Location is Middle Tennessee.

And any form of muscadine would be Vitis rotundifolia.

It is my understanding that both Vitis munsoniana and popenoei as well as rotundifolia are considered muscadines as well.

Vitus munsoniana is Vitis rotundifolia var. munsoniana. I'm not sure if it's been elevated to species? Vitus popenoei is a wild grape in Mexico, and tropical America that's not considered a muscadine itself, but it was crossed with V. rotundifolia to create the grape cultivar 'Southern Home' which is considered a muscadine grape.🍇

"The muscadine grape is native to the southeastern United States and was the first native grape species to be cultivated in North America. The natural range of muscadine grapes extends from Delaware to central Florida and occurs in all states along the Gulf Coast to east Texas. It also extends northward along the Mississippi River to Missouri. Muscadine grapes will perform well throughout Florida, although performance is poor in calcareous soils or in soils with very poor drainage. Most scientists divide the Vitis genus into two subgenera: Euvitis (the European, Vitis vinifera L. grapes and the American bunch grapes, Vitis labrusca L.) and the Muscadania grapes (muscadine grapes). There are three species within the Muscadania subgenera (Vitis munsoniana, Vitis popenoei and Vitis rotundifolia)."

Yes you are correct gardengal. I was in error stating that popenoei wasn't a muscadine. It is in the muscadine tribe.

Update: Vitis rotundifolia has been changed to Muscadinia rotundifolia, because it's a more basal clade than Vitis.😃

I was hoping they were Muscadine! My plant app was going back and forth between Muscadine, Riverbank, and Frost grape and all the photos seemed very similar (I know nothing about grapes).

Country people call them scuppernongs.

This is the new taxonomic treatment.

Muscadinia rotundifolia var rotundifolia

Muscadinia rotundifolia var munsoniana

Muscadinia rotundifolia var pygmaea

I believe the 2nd species Weakley refers to is Muscadinia popenoei.