The Elm tree Ulmus 'Morton Stalwart' (Commendation), is a Morton Arboretum

Morton Arboretum

The Morton Arboretum, in Lisle, Illinois, covers 1,700 acres and is made up of gardens of various plant types and collections of trees from specific taxonomical and geographical areas. It includes native woodlands and a restored Illinois prairie. The Arboretum has over 4,100 different species of...

 hybrid from a controlled crossing of 'Morton' (Accolade) with a Ulmus pumila × U. minor (syn. carpinifolia) from eastern Russia

Russia

Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

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Description

The branches are upright, but the form of the tree is more oval than vase-shaped; the leaves are relatively large. However, examples grown in the warmer climes of the southern United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 have not impressed, and it was dismissed, along with its Morton stablemates 'Morton Glossy' (Triumph) and 'Morton Plainsman' (Vanguard), as 'ugly' by Michael Dirr

Michael Dirr

Michael A. Dirr, Ph.D is a horticulturist and a professor of horticulture at the University of Georgia. He is an expert on woody plants.-Education and Experience:...

, Professor of Horticulture at the University of Georgia

University of Georgia

The University of Georgia is a public research university located in Athens, Georgia, United States. Founded in 1785, it is the oldest and largest of the state's institutions of higher learning and is one of multiple schools to claim the title of the oldest public university in the United States...

 http://www.greenbeam.com/rs/nm_pdfs/16338_013.pdf, on account of its 'wild' growth and splaying branches.

Pests and diseases

Although 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...

, the tree is moderately susceptible to insects, notably 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...

, Japanese beetle

Japanese beetle

The beetle species Popillia japonica is commonly known as the Japanese beetle. It is about long and wide, with iridescent copper-colored elytra and green thorax and head...

  and Gypsy moth

Gypsy moth

The gypsy moth, Lymantria dispar, is a moth in the family Lymantriidae of Eurasian origin. Originally ranging from Europe to Asia, it was introduced to North America in the late 1860s and has been expanding its range ever since...

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Cultivation

'Morton Stalwart' is vigorous and robust, adjudged the third fastest-growing cultivar of 17 assessed by the University of Minnesota

University of Minnesota

The University of Minnesota, Twin Cities is a public research university located in Minneapolis and St. Paul, Minnesota, United States. It is the oldest and largest part of the University of Minnesota system and has the fourth-largest main campus student body in the United States, with 52,557...

 and fourth out of 15 in trials at U C Davis; it is also extremely tolerant of drought and cold. In artificial freezing tests at the Morton Arboretum the tree was found cold-hardy to -40 °C

Celsius

Celsius is a scale and unit of measurement for temperature. It is named after the Swedish astronomer Anders Celsius , who developed a similar temperature scale two years before his death...

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'Morton Stalwart' was introduced by Chicagoland Grows Inc., and is currently being evaluated in the National Elm Trial

National Elm Trial

The National Elm Trial is an American volunteer effort to evaluate a range of newly developed elm cultivars as replacements for elms destroyed by Dutch elm disease...

 coordinated by Colorado State University

Colorado State University

Colorado State University is a public research university located in Fort Collins, Colorado. The university is the state's land grant university, and the flagship university of the Colorado State University System.The enrollment is approximately 29,932 students, including resident and...

. The tree is not known to have been introduced to Europe

Europe

Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally 'divided' from Asia to its east by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways connecting...

 or Australasia

Australasia

Australasia is a region of Oceania comprising Australia, New Zealand, the island of New Guinea, and neighbouring islands in the Pacific Ocean. The term was coined by Charles de Brosses in Histoire des navigations aux terres australes...

.

Accessions

North America

• Arnold Arboretum. Acc. no. 131-2002
• Bickelhaupt Arboretum
  Bickelhaupt Arboretum
  Bickelhaupt Arboretum is a non-profit arboretum located at 340 South 14th Street, Clinton, Iowa. It is open dawn to dusk daily without charge....
  
  . Acc. no. 02-018
• Brenton Arboretum
  Brenton Arboretum
  The Brenton Arboretum 121 acres is a new arboretum and botanical garden in early stages of development, located at 2629 Palo Circle, Dallas Center, Iowa, USA. The Arboretum aims to display all Iowa native trees and shrubs suitable to the site, as well as many other tree species which can grow in...
  
  , Dallas Center, Iowa
  Iowa
  Iowa is a state located in the Midwestern United States, an area often referred to as the "American Heartland". It derives its name from the Ioway people, one of the many American Indian tribes that occupied the state at the time of European exploration. Iowa was a part of the French colony of New...
  
  . 5 trees, acquired 2009. Acc. no. not known.
• Chicago Botanic Garden
  Chicago Botanic Garden
  Located at 1000 Lake Cook Road, Glencoe, Illinois, USA, the Chicago Botanic Garden is a living plant museum situated on nine islands featuring 24 display gardens and surrounded by four natural habitats: McDonald Woods, Dixon Prairie, Skokie River Corridor, and Lakes and Shores. The Garden is open...
  
  , Glencoe
  Glencoe, Illinois
  Glencoe is a village in Cook County, Illinois, United States. As of the 2010 census, the village population was 8,723. Glencoe is located on suburban Chicago's North Shore. Glencoe is located within the New Trier High School District. Glencoe is regarded as one of the most affluent suburbs on...
  
  , 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,...
  
  . 1 tree, planted in the Parking Lots; no other details available.
• Dawes Arboretum
  Dawes Arboretum
  The Dawes Arboretum is a non-profit arboretum located outside of Columbus in Newark, Ohio. As one of the premier public gardens in North America, The Dawes Arboretum has over of plant collections, gardens and natural areas...
  
   http://www.dawesarb.org/collectionsgardens/plant-search.asp, Newark
  Newark, Ohio
  In addition, the remains of a road leading south from the Octagon have been documented and explored. It was first surveyed in the 19th century, when its walls were more apparent. Called the Great Hopewell Road, it may extend to the Hopewell complex at Chillicothe, Ohio...
  
  , Ohio
  Ohio
  Ohio is a Midwestern state in the United States. The 34th largest state by area in the U.S.,it is the 7th‑most populous with over 11.5 million residents, containing several major American cities and seven metropolitan areas with populations of 500,000 or more.The state's capital is Columbus...
  
  . 2 trees, no acc. details available.
• Holden Arboretum
  Holden Arboretum
  The Holden Arboretum, in Kirtland, Ohio, USA, is one of the largest arboretums and botanical gardens in the United States, with over 3,500 acres , 600 acres of which are devoted to collections and gardens. Diverse natural areas and ecologically sensitive habitats make up the rest of the holdings...
  
  . Acc. no. 00-124
• Morton Arboretum
  Morton Arboretum
  The Morton Arboretum, in Lisle, Illinois, covers 1,700 acres and is made up of gardens of various plant types and collections of trees from specific taxonomical and geographical areas. It includes native woodlands and a restored Illinois prairie. The Arboretum has over 4,100 different species of...
  
  . Acc. nos. 274-97, 109-2006.
• Smith College
  Smith College
  Smith College is a private, independent women's liberal arts college located in Northampton, Massachusetts. It is the largest member of the Seven Sisters...
  
  . Acc. no. 36405
• University of Idaho
  University of Idaho
  The University of Idaho is the State of Idaho's flagship and oldest public university, located in the rural city of Moscow in Latah County in the northern portion of the state...
  
  Arboretum. Two trees. Acc. no. 2000089