Ulmus pumila

Siberian elm is in the elm or Ulmaceae family and is native to Central Asia, eastern Siberia, the Russian Far East, Mongolia, Tibet, northern China, India (northern Kashmir) and Korea. It was introduced into United States in the early 1900s to replace American elms dying of Dutch elm disease, but later became popular as a shelterbelt tree. It is now naturalized across much of the United States and Canada, and is often an invasive species.

Siberian elm may be confused with Chinese Elm (Ulmus parvifolia), which differs in having flaky trunk bark and flowers that bloom during late summer or autumn. Both of the species are found in some areas in southern portions of North America.

As an ornamental U. pumila tends to be short-lived, with brittle wood and poor crown shape, but it has nevertheless enjoyed some popularity owing to its rapid growth and provision of shade, particularly in hot, dry areas where it thrives and other species don't grow as well. However, it sometimes has been described as "one of the world's worst ornamental trees".

• Leaves are deciduous in cold areas, but semi-evergreen in warmer climates, up to 7 cm long and 3 cm broad, with an oblique base and a coarsely serrated margin, changing from dark green to yellow in autumn.
• Flowers very small, red, develop before leaves; fruit develops in the spring into a tan-colored flat, oval samara. Bark is gray-brown, rough corrugated.