There are between 20 to 45 species of elm; the ambiguity in the number is a result of difficult species delimitations in elms, due to the ease of hybridisation between them and the development of local seed-sterile vegetatively-propagated microspecies in some areas, mainly in the field elm group.
In Australia, introduced elm trees are sometimes used as food plants by the larvae of hepialid moths of the genus Aenetus.
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