Ulmus chenmoui
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 Chenmoui foliage
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| Ulmus chenmoui Cheng |
Ulmus chenmoui is a small deciduous tree from the provinces of Anhui and Jiangsu in eastern China, where it is found at elevations below 200 m. Growing to a maximum height of 20 m, its slender trunk rarely exceeds 0.5 m in diameter at breast height [d.b.h.]; the bark exfoliates in irregular flakes. Its wing-less twigs bear comparatively large obovate to oblong leaves up to 18 cm in length [1]. The wind-pollinated petal-less flowers are produced on second-year shoots in March; the samarae are obovate < 25 mm long by 17 mm wide and ripen in April.
The tree is rare in cultivation in the West, but was evaluated by Mittempergher in Italy, who found it to have a low susceptibility to Dutch elm disease and elm leaf beetle. It also featured in elm trials conducted by the Institut Nationale de la Recherche Agronomique (INRA) on gravelly soils in the Bois de Vincennes, Paris, but most specimens were killed by drought. A tree at the Sir Harold Hillier Gardens in Hampshire, England, survives in an open location on London Clay. Planted in 1993, it was 7m high with a trunk 14 cm d.b.h. (diameter at breast height) in 2005. In the USA, the tree is grown at the Denver Botanic Gardens.
U. chenmoui is now considered rare and endangered in its native China.
[edit] References
- 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. [2]
