Looks like Small-flowered Buttercup (Ranunculus abortivus)

I wonder if it could be Common Camphorweed (Heterotheca latifolia)? Have a look at the link below for comparison photos. If you don't think it's CC, you can also try the web site's search function using plant description... Name That Plant is a great web site for identifying plants found in the Carolinas... Here is a link that might be useful: Info on Common Camphorweed

They could be either False Oxlips, a hybrid between P veris and P vulgaris, which occurs quite often, or true Oxlips, Primula elatior. The bluebells, I believe, are Spanish bluebells, judging by the colour and the way the flowers are held. Here is a link that might be useful: True Oxlips.

One of the "crowfoot family" woodland buttercups (Ranunculaceae)?