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{{SPlantbox

{{SPlantbox

|familia=Ulmaceae

|familia=Ulmaceae

|genus=Ulmus  

|genus=Ulmus

|species=thomasii

|species=thomasii

|common_name=Cork Elm, Rock Elm

|common_name=Cork Elm, Rock Elm

|Max wd metric=ft

|Max wd metric=ft

|width_ref=Flora - A Gardener's Encyclopedia

|width_ref=Flora - A Gardener's Encyclopedia

|exposure=sun

|exposure=sun

|sun_ref=Flora - A Gardener's Encyclopedia

|sun_ref=Flora - A Gardener's Encyclopedia

|image_width=240

|image_width=240

}}

}}

'''''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.

| latin_name = ''LATINNAME''   <!--- replace LATINNAME with the actual latin name -->

 

| common_names =    <!--- if multiple, list all, if none, leave blank -->

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.

| growth_habit = ?  <!--- tree, shrub, herbaceous, vine, etc -->

 

| high = ?  <!--- 1m (3 ft) -->

The [[leaf|leaves]] are 5 - 10 cm long and 2 - 5 cm wide, [[leaf shape|oval]] to [[leaf shape|obovate]] with a round, symmetrical base and acuminate apex. The leaf surface is shiny dark green, turning bright yellow in autumn; the  underside is pubescent. The [[perfect flower|perfect]] [[apetalous]], wind pollinated [[flower]]s are red-green and appear in racemes < 40 mm long two weeks before the leaves from March to May, depending on the tree's location. The [[fruit]] is a broad ovate [[Samara (fruit)|samara]] 13 - 25 mm long covered with fine hair, notched at the tip, and maturing during May or June to form drooping clusters at the leaf bases. <ref name=White>White, J & More, D. (2003). ''Trees of Britain & Northern Europe''. Cassell's, London.</ref>.

| wide =     <!--- 65cm (25 inches) -->

 

| origin = ?  <!--- Mexico, S America, S Europe, garden, etc -->

| poisonous =     <!--- indicate parts of plants which are known/thought to be poisonous -->

| lifespan =    <!--- perennial, annual, etc -->

| exposure = ?  <!--- full sun, part-sun, semi-shade, shade, indoors, bright filtered (you may list more than 1) -->

| water = ?  <!--- frequent, regular, moderate, drought tolerant, let dry then soak -->

| features =    <!--- flowers, fragrance, fruit, naturalizes, invasive -->

| hardiness =    <!--- frost sensitive, hardy, 5°C (40°F), etc -->

| bloom =    <!--- seasons which the plant blooms, if it is grown for its flowers -->

| usda_zones = ?  <!--- eg. 8-11 -->

| sunset_zones =    <!--- eg. 8, 9, 12-24, not available -->

| image = Upload.png  <!--- Freesia.jpg -->

| image_width = 240px    <!--- leave as 240px if horizontal orientation photo, or change to 180px if vertical -->

| image_caption =    <!--- eg. Cultivated freesias -->

| familia =    <!--- Family -->

{{Inc|

{{Inc|

Ulmus racemosa, Thomas, not Borkh. (U. Thomasii, Sarg.). Cork Elm. Rock Elm. Tree, attaining 100 ft., with short spreading branches, forming an oblong round-topped head: branchlets pubescent usually until the second year and mostly irregularly corky winged when older: buds acute, pubescent: lvs. oval to oblong-obovate, unequal at the base, shortly acuminate, sharply and doubly serrate, glabrous or somewhat rough above, pubescent beneath, 2-4 in. long: fls. in slender pendulous racemes; calyx with 5-8 exserted stamens: fr. oval or obovate, with a shallow notch at the apex, pale, pubescent, 1/2 – 3/4 in. long. Que. to Tenn., west to Neb.  

Ulmus racemosa, Thomas, not Borkh. (U. Thomasii, Sarg.). Cork Elm. Rock Elm. Tree, attaining 100 ft., with short spreading branches, forming an oblong round-topped head: branchlets pubescent usually until the second year and mostly irregularly corky winged when older: buds acute, pubescent: lvs. oval to oblong-obovate, unequal at the base, shortly acuminate, sharply and doubly serrate, glabrous or somewhat rough above, pubescent beneath, 2-4 in. long: fls. in slender pendulous racemes; calyx with 5-8 exserted stamens: fr. oval or obovate, with a shallow notch at the apex, pale, pubescent, 1/2 – 3/4 in. long. Que. to Tenn., west to Neb.  

}}

}}

==Cultivation==

==Cultivation==

 

===Propagation===

===Propagation===

 

===Pests and diseases===

===Pests and diseases===

{{edit-pests}}<!--- Type pest/disease info below this line, then delete this entire line -->

Like most North American elms, the Rock Elm is very susceptible to [[Dutch elm disease]].

 

==Gallery==

==Gallery==

<gallery>

<gallery perrow=5>

Image:Upload.png| photo 1

Image:Upload.png| photo 1

Image:Upload.png| photo 2

Image:Upload.png| photo 2

==References==

==References==

<!--- xxxxx  *Flora: The Gardener's Bible, by Sean Hogan. Global Book Publishing, 2003. ISBN 0881925381  -->

<!--- xxxxx  *Flora: The Gardener's Bible, by Sean Hogan. Global Book Publishing, 2003. ISBN 0881925381  -->

<!--- xxxxx  *American Horticultural Society: A-Z Encyclopedia of Garden Plants, by Christopher Brickell, Judith D. Zuk. 1996. ISBN 0789419432  -->

<!--- xxxxx  *American Horticultural Society: A-Z Encyclopedia of Garden Plants, by Christopher Brickell, Judith D. Zuk. 1996. ISBN 0789419432  -->

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