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Ulmus pseudopropinqua
''Ulmus pseudopropinqua'' Wang & Li, occasionally known in the USA as the Harbin Spring Elm, is a small deciduous tree found only in Heilongjiang, the northeasternmost province in China. 〔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. ()〕 The tree has not been studied comprehensively, and it has been speculated it may be a natural hybrid of ''Ulmus davidiana'' var. ''japonica'' and ''Ulmus macrocarpa''. 〔Liou, T. N. (Ed.) (1955). ''Illustrated flora of the ligneous plants of north east China''. Academic Press, Beijing. (in Chinese)〕
==Description==
Regarded as a handsome tree, ''U. pseudopropinqua'' grows to a height of 10 m. The wing-less twigs bear small ovate to subovate dark-green leaves, < 5.5 cm long by 2.5 cm broad considered similar to those ''U. davidiana'' var. ''japonica''. 〔 The wind-pollinated apetalous flowers are produced on second-year shoots in April; the variably-shaped samarae < 25 mm long by 20 mm wide ripen in June.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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