''Ulmus elongata'', also known as the long raceme elm in the US, is a

deciduous In the fields of horticulture and Botany, the term ''deciduous'' () means "falling off at maturity" and "tending to fall off", in reference to trees and shrubs that seasonally shed leaves, usually in the autumn; to the shedding of petals, ...

tree

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found else ...

to broadleaf forests in the eastern provinces of China.

Description

The tree grows to a height of < 30 m and trunk < 0.8 m d.b.h. The bark is a brownish grey, and exfoliates in flakes. The coarse leaves are < 20 cm long, narrowly elliptic with an acuminate apex and borne on twigs that occasionally feature corky wings. The wind-pollinated

apetalous Petals are modified leaves that surround the reproductive parts of flowers. They are often brightly colored or unusually shaped to attract pollinators. All of the petals of a flower are collectively known as the ''corolla''. Petals are usually ...

flowers appear on the second-year twigs in February. The samarae are distinctively shuttle-shaped, < 25 mm in length, on stalks < 22 mm long, and appear in March.Fu, L. & Jin, J. (eds). (1992). ''China Red Data Book. Rare and endangered plants. Vol. 1''. Science Press, Beijing.Fu, L., Xin, Y. & Whittemore, A. (2002). Ulmaceae, in Wu, Z. & Raven, P. (eds) ''Flora of China'', Vol. 5 (Ulmaceae through Basellaceae). Science Press, Beijing, and Missouri Botanical Garden Press, St. Louis, USA.

/ref> File:4-7_year_old_Ulmus_elongata.JPG, Emergent leaves of ''U. elongata'' File:The branches of ULMUS ELONGATA in Gutianshan.JPG, Branches of ''U. elongata'' at Gutianshan, China.

Pests and diseases

No information available.

Cultivation

The species was virtually unknown in the West until it was introduced to the

Morton Arboretum The Morton Arboretum, in Lisle, Illinois, United States, is a public garden, and outdoor museum with a library, herbarium, and program in tree research including the Center for Tree Science. Its grounds, covering 1,700 acres (6.9 square kilometres ...

Illinois Illinois ( ) is a state in the Midwestern United States. Its largest metropolitan areas include the Chicago metropolitan area, and the Metro East section, of Greater St. Louis. Other smaller metropolitan areas include, Peoria and Rockf ...

, in the 1990s as part of an evaluation of Chinese elms for landscape use.Ware, G. (1995). Little-known elms from China: landscape tree possibilities. ''Journal of Arboriculture'', (Nov. 1995). International Society of Arboriculture, Champaign, Illinois, US.
Some of the seedlings raised at the Morton Arboretum were donated to the United States National Arboretum, U S National Arboretum (USNA) in

Washington Washington commonly refers to: * Washington (state), United States * Washington, D.C., the capital of the United States ** A metonym for the federal government of the United States ** Washington metropolitan area, the metropolitan area centered o ...

, where two have prospered. The species is not known (2018) in Europe or Australasia. ''U. elongata'' is not known to be in commerce, and there are no known

cultivar A cultivar is a type of cultivated plant that people have selected for desired traits and when propagated retain those traits. Methods used to propagate cultivars include: division, root and stem cuttings, offsets, grafting, tissue culture ...

Accessions

North America

*United States National Arboretum, Washington, D.C., US. Two trees, germinated at the Morton Arboretum from seed sent from China. Acc. nos. 68995, 55393. * Morton Arboretum, US. Two clonally propagated trees. Acc. no. 196-2011

References

* Gao, J. G., G. D. Xu, and W. Q. Li. "Qiu z J, Liu P. Preliminary studies on photosynthetic characteristics of endangered plant Ulmus elongata seedlings." Ecology and Environment Sciences 20.1 (2011): 66–71. * Jiang, Yan-sheng. "The Study on Natural Regeneration of Ulmus elongata " Journal of Fujian Forestry Science and Technology 4 (2003). * Lai, W. (2001). The Height Growth of Ulmus elongata Seedlings and Its Correlations with Climatic Factors. ''Journal of Fujian College of Forestry 2001-02''. * Lai, W. S. "Study on annual growth dynamics of one-year-old seedlings for Ulmus elongata." Journal of Nanjing Forestry University: Natural Science Edition 25.4 (2001): 57–60. * Lai, W., G. Zou, and J. Zhang. "Influence of the different densities on the growth of Ulmus elongata seedlings, J." Fujian For. Sci. Technol 28.2 (2001): 74–80. * Lai, W. S. "The study on cuttings propagation of Ulmus elongata." China Forestry Science and Technology 14.6 (2000): 32–33. * Tian, Y., et al. "The studies on reproductive characteristics of Ulmus elongata." Journal of Hebei Forestry University 11.S1 (1996): 25–29. * Zhang, J., Chen, Q., Lai, W. (1993). Studies on the Growth Rhythm of Ulmus elongata seedlings. ''Journal of Fujian Forestry Science and Technology 1993–03''.

External links

An introduction of Ulmus elongata (长序榆简介)
{{Taxonbar, from=Q2109850 elongata Trees of China Flora of China Trees of Asia Vulnerable plants Ulmus articles with images Elm species and varieties