BOTANIST- is there a botanist in the house? I need to know what kind of chestnut tree this is

I took hundreds of photos of the buds of these chestnuts which grow wild as underbrush in the glen by the creeks (see most recent Ambrose romp video.)

I know its chestnut

I know it doesn't produce edible nuts

I know it grows wild as a weedy underbrush in Indiana.

But I don't know what kind it is, and as I'd like to do a slideshow from first bud to this point, it'd be really nice to know and be able to label/tag it appropriately.

DANKE!