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'''''Ulmus thomasii''''' <small>Sarg.</small>, the '''Rock Elm''' or '''Cork Elm''', is a [[deciduous]] tree native primarily to the [[Midwestern]] [[United States]]. The tree ranges from southern [[Ontario]] and [[Quebec]], south to [[Tennessee]], west to northeastern [[Kansas]], and north to [[Minnesota]].<ref> {{cite web | url = http://esp.cr.usgs.gov/data/atlas/little/ulmuthom.pdf | title = "Ulmus Thomasii Range Map" | accessdate = 2008-03-02 | publisher = [[United States Geological Survey]]}} </ref> Its preferred habitat is moist but well-drained sandy loam, loam, or silt loam soil, mixed with other [[hardwood]]s; it is moderately shade-tolerant [http://forestry.about.com/library/silvics/blsilulmtho.htm]. However, it also grows on dry uplands, especially on rocky ridges and [[limestone]] bluffs.

'''''Ulmus thomasii''''' <small>Sarg.</small>, the '''Rock Elm''' or '''Cork Elm''', is a [[deciduous]] tree native primarily to the [[Midwestern]] [[United States]]. The tree ranges from southern [[Ontario]] and [[Quebec]], south to [[Tennessee]], west to northeastern [[Kansas]], and north to [[Minnesota]].<ref>http://esp.cr.usgs.gov/data/atlas/little/ulmuthom.pdf</ref> Its preferred habitat is moist but well-drained sandy loam, loam, or silt loam soil, mixed with other [[hardwood]]s; it is moderately shade-tolerant [http://forestry.about.com/library/silvics/blsilulmtho.htm]. However, it also grows on dry uplands, especially on rocky ridges and [[limestone]] bluffs.

The tree grows from 15-30 m tall and may live up to 300 years. Where forest-grown, the crown is cylindrical and upright with short branches, and is narrower than most other elms. Rock Elm is also unusual among elms in that it usually has a [[monopodial]] growth habit. <ref name=Bean> Bean, W. J. (1981). ''Trees and shrubs hardy in Great Britain'', 7th edition. Murray, London. </ref>. The [[bark]] is grey-brown and deeply furrowed into scaly, flattened ridges. Many older branches have 3-4 irregular thick corky wings. It is for this reason the Rock Elm is sometimes called the Cork Elm.  

The tree grows from 15-30 m tall and may live up to 300 years. Where forest-grown, the crown is cylindrical and upright with short branches, and is narrower than most other elms. Rock Elm is also unusual among elms in that it usually has a [[monopodial]] growth habit. <ref name=Bean> Bean, W. J. (1981). ''Trees and shrubs hardy in Great Britain'', 7th edition. Murray, London. </ref>. The [[bark]] is grey-brown and deeply furrowed into scaly, flattened ridges. Many older branches have 3-4 irregular thick corky wings. It is for this reason the Rock Elm is sometimes called the Cork Elm.