Dig deeper at SERNEC, a consortium of southeastern herbaria.
You may also want to check Trees, Shrubs, and Woody Vines of North Carolina
Read more about Slippery Elm at Vascular Plants 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.