Ulmus szechuanica

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Ulmus szechuanica
SHHG Ulmus szechuanica.jpg
Ulmus szechuanica, Sir Harold Hillier Gardens
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Rosales
Family: Ulmaceae
Genus: Ulmus
Species: U. szechuanica
Binomial name
Ulmus szechuanica
Fang
Synonyms

Ulmus szechuanica Fang, known as the Szechuan (Sichuan), or Red-fruited, Elm, is a small to medium deciduous Chinese tree found along the Yangtze river through the provinces of Sichuan, Jiangxi, Anhui, and Jiangsu.

Description[edit]

Szechuanica leaves.jpg

The tree can reach a height of 18 m, but is usually less than 10 m, with a spreading umbrella-like crown. The leaves, dark red on emergence, are generally obovate < 9 cm long by 5 cm broad, borne on branchlets with an irregular corky layer. The wind-pollinated apetalous flowers are produced on second-year shoots in February, followed in March by suborbicular samarae < 16 mm long by 13 mm wide.[1][2]

Pests and diseases[edit]

U. szechuanica was evaluated with other Chinese elms at the Morton Arboretum, Illinois, where it exhibited a resistance to Dutch elm disease. The species is eschewed by the Elm Leaf Beetle Xanthogaleruca luteola [3] [3].

Cultivation[edit]

Growing best on well-drained soils, U. szechuanica is cold hardy; in artificial freezing tests at the Morton Arboretum [4] the LT50 (temp. at which 50% of tissues die) was found to be −30 °C. However, it was also found to be comparatively weak-wooded, making it susceptible to storm damage in winter.[5] There are no known cultivars of this taxon, nor is it known to be in commerce beyond the United States.

Hybrid cultivars[edit]

U. szechuanica is believed to have been used in post-2000 hybridization experiments at the Morton Arboretum.[6]

Accessions[edit]

North America
Europe

Nurseries[edit]

North America
Europe

References[edit]

  1. ^ Fu, L. & Jin J. (eds). (1992). China Red Data Book. Rare and endangered plants. Vol. 1. Science Press, Beijing.
  2. ^ 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. [1]
  3. ^ Miller, F. & Ware, G. (1884). Preference for and Suitability of Selected Elms Ulmus spp. and their Hybrids for the Elm Leaf Beetle, (Pyrrhalta luteola Coleoptera: Chrysomelidae). Journal of Environmental Horticulture. 12(4):231 - 235. December 1994.
  4. ^ Shirazi, A. M. & Ware, G. H. (2004). Evaluation of New Elms from China for Cold Hardiness in Northern Latitudes. International Symposium on Asian Plant Diversity & Systematics 2004, Sakura, Japan.
  5. ^ Ware, G. (1995). Little-known elms from China: landscape tree possibilities. Journal of Arboriculture, (Nov. 1995). International Society of Arboriculture, Champaign, Illinois, USA. [2]
  6. ^ Mittempergher, L. & Santini, A. (2004). Elm breeding history. Invest Agrar: Sist Recur For, (2004), 13 (1), 161-177.
  7. ^ "List of plants in the {elm} collection". Brighton & Hove City Council. Retrieved 23 September 2016.