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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.
Bark and leaf. It is the most widely distributed of all the American ashes; its range centers on the midwestern U.S. and Great Plains. Seedlings of the tree have a high tolerance to water logging [12] which may explain why the natural habitat of green ash is almost exclusively stream sides and bottomlands.
Ulmus rubra is a medium-sized deciduous tree with a spreading head of branches, [4] commonly growing to 12–19 metres (39–62 feet), very occasionally over 30 m (98 ft) in height. Its heartwood is reddish-brown.
The American elm is a deciduous tree which, under ideal conditions, can grow to heights of 21 to 35 meters (69 to 115 feet). [3] The trunk may have a diameter at breast height (dbh) of more than 1.2 m (4 ft), supporting a high, spreading umbrella-like canopy.
The perfect apetalous, wind-pollinated flowers are red-green and appear in racemes up to 40 mm (2 in) long two weeks before the leaves from March to May, depending on the tree's location. The fruit is a broad ovate samara 13–25 mm ( 1 ⁄ 2 – 31 ⁄ 32 in) long covered with fine hair, notched at the tip, and maturing during May or June to ...
The tree succumbed to Dutch elm disease and was felled in 1968. A ring count established that it had begun life in the year 1701. [61] The "Great Elm Tree" at Phillips Academy in Andover, Massachusetts is believed to have been standing for at least 200 years. It is being well cared for and receives regular treatments for Dutch elm disease.
The true ash trees are much taller and are typically grown as street trees or shade trees. The smaller mountain ash is a member of the rose family while the true ash belongs to the olive family.
The largest recorded tree in the UK grew at Great Amwell, Hertfordshire, measuring 40 m in height and 228 cm d.b.h. in 1911. [43] Another famous specimen was the great elm that towered above its two siblings at the bottom of Long Melford Green, Long Melford, Suffolk, [44] till the group succumbed to disease