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Ulmus serotina
''Ulmus serotina'' Sarg., the September elm, is an
American species uncommon beyond Tennessee; only very locally distributed through Illinois, Kentucky, Arkansas, Mississippi, Oklahoma, Alabama and Georgia, growing predominantly on limestone bluffs and along streams to elevations of 400 m.〔Duncan, W. H., & Duncan, M. B. (2000). ''Trees of the Southeastern United States'', 234–238. Athens, Georgia, USA. ISBN 0-8203-2271-7〕 The tree is also endemic to Nuevo León in Mexico 〔Todzia, C. A. & Panero, J. L. (2006). A new species of Ulmus (Ulmaceae) from southern Mexico and a synopsis of the species in Mexico. ''Brittonia'', Vol 50, (3): 346〕 ().
==Description==
Rarely exceeding 20 m in height, the tree has a rounded crown with spreading to pendulous branches. The glabrous young shoots become progressively corky-winged with age, and bear oblong to obovate leaves <8 cm long. The wind-pollinated apetalous perfect flowers form pendulous racemes which open in September and serve to distinguish the species from its compatriot, the cedar elm ''U. crassifolia'', with which it readily hybridizes. The samarae are oblong-elliptical, 10–15 mm in length, deeply divided at the apex, and ripen in November ()
().
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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