Ulmus thomasii Sarg.
Rock elm, Cork elm
Ulmaceae (Elm Family)
Synonym(s): Ulmus racemosa
USDA Symbol: ULTH
Tree with usually straight trunk and narrow, cylindrical crown of short, drooping branches.
The valuable wood is hard, tough, and difficult to split, making it particularly suitable for agricultural implements and tool handles. In the 19th century, this durable timber was exported to England for construction of wooden battleships and sailing vessels.
From the Image Gallery
Plant CharacteristicsDuration: Perennial
Leaf Retention: Deciduous
Leaf Arrangement: Alternate
Leaf Complexity: Simple
Leaf Shape: Oblong , Obovate , Oval
Leaf Venation: Pinnate
Leaf Margin: Double-serrate
Leaf Apex: Acuminate
Leaf Base: Oblique
Fruit Type: Samara
Autumn Foliage: yes
Size Class: 72-100 ft.
Bloom InformationBloom Color: Yellow , Green , Brown
Bloom Time: Mar , Apr
DistributionUSA: AR , CT , IA , IL , IN , KS , KY , MA , MD , MI , MN , MO , ND , NE , NJ , NY , OH , PA , SD , TN , VT , WI , WV
Canada: ON , QC
Native Distribution: S. Ontario, extreme S. Quebec, and W. New England south to Tennessee, west to extreme NE. Kansas, and north to Minnesota; at 200-2500 (61-762 m).
Native Habitat: Moist to dry uplands, especially rocky ridges and limestone bluffs, also flatlands; in hardwood forests.
Growing ConditionsWater Use: High
Light Requirement: Sun , Part Shade , Shade
Soil Moisture: Dry , Moist
Soil pH: Alkaline (pH>7.2)
CaCO3 Tolerance: High
Soil Description: Clay
BenefitUse Wildlife: Birds, Other Showy Insects
Attracts: Birds , Butterflies
Larval Host: Mourning Cloak, Columbia silkmoth
Butterflies and Moths of North America (BAMONA)Ulmus thomasii is a larval host and/or nectar source for:
Learn more at BAMONA
Columbia silkmoth |
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National Wetland Indicator Status
BibliographyBibref 1186 - Field Guide to Moths of Eastern North America (2005) Covell, C.V., Jr.
Bibref 1185 - Field Guide to Western Butterflies (Peterson Field Guides) (1999) Opler, P.A. and A.B. Wright
Search More Titles in Bibliography
Additional resourcesUSDA: Find Ulmus thomasii in USDA Plants
FNA: Find Ulmus thomasii in the Flora of North America (if available)
Google: Search Google for Ulmus thomasii
MetadataRecord Modified: 2013-06-27
Research By: TWC Staff