Ulmus thomasii Sargent. Subgenus: Oreoptelea. Section: Chaetoptelea. Cork Elm, Rock Elm. Phen: Mar-May. Hab: Mesic upland and riparian forests, shaded bluffs, especially over limestone. Dist: QC to MN and NE, south to NJ, MD, WV, KY, TN, AR, and KS.

Origin/Endemic status: Native

Synonymy: = Ar, C, FNA3, Il, K1, K3, K4, Mi, NE, NY, Tn; = n/a – Pa; = Ulmus thomasi – F, G, GrPl, WV, orthographic variant

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: FAC
• Eastern Mountains and Piedmont: FACU
• Great Plains: FACU
• Midwest: FAC
• Northcentral & Northeast: FAC

Heliophily: 5