 | Large-fruited Elm - Ulmus macrocarpa Elm Family: Ulmaceae. This species has been assessed by the Morton Arboretum and is considered suitable for shade tree planting in North America. It is the most cold-hardy of the elms. [Cirrus Home] [Tree Encyclopedia] [Trees Alphabetic Table of Contents] [Family Ulmaceae Table of Contents] [Family Ulmaceae Main Page Graphics] |
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| The Large-fruited Elm is a deciduous tree or large shrub endemic to the Far East. It is notable for its tolerance of drought and extreme cold and is the predominant vegetation on the dunes of the Korqin sandy lands in the Jilin province of north-eastern China, making a small tree at the base of the dunes, and a shrub at the top. The common name is from Latin macrocarpa, in reference to its large, orbicular, wafer-like samarae, up to 50mm in diameter. The tree can reach a height of 17 m, with a slender trunk. The bark is longitudinally fissured, and dark grey in colour. The twigs often develop corky wings that may persist for several years. The leaves are usually obovate, less than 9 cm long, characterized by their thick, leathery texture. The wind-pollinated apetalous flowers appear from March until May, and the seeds from April to June. Possessed of a moderate resistance to Dutch elm disease and a low susceptibility to Elm Yellows, it has also proven very resistant to the elm leaf beetle, Xanthogaleruca luteola, in trials in Oklahoma. |
Ulmus macrocarpa, Morton Arboretum accession 589-54*3, from a graft, is 54 years old and about 35 feet tall.
Large-fruited Elm Foliage
| In May of 2008, almost every elm species at the Morton Arboretum showed signs of stress with extensive holes in its foliage. I'm not sure what causes this or if it is perhaps normal. |
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