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)
Guide to the Vascular Plants of Florida (Wunderlin & Hansen, 2011)
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Roxanna Martin rlm31812_7
March Spartanburg County SC
Flowers unisexual, greenish, small, petals absent; staminate in fascicles, per Native Trees of the Southeast, An Identification Guide.
Terry Holdsclaw tdh_c_occidentalis_0087
April Catawba County NC
Bark gray to light brown, smooth with corky outgrowths, per Native Trees of the Southeast, An Identification Guide.
Richard and Teresa Ware rtw_celtis_occidentalis
Leaf blades mostly < 2x long as wide, 5-12cm long, toothed well below middle, per Weakley's Flora.