Cedar Elm - Ulmus crassifolia Nutt.
Family Ulmaceae - Zelkovas, Hackberries and Elms

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Cedar elm is the only fall-flowering and fruiting elm in North America [2]
Once a very popular and long-lived (300+ years) shade and street tree, American Elm suffered a dramatic decline in the 1950's with the infestation of Dutch elm disease, a fungus spread by a bark beetle. The wood of American Elm is very hard and was a valuable timber tree used for lumber, furniture and veneer. The Indians once made canoes out of American Elm trunks, and early settlers would steam the wood so it could be bent to make barrels and wheel hoops. It was also used for the rockers on rocking chairs.
Cedar Elm Foliage
The leaves of cedar elm are much thicker than other elms. This condition is known as "crassifoliate" - hence the species epithet. [2]
The Morton Arboretum, at Lisle, Illinois, is home to the largest Elm collection in North America. Under study, the collection includes almost all of the 22 Elm species native to China, a dozen of which show resistance to Dutch elm disease and elm yellows. The Arboretum in past years has bred and marketed five new elm varieties resistant to Dutch elm disease.

The 12 species being studied are: the Bergmann (Ulmus bergmanniana), Taihang Mountain (U. taihangshanensis), Tibetan (U. microcarpa), Anhui (U. gaussenii), Hebei (U. lamellosa), Harbin (U. harbinensis), corkbark (U. propinqua var. suberosa), plum-leaved (U. prunifolia), Chenmou (Ulmus chenmoui), Gansu (Ulmus glaucescens var. lasiocarpa), chestnut-leaved (U. castaneifolia) and Father David (U. davidiana var. mandshurica) elms.

These 12 Chinese trees are virtually unknown in the U.S., but are under close study at the arboretum. Dendrologist Emeritus and former research director Dr. George Ware, and Arboretum Assistant Director of Collections Kunso Kim are responsible for their observation and data collection. Their efforts may help ameliorate the effects of numerous maladies affecting trees around the world, such as Emerald Ash Borer, Oak wilt, Asian Longhorned Beetle, Pine Sawyer Beetle, et al.

"These and other problems underscore the urgent need for the Arboretum and others to continue seeking new species for urban use," Kim says. The average lifespan of an urban tree is fewer than 10 years, according to Ware. But planting hardier trees increases the likelihood of a longer life span and a greener world - a goal that has never been more important than now, with climate change upon us. [2]

Cedar Elm - Ulmus crassifolia Nutt.
Flower: Monoecious; small, in drooping clusters of 3 to 5, appear in early spring before leaf buds open.

Fruit: Rounded, flat, pappery, wafer-like samaras, 3/8 to 1/2 inch across, deeply notched at apex, hairless except for margin; ripen in spring. Twig: Slender, glabrous, slightly zigzag, reddish brown; buds ovate, over 1/4 inch long, reddish brown with darker edged scales, often placed a little to one side of the twig.

References
  1. Hybrid Elm, Morton Arboretum acc. 1946-24*1, photographed May 6, 2010 by Bruce Marlin
  2. The Morton Arboretum, Arboretum Records Honor, Milestone; Looks to Future, http://www.mortonarb.org/res/GEORGEWARE.pdf
  3. The University of Texas at Austin, BIO 406D Native Plants of Central Texas
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Family Ulmaceae - Zelkovas, Hackberries and Elms
There are about 200 species of trees and shrubs in Ulmaceae. 14 trees and 2 shrubs are native to North America. Elms fell victim to Dutch Elm disease during the 1950's; until that time, they were the premier shade tree along the streets of our American towns and cities.
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