Ulmus thomasiiSarg.

cork elmrock elm

WFO wfo-0000416829 Accepted WFO 2026-06 8 photographs CC0 / CC BY / CC BY-SA

Plate 1 figs. a–h · 8 separate observations

Ulmus thomasii, photographed by Quinten Wiegersma
fig. a Quinten Wiegersma, CC BY 4.0 / 2021-08-23 / obs. 153082525
Ulmus thomasii, photographed by Henry "Nick" Robertson
fig. b Henry "Nick" Robertson, CC BY-SA 4.0 / obs. 144011153
Ulmus thomasii, photographed by Henry "Nick" Robertson
fig. c Henry "Nick" Robertson, CC BY-SA 4.0 / obs. 126830678
Ulmus thomasii, photographed by Jeff D Hansen
fig. d Jeff D Hansen, CC BY 4.0 / obs. 121431037
Ulmus thomasii, photographed by Randy A Nonenmacher
fig. e Randy A Nonenmacher, CC BY 4.0 / obs. 29699943
Ulmus thomasii, photographed by Étienne Léveillé-Bourret
fig. f Étienne Léveillé-Bourret, CC BY 4.0 / obs. 204020718
Ulmus thomasii, photographed by botany08
fig. g botany08, CC BY 4.0 / obs. 182259737
Ulmus thomasii, photographed by Étienne Lacroix-Carignan
fig. h Étienne Lacroix-Carignan, CC0 1.0 / obs. 156182114

Every figure is a research-grade observation under CC0, CC BY or CC BY-SA, rehosted with the photographer’s name, the licence and the observation it came from. Photographs under a NonCommercial licence are excluded from this site and are never stored, which costs us a great many pictures and is not negotiable.

Native range 20 botanical countries

Regions where Ulmus thomasii is native: Arkansas, Illinois, Indiana, Iowa, Kansas, Kentucky, Michigan, Minnesota, Missouri, Nebraska, New Hampshire, New Jersey, New York, Ohio, Ontario, South Dakota, Tennessee, Vermont, West Virginia, Wisconsin ArkansasIllinoisIndianaIowaKansasKentuckyMichiganMinnesotaMissouriNebraskaNew HampshireNew JerseyNew YorkOhioOntarioSouth DakotaTennesseeVermontWest VirginiaWisconsin
Native distribution of Ulmus thomasii, after Kew’s World Checklist of Vascular Plants. Introduced, extinct and doubtful records are excluded, so this is where the plant is from, not everywhere it now grows.
RegionTDWG codeContinent
Arkansas ARK NORTHERN AMERICA
Illinois ILL
Indiana INI
Iowa IOW
Kansas KAN
Kentucky KTY
Michigan MIC
Minnesota MIN
Missouri MSO
Nebraska NEB
New Hampshire NWH
New Jersey NWJ
New York NWY
Ohio OHI
Ontario ONT
South Dakota SDA
Tennessee TEN
Vermont VER
West Virginia WVA
Wisconsin WIS

Region boundaries approximated from Natural Earth (public domain) and mapped to TDWG World Geographical Scheme for Recording Plant Distributions (WGSRPD) level-3 botanical countries (Brummitt 2001). Indicative, not the official WGSRPD geometry.

Also published as 1 synonym

A synonym is not an error. It is a record of botanists disagreeing, in print, about where this plant belongs. Each of these was somebody’s considered answer.

  • Ulmus racemosa D.Thomas

Sourcesevery claim on this page

  1. World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
  2. iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
  3. Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. Retrieved 2026-07-13.
  4. Kew, World Checklist of Vascular Plants (WCVP v16). native distribution by TDWG level-3 botanical country, and life form. CC BY 3.0. Retrieved 2026-06-04.

We publish what we can source and we say so when we cannot. This page has no care advice and no toxicity claim, because we do not yet have those from a source we can cite.