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Scientific classification
Kingdom: Plantae
Division: Magnoliophyta
Class: Magnoliopsida
Order: Urticales
Family: Ulmaceae[?]
Genus: Ulmus
  Ulmus alata - winged elm
  Ulmus americana - American elm
  Ulmus crassifolia - cedar elm
  Ulmus glabra - Scotch elm
  Ulmus parvifolia - Chinese elm
  Ulmus procera - English elm
  Ulmus pumila - Siberian elm
  Ulmus rubra - slippery elm (red elm)
  Ulmus thomasii - rock elm

Elms are trees of the genus Ulmus, family Ulmaceae. They have alternate, simple, doubly-serrate leaves, usually with uneven bases. The fruit is a round samara.

The Dutch elm disease, accidentally introduced into the United States, has been devastating to American elms planted in cities. This is a fungal disease that is borne by a vector, the elm-bark beetle. It affects all species of elm native to North America to some degree. Woodland trees are not quite as susceptible to the disease because they usually lack the root-grafting of the urban elms and are somewhat more isolated from each other.

Native species of elm in the eastern United States are:

  • Ulmus alata -- winged elm
  • Ulmus americana -- American elm
  • Ulmus rubra -- slippery elm (or red elm)
  • Ulmus serotina -- September elm
  • Ulmas thomasii -- rock elm

Non-native elms sometimes planted in the U. S. include:

  • Ulmus pumila -- Siberian elm
  • Ulmus glabra -- Scotch elm
  • Ulmus procera -- English elm

Another important genus in the Ulmaceae is the genus Celtis, or hackberry[?].

Elm is also a text-based email client. See Elm email client.

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