad umbrella crown. Crotch angles can be acute, with considerable bark inclusion which can later lead to branch breakages.
Zelkova (from the Georgian dzelkva, 'stone pillar') is a genus of six species of deciduous trees in the elm family Ulmaceae, native to southern Europe, and southwest and eastern Asia. They vary in size from shrubs (Z. sicula) to large trees up to 35 m (115 ft) tall (Z. carpinifolia). The bark is smooth, dark brown.