The American hybrid cultivar

Cultivar

A cultivar'Cultivar has two meanings as explained under Formal definition. When used in reference to a taxon, the word does not apply to an individual plant but to all those plants sharing the unique characteristics that define the cultivar. is a plant or group of plants selected for desirable...

 Ulmus 'Lincoln' was selected from crossings of the Siberian Elm Ulmus pumila and the Slippery, or Red, Elm Ulmus rubra

Ulmus rubra

Ulmus rubra, the Slippery Elm, is a species of elm native to eastern North America...

made in Illinois

Illinois

Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...

 circa 1958 and patented in 1983.

Description

'Lincoln' is distinguished by retention of its dark-green leaves well into autumn http://www.hort.uconn.edu/plants/u/ulmpum/ulmpum1.html.

Pests and diseases

Although reported (in patent) to be resistant to Dutch elm disease

Dutch elm disease

Dutch elm disease is a disease caused by a member of the sac fungi category, affecting elm trees which is spread by the elm bark beetle. Although believed to be originally native to Asia, the disease has been accidentally introduced into America and Europe, where it has devastated native...

, it has not been widely tested . In trials in Oklahoma

Oklahoma

Oklahoma is a state located in the South Central region of the United States of America. With an estimated 3,751,351 residents as of the 2010 census and a land area of 68,667 square miles , Oklahoma is the 28th most populous and 20th-largest state...

, the clone was heavily to severely damaged by the Elm Leaf Beetle Xanthogaleruca luteola

Xanthogaleruca luteola

Xanthogaleruca luteola, commonly known as the Elm Leaf Beetle, is a serious pest of the elm. Indigenous to Europe, it was accidentally introduced to North America. Both the imagines and larvae feed on the emergent leaves of the elm...

http://www.sunshinenursery.com/survey.htm.

Cultivation

Reputed to be a very cold-hardy [Zone 3] tree. 'Lincoln' is not known to be in cultivation beyond North America

North America

North America is a continent wholly within the Northern Hemisphere and almost wholly within the Western Hemisphere. It is also considered a northern subcontinent of the Americas...

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