Dig deeper at SERNEC, a consortium of southeastern herbaria.
You may also want to check Trees, Shrubs, and Woody Vines of North Carolina
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Rosids: Fabids: Rosales
Manual of the Southeastern Flora (Small, 1933)
Slippery Elm, Red Elm
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Richard and Teresa Ware rtw_ulmus_rubra
Fruit a flat, nearly round samara, its tip slightly notched & wing hairless, per Native Trees of the Southeast, An Identification Guide.
JK Marlow jkm120414_914
April Pickens County SC
Leaf tips abruptly acuminate, leaf bases rounded to unequal, per Native Trees of the Southeast, An Identification Guide.
Ron Lance rwl_ulmus_rubra_bark
May Jackson County NC
Big Ridge Preserve
Bark light brown, with interlacing ridges, per Woody Plants of the Blue Ridge.
JK Marlow s070927_b
September Pickens County SC
Leaves mostly 4-6" long, doubly-toothed, sandpapery above, hairy below, per Woody Plants of the Blue Ridge.
Richard and Teresa Ware rtw_u_rubra_slipperytwig
Flower buds larger than vegetative buds, globular, rusty-woolly on top half, per Woody Plants of the Southeastern US: A Winter Guide.
Richard and Teresa Ware rtw_ulmus_rubra_3
Buds 5-6mm long, with 6 or more dark scales, rusty-hairy near tip, per Woody Plants of the Southeastern US: A Winter Guide.