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. The tree is also endemic to Nuevo León in Mexico  .
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 mm to 15 mm in length, deeply divided at the apex, and ripen in November  .
Pests and diseases
The species is highly susceptible to Dutch elm disease.
Before the outbreak of Dutch elm disease, U. serotina enjoyed limited popularity as a shade-tree in the southern part of its range. The tree grows well on most soils but is intolerant of anaerobic or saline conditions; it is also frost-tolerant to - 30°C. (-23 F). The September Elm is very rare in cultivation in Europe, and it is not known to have been introduced to Australasia. There are no known cultivars of this taxon, nor is it known to be in commerce.
- Ulmus × arkansana
- North America
- Mildred E. Mathias Botanical Garden, UCLA, Los Angeles, California. (No details available)
- Morton Arboretum. Acc. no. 1039-23.
- U S National Arboretum , Washington, D.C., USA. Acc. no. 55431.
- Royal Botanic Garden Edinburgh, UK. Acc. no. 20080091, from seed wild collected in USA.
- Royal Botanic Gardens, Wakehurst Place, UK. Acc. no. 2006-143.
- Sir Harold Hillier Gardens, UK. Acc. no. 2004.1059, 3 small trees, collected in Tennessee, 2004.
- Thenford House arboretum, Banbury, UK. (No details available).
- University of Copenhagen, Botanic Garden, Denmark. (No details available)
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- Duncan, W. H., & Duncan, M. B. (2000) Trees of the Southeastern United States, pp. 234 - 238. Athens, Georgia, USA. ISBN 0-8203-2271-7
- 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
- Bean, W. J. (1981). Trees and shrubs hardy in Great Britain, 7th edition. Murray, London.