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American Elm
Ulmus americana
Non-nativeDeciduousAngiospermLarge (30m or more)Endangered
Introduction

This species has been devastated in its natural range by DED, and even before the advent of the pathogen, never really thrived in north-west Europe. Now of interest in breeding programmes developing DED-resistant cultivars. Introduced to Europe in 1752.

Distribution

Native to eastern North America.

Biology

Monoecious. Wind-pollinated. Wind-dispersed.

Identification

Tall (35m), buds ovoid, leaves with little down and broadest above the middle, slightly asymmetrical at base, samaras with deep notch to seed.

Culture

The cultivar Ulmus americana 'Princeton' was once marketed as moderately resistant to DED, but it soon proved undeterred by the Larger Elm Bark Beetle (Scolytus scolytus), which is absent from North America. However, other promising disease-resistant cultivars are emerging, including 'Valley Forge'.

Biodiversity

No notable associations where introduced.

Threats

Highly susceptible to DED. In North America, Elm Yellows is another serious pathogen.

Uses

Ornamental.

Related news
Key
Native statusNon-native
Foliage typeDeciduous
Tree groupAngiosperm
Size classLarge (30m or more)
Conservation status (IUCN)Endangered
Classification
DivisionAngiospermae
OrderRosales
FamilyUlmaceae
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