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Ulmus americana, generally known as ... The trunk may have a diameter at breast height (dbh) of more than 1.2 m ... leading to great size within decades, ...
Most of North America's notable elms are Ulmus americana, a fast-growing and long-lived species capable of attaining great size in a few centuries, especially when open-grown. [1] American Forests, a non-profit conservation organization, uses the following formula to calculate a point score for each tree to permit comparisons with others:
It was steadily weakened by viruses in Europe and had all but disappeared by the 1940s. However, the disease had a much greater and longer-lasting impact in North America, owing to the greater susceptibility of the American elm, Ulmus americana, which masked the emergence of the second, far more virulent strain of the disease Ophiostoma novo-ulmi.
The American Elm cultivar Ulmus americana 'Princeton' was originally selected in 1922 by New Jersey nurseryman William Flemer of Princeton Nurseries for its aesthetic merit. 'Princeton' was later found to have a moderate resistance to Dutch elm disease (DED).
'Moline' is distinguished by its narrow but open form, with a single central trunk likened to a Lombardy Poplar when young, [4] the branches of the older trees being ultimately horizontal. [5] The leaves, of a dark rich shade of green, [ 6 ] could be exceptionally broad, measuring 15 cm across.
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The original tree was of great size, and possessed an extremely pendulous branching habit. [3] It was partly destroyed by fire in the mid-19th century and by storm in 1893. In 1913 its hollow trunk had a bole-girth of 45 ft and was estimated to be at least 400 years old. [4] "