Smooth-leaved Elm - Ulmus carpinifolia 'Wredei' and 'Koopmanii' [1][2]
Elm Family: Ulmaceae. Trade Names: Wrede Smooth-leaved Elm, Wrede Smoothleaf Elm, Koopman's Smooth-leaved Elm
Range: cultivated.
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Smooth-leaved Elm - Ulmus carpinifolia 'Wredei'
Wrede Smooth-leaved Elm

Native to Europe, North Africa and western Asia, this elm will grow 70 to 90 feet. Its leaves are relatively small and smooth to the touch.

Cultivars/Varieties

As well as the two varieties pictured here, listed here are several direct selections of this species, as well as several hybrids that include U. carpinifolia as a parent.

'Frontier' - A hybrid selection, this plant expresses moderate resistance to disease. It is an oval-upright tree that grows to 40' tall with a narrower spread. The glossy summer foliage turns reddish in fall.

'Homestead' - Resistant to Dutch elm disease and elm yellows, this hybrid tree assumes an upright-oval habit with symmetrical branching to 60' tall and 40' wide. The dark green foliage turns yellow in fall, and the plants grows quickly and is suitable as a street tree.

'Pioneer' - This hybrid expresses good resistance to most ailments that plague elms. It grows quickly to form a rounded tree to 60' tall and wide. The attractive summer foliage is dark green, turning yellow in fall.

'Regal' - A complex hybrid selection, this tree is resistant to Dutch elm disease. From an ornamental perspective, however, the plant leaves much to be desired. The open, upright growth habit (to 60' tall and perhaps 30' wide) is not as pleasing as most elm selections. The leaves also lack the strong green color and glossy sheen of many other cultivars.

'Sarniensis' - This is a selection of U. carpinifolia that forms a narrow, upright tree. Though the foliage is dark green and the tree is handsome when healthy, it appears somewhat prone to Dutch elm disease infection.

'Umbraculifera' - A form of U. carpinifolia, this form is usually grafted as a standard to form a small rounded tree with dense branching. It may grow 20' to 30' tall.

'Variegata' - Sometimes offered by specialty nurseries, this variety of U. carpinifolia features leaves that are attractively marked with white. It may grow to 30' tall.

Smooth-leaved Elm Foliage
These are the leaves of the American Elm, Ulmus americana.

 
 

Smooth-leaved Elm Bark
Bark

Smooth-leaved Elm - Ulmus carpinifolia 'Koopmanii', Morton Arboretum Acc. 465-72*1
Smooth-leaved Elm - Ulmus carpinifolia 'Koopmanii'

References
  1. Smooth-leaved Elm - Ulmus carpinifolia 'Wredei', Morton Arboretum Acc. 269-57-3 photographed 7-17-2010 by Bruce Marlin
  2. Smooth-leaved Elm - Ulmus carpinifolia 'Koopmanii', Morton Arboretum Acc. 465-72*1 photographed 10-4-2010 by Bruce Marlin

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