Located in upstate SC on dry site.
Howard,
your tree is a hawthorn, genus Crataegus. I am not sure which species it is, though your images are great. If I had to give it a name, I’d try Crataegus flabellata; also in the area is Crataegus flava. Both can grow in upland dryish woods. These relatives of the apple are notoriously difficult to identify, so other ideas are welcome! It does have some resemblance to Crataegus marshallii, but that one is from the bottomland woods of the lower piedmont and coastal plain, but the flower stalks would be pubescent as yours are.
–Dr. Steven R. Hill, Botanist, SCNPS