The scuppernong is a large variety of muscadine

Muscadine

Muscadines are a grapevine species native to the present-day southeastern United States that has been extensively cultivated since the 16th Century. It differs from Vitis spp. in its number of chromosomes and its morphology...

 (Vitis rotundifolia), a species of grape

Grape

A grape is a non-climacteric fruit, specifically a berry, that grows on the perennial and deciduous woody vines of the genus Vitis. Grapes can be eaten raw or they can be used for making jam, juice, jelly, vinegar, wine, grape seed extracts, raisins, molasses and grape seed oil. Grapes are also...

 native to the southeastern United States. It is usually a greenish or bronze color and is similar in appearance and texture to a white grape, but rounder and larger and first known as the 'big white grape'. The grape is commonly known as the "scuplin" in some areas of the Deep South. It is also known as the "scupanon", "scupadine" or "scufadine" in some parts of the South.
The name comes from the Scuppernong River

Scuppernong River (North Carolina)

The Scuppernong River is a blackwater river that flows through Tyrrell County and Washington County, North Carolina into the Albemarle Sound. It is a tributary of the Pasquotank River Basin...

 in North Carolina

North Carolina

North Carolina is a state located in the southeastern United States. The state borders South Carolina and Georgia to the south, Tennessee to the west and Virginia to the north. North Carolina contains 100 counties. Its capital is Raleigh, and its largest city is Charlotte...

 mainly along the coastal plain.