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: Malvids: Malvales
American Basswood, Northern Basswood
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JK Marlow jkm0303y_10
March Greenville County SC
JK Marlow jkm0308o_21
August Greenville County SC
JK Marlow jkm150927_183
September Henderson County NC
Leaves on mature wood green and glabrous below, per Woody Plants of the Blue Ridge.
JK Marlow s101017_tamericana
October Mecklenburg County NC
Leaf bases unequally heart-shaped or nearly straight across, per Native Trees of the Southeast, An Identification Guide.